BIOD 102 Biology II - Module 5 Exam | Portage Learning | 2026/2027 Updated Form M5-E | 75 Questions
PORTAGE LEARNING | BIOD 102 BIOLOGY II
BIOD 102 Biology II Module 5 Exam
Animal Form, Function, and Homeostasis | Portage Learning | 2026/2027 Updated Edition
75 Questions 6 Sections Multiple Choice (A-D), one correct answer Answer key with detailed rationales included
Instructions: Choose the single best answer for each of the 75 questions. The correct choice is marked [CORRECT] and a
physiological rationale follows every item; for a realistic self-test, cover each answer block before responding. Section boundaries list
the question ranges so you can align practice with each module topic.
Section 1: Animal Body Organization and Homeostasis
Tissue Types, Organ Systems, Feedback Mechanisms, and Thermoregulation | Questions 1-12
Q1: Which of the following characteristics is common to all epithelial tissues?
A. Cells are widely spaced within an abundant extracellular matrix and are highly vascular.
B. Cells are tightly packed into continuous sheets that cover surfaces or line cavities, and the tissue itself is
avascular. [CORRECT]
C. Cells are long, cylindrical, striated, and under voluntary control.
D. Cells are embedded in a fluid matrix called plasma that transports oxygen throughout the body.
Correct Answer: B
Rationale: Epithelial tissue is defined by tightly packed cells arranged in continuous sheets that cover body surfaces, line
organs, and form glands. Because no blood vessels penetrate an epithelial sheet, it is avascular and must obtain nutrients by
diffusion from underlying connective tissue. Option A describes connective tissue, Option C describes skeletal muscle, and
Option D incorrectly mixes blood plasma (a connective tissue component) with epithelium.
Q2: A basketball player lands awkwardly and is diagnosed with a severe ankle sprain in which a ligament was
overstretched. The physician explains that the damaged structure is composed of densely packed collagen fibers that
connect bone to bone. Which tissue type was injured?
A. Dense connective tissue [CORRECT]
B. Adipose tissue
C. Hyaline cartilage
D. Stratified squamous epithelium
Correct Answer: A
Rationale: Ligaments are straps of dense connective tissue proper, packed with collagen fibers produced by fibroblasts, and
they anchor bone to bone while resisting tensile force. Adipose tissue stores energy and insulates rather than binds bones,
and hyaline cartilage provides smooth, compressible padding at joint surfaces but does not link bones. Stratified squamous
epithelium protects abrasive surfaces such as skin and the esophagus and has no structural cable function.
1
,BIOD 102 Biology II - Module 5 Exam | Portage Learning | 2026/2027 Updated Form M5-E | 75 Questions
Q3: A histology slide shows branched, striated cells joined end to end by dark-staining intercalated discs. Contraction
of these cells occurs without conscious input. Which tissue is being viewed?
A. Skeletal muscle tissue
B. Smooth muscle tissue
C. Nervous tissue
D. Cardiac muscle tissue [CORRECT]
Correct Answer: D
Rationale: Intercalated discs containing gap junctions and desmosomes are the hallmark of cardiac muscle, allowing
electrical signals to spread so the heart beats as a coordinated, involuntary unit. Skeletal muscle is striated but unbranched,
multinucleate, and voluntarily controlled, while smooth muscle is involuntary but lacks striations entirely. Nervous tissue
contains neurons and glia and does not contract.
Q4: During a 100-meter sprint, an athlete's heart rate climbs, breathing deepens, and epinephrine is released to help
mobilize fuel for the leg muscles. Which set of organ systems must work together to make this integrated response
possible?
A. Only the muscular and skeletal systems, since they generate the movement
B. Only the integumentary and lymphatic systems, since they cool and protect the body
C. The nervous, endocrine, cardiovascular, and respiratory systems coordinating with the muscular system
[CORRECT]
D. The digestive and urinary systems acting alone, since they supply and filter the blood
Correct Answer: C
Rationale: Exercise demands multi-system integration: the nervous system commands the muscles, the endocrine system
releases epinephrine, the respiratory system loads oxygen and unloads carbon dioxide, and the cardiovascular system
delivers oxygen and glucose to working muscle. Options A and B are far too narrow because no system acts alone during
exercise, and Option D omits the systems that actually control heart rate and breathing. Recognizing cross-system
cooperation is central to animal physiology.
