TEST 3
BIOS 252 - Anatomy & Physiology II with Lab
Comprehensive Study Guide Review
100 Questions | 100% Correct | Grade A Verified
EXAM OVERVIEW
Institution: Chamberlain University
Course: BIOS 252 - Anatomy & Physiology II with Lab
Examination: Test 3 - Comprehensive Review
Edition: Latest Update
Total Questions: 100 (Multiple Choice, Single Best Answer)
Sections: 6 (Reproductive, Embryology, Fluids/Electrolytes,
Senses, Nervous System, Clinical Integration)
Cognitive Distribution: 30% Recall | 50% Application | 20% Analysis
EXAM INSTRUCTIONS
1. This examination contains 100 multiple-choice questions divided into six content sections.
2. Each question has four answer choices (A, B, C, D). Select the SINGLE BEST answer.
3. Cognitive levels: 30% recall, 50% application, 20% analysis - aligned with Chamberlain
University BIOS 252 Test 3 blueprint for the 2026/2027 academic cycle.
4. Each question is followed by the verified correct answer and a comprehensive rationale
explaining the anatomy and physiology reasoning and why distractors are incorrect.
5. Sections cover: Reproductive System; Development, Heredity & Embryology; Fluid,
Electrolyte & Acid-Base Balance; General & Special Senses; Nervous System (ANS & CNS);
and Integrated Clinical Scenarios with Lab Applications.
6. Recommended completion time: 150 minutes. Aim for 80% or higher for Grade A performance.
Chamberlain University | BIOS 252 Anatomy & Physiology II with Lab | Test 3 Study Guide
,BIOS 252 - Anatomy & Physiology II with Lab | Test 3 Study Guide | Chamberlain University 2026/2027 Edition
SECTION 1: REPRODUCTIVE SYSTEM
Questions 1-30 cover male and female reproductive anatomy, hormonal regulation, the ovarian and menstrual cycles, and
pregnancy/lactation physiology.
Q1. A 24-year-old male presents for fertility evaluation. Semen analysis shows a sperm count within normal
limits, but sperm motility is markedly reduced. The physician explains that sperm acquire motility and the
capacity to fertilize an oocyte during their transit through which of the following structures?
A. Epididymis [CORRECT]
B. Vas deferens
C. Rete testis
D. Seminal vesicles
Correct Answer: A
Rationale: Sperm leaving the seminiferous tubules are nonmotile and structurally immature; they gain motility and fertilizing
capacity during their 2-3 week passage through the epididymis, where fluid is resorbed and surface glycoproteins are
remodeled. The vas deferens is a transport conduit only, the rete testis collects sperm from the seminiferous tubules, and the
seminal vesicles contribute fructose-rich fluid but do not mature sperm.
Q2. Which physiologic mechanism maintains the testes 2-3 degrees Celsius below core body temperature,
an essential condition for viable spermatogenesis?
A. Countercurrent heat exchange in the spermatic cord and contraction/relaxation of the dartos and
cremaster muscles [CORRECT]
B. Active secretion of cool fluid by the seminal vesicles surrounding the testes
C. High metabolic rate of Leydig cells generating a thermal gradient
D. Direct parasympathetic vasodilation of the testicular artery only
Correct Answer: A
Rationale: The scrotal temperature is regulated by the dartos muscle (subcutaneous, smooth muscle that wrinkles scrotal skin
to reduce heat loss when cold) and the cremaster muscle (skeletal muscle that raises or lowers the testes). The pampiniform
plexus provides countercurrent heat exchange between warm arterial blood and cooler venous return. The other options
describe nonexistent or incorrect mechanisms; Leydig cells produce testosterone, not a cooling gradient.
Q3. In the male reproductive tract, the bulbourethral (Cowper's) glands secrete a clear, mucus-like fluid
that is released prior to ejaculation. What is the primary physiologic purpose of this secretion?
A. To neutralize residual acidic urine in the urethra and provide lubrication [CORRECT]
B. To supply fructose as an energy substrate for sperm
C. To deliver clotting factors that coagulate semen after deposition
D. To supply alkaline phosphatase that activates sperm capacitation
Correct Answer: A
Rationale: Bulbourethral glands secrete a viscous mucus rich in galactose and sialoprotein that lubricates the glans and
neutralizes residual acidic urine within the spongy urethra, creating a hospitable environment for sperm transit. Fructose is
contributed by the seminal vesicles, clotting factors (semenogelin) come from the seminal vesicles to form the coagulum, and
alkaline phosphatase is a prostate secretion.
Grade A Study Guide | 100% Verified Answers Page 2
,BIOS 252 - Anatomy & Physiology II with Lab | Test 3 Study Guide | Chamberlain University 2026/2027 Edition
Q4. A 19-year-old male asks why semen has an alkaline pH. The correct physiologic explanation is that the
alkaline environment is necessary to:
A. Buffer the acidic environment of the vagina (pH ~3.5-4.5) and protect sperm DNA [CORRECT]
B. Activate the acrosomal reaction before fertilization
C. Trigger capacitation in the epididymis
D. Prevent premature motility loss in the testes
Correct Answer: A
Rationale: Semen pH of 7.2-7.6, primarily established by alkaline prostatic secretions and seminal vesicle fluid, buffers the
normally acidic vaginal environment (pH 3.5-4.5 due to lactobacilli) that would otherwise immobilize sperm and damage
DNA. The acrosomal reaction occurs after capacitation in the female tract, capacitation occurs in the female reproductive
tract (not epididymis), and pH regulation in the testes is unrelated to semen alkalinity.
Q5. Hormonal regulation of spermatogenesis involves a negative feedback loop. Testosterone produced by
Leydig cells directly inhibits which of the following?
A. GnRH release from the hypothalamus and LH secretion from the anterior pituitary [CORRECT]
B. FSH secretion only, with no effect on LH
C. Inhibin release from Sertoli cells only
D. Release of progesterone from Sertoli cells
Correct Answer: A
Rationale: Testosterone, secreted by Leydig cells under LH stimulation, exerts negative feedback on the hypothalamus
(decreasing GnRH) and on the anterior pituitary (decreasing LH), maintaining stable circulating testosterone. Inhibin,
secreted by Sertoli cells under FSH stimulation, specifically inhibits FSH. Testosterone does not directly stimulate inhibin,
and Sertoli cells do not produce progesterone in physiologic quantities.
Q6. A patient is administered a drug that selectively blocks FSH receptors on Sertoli cells. Which cellular
process would be most directly impaired?
A. Spermatogenesis (mitotic divisions and nourishment of developing sperm) [CORRECT]
B. Testosterone synthesis by Leydig cells
C. LH surge required for ovulation
D. Release of GnRH from the hypothalamus
Correct Answer: A
Rationale: FSH binds receptors on Sertoli cells, stimulating them to nurture developing spermatogenic cells and synthesize
androgen-binding protein (ABP) that maintains high local testosterone. Blocking FSH receptors impairs spermatogenesis.
Leydig cells respond to LH (not FSH), the LH surge governs ovulation in females, and GnRH release is regulated by
hypothalamic kisspeptin neurons responding to steroid feedback, not Sertoli FSH receptors.
Grade A Study Guide | 100% Verified Answers Page 3
, BIOS 252 - Anatomy & Physiology II with Lab | Test 3 Study Guide | Chamberlain University 2026/2027 Edition
Q7. Within the ovary, which cells are the primary source of estrogen during the follicular phase of the
ovarian cycle?
A. Granulosa cells of the developing follicle (with androgen substrate from theca interna) [CORRECT]
B. Theca externa cells only
C. Corpus albicans cells
D. Oogonia within the primordial follicle
Correct Answer: A
Rationale: Estrogen synthesis in the follicular phase uses the two-cell model: LH stimulates theca interna cells to produce
androgens (androstenedione), which diffuse to granulosa cells where FSH upregulates aromatase, converting androgens to
estradiol. Theca externa is a connective tissue layer, the corpus albicans is a regressed corpus luteum producing minimal
hormone, and oogonia are dormant germ cells, not steroidogenic.
Q8. A 28-year-old female with a 28-day menstrual cycle is most likely ovulating on which day, considering a
typical LH surge pattern?
A. Day 14 [CORRECT]
B. Day 7
C. Day 21
D. Day 28
Correct Answer: A
Rationale: In a classic 28-day cycle, rising estrogen from the dominant follicle triggers a positive feedback switch at the
hypothalamus/pituitary, producing the mid-cycle LH surge around day 13, with ovulation occurring approximately 12-24
hours later, around day 14. Day 7 is mid-follicular phase, day 21 is mid-luteal phase, and day 28 is the late luteal phase
approaching menstruation.
Q9. Following ovulation, the ruptured follicle transforms into the corpus luteum under the influence of LH.
The primary hormone secreted by the corpus luteum that prepares the endometrium for potential
implantation is:
A. Progesterone [CORRECT]
B. Estrogen only
C. Follicle-stimulating hormone
D. Human chorionic gonadotropin
Correct Answer: A
Rationale: The corpus luteum secretes large amounts of progesterone (and some estrogen) under continued LH stimulation,
converting the proliferative endometrium into a secretory endometrium with spiral arteries and glandular secretion
supportive of implantation. Estrogen alone cannot sustain secretory changes; FSH is a pituitary gonadotropin; hCG is
produced by the trophoblast after implantation to maintain the corpus luteum.