Q5: After a large meal, a student's blood glucose concentration rises above the normal range. Which sequence
correctly describes the negative feedback response that restores homeostasis?
A. Pancreatic beta cells detect the rise, release insulin, and body cells take up glucose until blood glucose falls
and insulin secretion declines. [CORRECT]
B. Pancreatic alpha cells detect the rise, release glucagon, and the liver breaks down glycogen to release even
more glucose.
C. The pituitary gland detects the rise and releases insulin, which causes blood glucose to continue rising in a
positive feedback loop.
D. Sweat glands detect the glucose and excrete the excess sugar through the skin until levels normalize.
Correct Answer: A
Rationale: In negative feedback, the effector's action reverses the original stimulus: insulin promotes glucose uptake by
liver, muscle, and fat cells, so the deviation is corrected and the signal shuts off. Glucagon (Option B) does the opposite of
what is needed and is released when glucose is low, not high. Option C misidentifies both the gland and the mechanism, and
glucose is not excreted through sweat to regulate blood levels.
2
, BIOD 102 Biology II - Module 5 Exam | Portage Learning | 2026/2027 Updated Form M5-E | 75 Questions
Q6: Which of the following physiological events is the classic example of a positive feedback loop?
A. Regulation of body temperature by sweating and vasodilation
B. Intensification of uterine contractions during labor as oxytocin release increases [CORRECT]
C. Return of blood glucose to normal after insulin secretion
D. Decrease of urine production when antidiuretic hormone is released
Correct Answer: B
Rationale: During labor, oxytocin causes stronger contractions, contractions stimulate even more oxytocin release, and the
loop amplifies until delivery ends the stimulus - the defining pattern of positive feedback. Sweating, insulin-mediated
glucose lowering, and antidiuretic hormone action are all corrective loops that reverse a deviation, which makes them
negative feedback examples. Positive feedback is rare in the body precisely because it pushes systems away from a set point
until a discrete endpoint is reached.
Q7: A patient with a bacterial infection develops a fever, and during the rising phase she experiences chills and
shivering. Which explanation best accounts for these chills?
A. Positive feedback is cooling the body below the normal set point on purpose.
B. Skin receptors have failed, so the body can no longer sense any temperature at all.
C. Pyrogens have raised the hypothalamic set point, so the brain treats the current body temperature as too low
and triggers heat-generating responses such as shivering. [CORRECT]
D. The hypothalamus has temporarily shut down thermoregulation, allowing body temperature to drift
randomly.
Correct Answer: C
Rationale: Circulating pyrogens from the immune response elevate the hypothalamic thermostat, so negative feedback now
defends a higher set point; because actual body temperature is below that new target, the body initiates chills and shivering
to raise it. This is still negative feedback - it simply defends a temporarily shifted set point. Positive feedback cooling
(Option A) contradicts the physiology, receptors remain functional (Option B), and thermoregulation never simply switches
off (Option D).
Q8: A desert tortoise and a kit fox live in the same habitat. On a cool morning the tortoise is sluggish, while the fox
remains fully active. Which statement best explains this difference?
A. The tortoise is an endotherm whose metabolic heat production collapses in the cold.
B. The fox is an ectotherm that absorbs heat directly from sun-warmed rocks.
C. The tortoise lacks any physiological temperature regulation and dies at all temperatures below 20 degrees C.
D. The tortoise is an ectotherm whose body temperature and metabolic rate fall with the cool environment,
while the endothermic fox generates metabolic heat to keep its tissues warm. [CORRECT]
Correct Answer: D
Rationale: Ectotherms such as reptiles rely mainly on external heat sources, so low environmental temperatures directly
lower body temperature, enzyme activity, and metabolic rate, producing sluggish behavior. Endotherms such as mammals
maintain body temperature through metabolically generated heat, allowing activity even when it is cool. Option A reverses
the definitions, Option B reverses them again for the fox, and Option C overstates the case because the tortoise tolerates
cool temperatures, it just becomes less active.
3
PORTAGE LEARNING | BIOD 102 BIOLOGY II
BIOD 102 Biology II Module 5 Exam
Animal Form, Function, and Homeostasis | Portage Learning | 2026/2027 Updated Edition
75 Questions 6 Sections Multiple Choice (A-D), one correct answer Answer key with detailed rationales included
Instructions: Choose the single best answer for each of the 75 questions. The correct choice is marked [CORRECT] and a
physiological rationale follows every item; for a realistic self-test, cover each answer block before responding. Section boundaries list
the question ranges so you can align practice with each module topic.