Grade A Study Guide | 100% Verified Answers Page 4
BIOS 252 - Anatomy & Physiology II with Lab
Comprehensive Study Guide Review
100 Questions | 100% Correct | Grade A Verified
EXAM OVERVIEW
Institution: Chamberlain University
Course: BIOS 252 - Anatomy & Physiology II with Lab
Examination: Test 3 - Comprehensive Review
Edition: Latest Update
Total Questions: 100 (Multiple Choice, Single Best Answer)
Sections: 6 (Reproductive, Embryology, Fluids/Electrolytes,
Senses, Nervous System, Clinical Integration)
Cognitive Distribution: 30% Recall | 50% Application | 20% Analysis
EXAM INSTRUCTIONS
1. This examination contains 100 multiple-choice questions divided into six content sections.
2. Each question has four answer choices (A, B, C, D). Select the SINGLE BEST answer.
3. Cognitive levels: 30% recall, 50% application, 20% analysis - aligned with Chamberlain
University BIOS 252 Test 3 blueprint for the 2026/2027 academic cycle.
4. Each question is followed by the verified correct answer and a comprehensive rationale
explaining the anatomy and physiology reasoning and why distractors are incorrect.
5. Sections cover: Reproductive System; Development, Heredity & Embryology; Fluid,
Electrolyte & Acid-Base Balance; General & Special Senses; Nervous System (ANS & CNS);
and Integrated Clinical Scenarios with Lab Applications.
6. Recommended completion time: 150 minutes. Aim for 80% or higher for Grade A performance.
Chamberlain University | BIOS 252 Anatomy & Physiology II with Lab | Test 3 Study Guide
,BIOS 252 - Anatomy & Physiology II with Lab | Test 3 Study Guide | Chamberlain University 2026/2027 Edition
SECTION 1: REPRODUCTIVE SYSTEM
Questions 1-30 cover male and female reproductive anatomy, hormonal regulation, the ovarian and menstrual cycles, and
pregnancy/lactation physiology.
Q1. A 24-year-old male presents for fertility evaluation. Semen analysis shows a sperm count within normal
limits, but sperm motility is markedly reduced. The physician explains that sperm acquire motility and the
capacity to fertilize an oocyte during their transit through which of the following structures?
A. Epididymis [CORRECT]
B. Vas deferens
C. Rete testis
D. Seminal vesicles
Correct Answer: A
Rationale: Sperm leaving the seminiferous tubules are nonmotile and structurally immature; they gain motility and fertilizing
capacity during their 2-3 week passage through the epididymis, where fluid is resorbed and surface glycoproteins are
remodeled. The vas deferens is a transport conduit only, the rete testis collects sperm from the seminiferous tubules, and the
seminal vesicles contribute fructose-rich fluid but do not mature sperm.
Q2. Which physiologic mechanism maintains the testes 2-3 degrees Celsius below core body temperature,
an essential condition for viable spermatogenesis?
A. Countercurrent heat exchange in the spermatic cord and contraction/relaxation of the dartos and
cremaster muscles [CORRECT]
B. Active secretion of cool fluid by the seminal vesicles surrounding the testes
C. High metabolic rate of Leydig cells generating a thermal gradient
D. Direct parasympathetic vasodilation of the testicular artery only
Correct Answer: A
Rationale: The scrotal temperature is regulated by the dartos muscle (subcutaneous, smooth muscle that wrinkles scrotal skin
to reduce heat loss when cold) and the cremaster muscle (skeletal muscle that raises or lowers the testes). The pampiniform
plexus provides countercurrent heat exchange between warm arterial blood and cooler venous return. The other options
describe nonexistent or incorrect mechanisms; Leydig cells produce testosterone, not a cooling gradient.
Q3. In the male reproductive tract, the bulbourethral (Cowper's) glands secrete a clear, mucus-like fluid
that is released prior to ejaculation. What is the primary physiologic purpose of this secretion?
A. To neutralize residual acidic urine in the urethra and provide lubrication [CORRECT]
B. To supply fructose as an energy substrate for sperm
C. To deliver clotting factors that coagulate semen after deposition
D. To supply alkaline phosphatase that activates sperm capacitation
Correct Answer: A
Rationale: Bulbourethral glands secrete a viscous mucus rich in galactose and sialoprotein that lubricates the glans and
neutralizes residual acidic urine within the spongy urethra, creating a hospitable environment for sperm transit. Fructose is
contributed by the seminal vesicles, clotting factors (semenogelin) come from the seminal vesicles to form the coagulum, and
alkaline phosphatase is a prostate secretion.
Grade A Study Guide | 100% Verified Answers Page 2
,BIOS 252 - Anatomy & Physiology II with Lab | Test 3 Study Guide | Chamberlain University 2026/2027 Edition
Q4. A 19-year-old male asks why semen has an alkaline pH. The correct physiologic explanation is that the
alkaline environment is necessary to:
A. Buffer the acidic environment of the vagina (pH ~3.5-4.5) and protect sperm DNA [CORRECT]
B. Activate the acrosomal reaction before fertilization
C. Trigger capacitation in the epididymis
D. Prevent premature motility loss in the testes
Correct Answer: A
Rationale: Semen pH of 7.2-7.6, primarily established by alkaline prostatic secretions and seminal vesicle fluid, buffers the
normally acidic vaginal environment (pH 3.5-4.5 due to lactobacilli) that would otherwise immobilize sperm and damage
DNA. The acrosomal reaction occurs after capacitation in the female tract, capacitation occurs in the female reproductive
tract (not epididymis), and pH regulation in the testes is unrelated to semen alkalinity.
Q5. Hormonal regulation of spermatogenesis involves a negative feedback loop. Testosterone produced by
Leydig cells directly inhibits which of the following?
A. GnRH release from the hypothalamus and LH secretion from the anterior pituitary [CORRECT]
B. FSH secretion only, with no effect on LH
C. Inhibin release from Sertoli cells only
D. Release of progesterone from Sertoli cells
Correct Answer: A
Rationale: Testosterone, secreted by Leydig cells under LH stimulation, exerts negative feedback on the hypothalamus
(decreasing GnRH) and on the anterior pituitary (decreasing LH), maintaining stable circulating testosterone. Inhibin,
secreted by Sertoli cells under FSH stimulation, specifically inhibits FSH. Testosterone does not directly stimulate inhibin,
and Sertoli cells do not produce progesterone in physiologic quantities.
Q6. A patient is administered a drug that selectively blocks FSH receptors on Sertoli cells. Which cellular
process would be most directly impaired?
A. Spermatogenesis (mitotic divisions and nourishment of developing sperm) [CORRECT]
B. Testosterone synthesis by Leydig cells
C. LH surge required for ovulation
D. Release of GnRH from the hypothalamus
Correct Answer: A
Rationale: FSH binds receptors on Sertoli cells, stimulating them to nurture developing spermatogenic cells and synthesize
androgen-binding protein (ABP) that maintains high local testosterone. Blocking FSH receptors impairs spermatogenesis.
Leydig cells respond to LH (not FSH), the LH surge governs ovulation in females, and GnRH release is regulated by
hypothalamic kisspeptin neurons responding to steroid feedback, not Sertoli FSH receptors.
Grade A Study Guide | 100% Verified Answers Page 3
, BIOS 252 - Anatomy & Physiology II with Lab | Test 3 Study Guide | Chamberlain University 2026/2027 Edition
Q7. Within the ovary, which cells are the primary source of estrogen during the follicular phase of the
ovarian cycle?
A. Granulosa cells of the developing follicle (with androgen substrate from theca interna) [CORRECT]
B. Theca externa cells only
C. Corpus albicans cells
D. Oogonia within the primordial follicle
Correct Answer: A
Rationale: Estrogen synthesis in the follicular phase uses the two-cell model: LH stimulates theca interna cells to produce
androgens (androstenedione), which diffuse to granulosa cells where FSH upregulates aromatase, converting androgens to
estradiol. Theca externa is a connective tissue layer, the corpus albicans is a regressed corpus luteum producing minimal
hormone, and oogonia are dormant germ cells, not steroidogenic.
Q8. A 28-year-old female with a 28-day menstrual cycle is most likely ovulating on which day, considering a
typical LH surge pattern?
A. Day 14 [CORRECT]
B. Day 7
C. Day 21
D. Day 28
Correct Answer: A
Rationale: In a classic 28-day cycle, rising estrogen from the dominant follicle triggers a positive feedback switch at the
hypothalamus/pituitary, producing the mid-cycle LH surge around day 13, with ovulation occurring approximately 12-24
hours later, around day 14. Day 7 is mid-follicular phase, day 21 is mid-luteal phase, and day 28 is the late luteal phase
approaching menstruation.
Q9. Following ovulation, the ruptured follicle transforms into the corpus luteum under the influence of LH.
The primary hormone secreted by the corpus luteum that prepares the endometrium for potential
implantation is:
A. Progesterone [CORRECT]
B. Estrogen only
C. Follicle-stimulating hormone
D. Human chorionic gonadotropin
Correct Answer: A
Rationale: The corpus luteum secretes large amounts of progesterone (and some estrogen) under continued LH stimulation,
converting the proliferative endometrium into a secretory endometrium with spiral arteries and glandular secretion
supportive of implantation. Estrogen alone cannot sustain secretory changes; FSH is a pituitary gonadotropin; hCG is
produced by the trophoblast after implantation to maintain the corpus luteum.
Grade A Study Guide | 100% Verified Answers Page 4