Section 1: Animal Body Organization and Homeostasis
Tissue Types, Organ Systems, Feedback Mechanisms, and Thermoregulation | Questions 1-12
Q1: Which of the following characteristics is common to all epithelial tissues?
A. Cells are widely spaced within an abundant extracellular matrix and are highly vascular.
B. Cells are tightly packed into continuous sheets that cover surfaces or line cavities, and the tissue itself is
avascular. [CORRECT]
C. Cells are long, cylindrical, striated, and under voluntary control.
D. Cells are embedded in a fluid matrix called plasma that transports oxygen throughout the body.
Correct Answer: B
Rationale: Epithelial tissue is defined by tightly packed cells arranged in continuous sheets that cover body surfaces, line
organs, and form glands. Because no blood vessels penetrate an epithelial sheet, it is avascular and must obtain nutrients by
diffusion from underlying connective tissue. Option A describes connective tissue, Option C describes skeletal muscle, and
Option D incorrectly mixes blood plasma (a connective tissue component) with epithelium.
Q2: A basketball player lands awkwardly and is diagnosed with a severe ankle sprain in which a ligament was
overstretched. The physician explains that the damaged structure is composed of densely packed collagen fibers that
connect bone to bone. Which tissue type was injured?
A. Dense connective tissue [CORRECT]
B. Adipose tissue
C. Hyaline cartilage
D. Stratified squamous epithelium
Correct Answer: A
Rationale: Ligaments are straps of dense connective tissue proper, packed with collagen fibers produced by fibroblasts, and
they anchor bone to bone while resisting tensile force. Adipose tissue stores energy and insulates rather than binds bones,
and hyaline cartilage provides smooth, compressible padding at joint surfaces but does not link bones. Stratified squamous
epithelium protects abrasive surfaces such as skin and the esophagus and has no structural cable function.
1
,BIOD 102 Biology II - Module 5 Exam | Portage Learning | 2026/2027 Updated Form M5-E | 75 Questions
Q3: A histology slide shows branched, striated cells joined end to end by dark-staining intercalated discs. Contraction
of these cells occurs without conscious input. Which tissue is being viewed?
A. Skeletal muscle tissue
B. Smooth muscle tissue
C. Nervous tissue
D. Cardiac muscle tissue [CORRECT]
Correct Answer: D
Rationale: Intercalated discs containing gap junctions and desmosomes are the hallmark of cardiac muscle, allowing
electrical signals to spread so the heart beats as a coordinated, involuntary unit. Skeletal muscle is striated but unbranched,
multinucleate, and voluntarily controlled, while smooth muscle is involuntary but lacks striations entirely. Nervous tissue
contains neurons and glia and does not contract.
Q4: During a 100-meter sprint, an athlete's heart rate climbs, breathing deepens, and epinephrine is released to help
mobilize fuel for the leg muscles. Which set of organ systems must work together to make this integrated response
possible?
A. Only the muscular and skeletal systems, since they generate the movement
B. Only the integumentary and lymphatic systems, since they cool and protect the body
C. The nervous, endocrine, cardiovascular, and respiratory systems coordinating with the muscular system
[CORRECT]
D. The digestive and urinary systems acting alone, since they supply and filter the blood
Correct Answer: C
Rationale: Exercise demands multi-system integration: the nervous system commands the muscles, the endocrine system
releases epinephrine, the respiratory system loads oxygen and unloads carbon dioxide, and the cardiovascular system
delivers oxygen and glucose to working muscle. Options A and B are far too narrow because no system acts alone during
exercise, and Option D omits the systems that actually control heart rate and breathing. Recognizing cross-system
cooperation is central to animal physiology.
Q5: After a large meal, a student's blood glucose concentration rises above the normal range. Which sequence
correctly describes the negative feedback response that restores homeostasis?
A. Pancreatic beta cells detect the rise, release insulin, and body cells take up glucose until blood glucose falls
and insulin secretion declines. [CORRECT]
B. Pancreatic alpha cells detect the rise, release glucagon, and the liver breaks down glycogen to release even
more glucose.
C. The pituitary gland detects the rise and releases insulin, which causes blood glucose to continue rising in a
positive feedback loop.
D. Sweat glands detect the glucose and excrete the excess sugar through the skin until levels normalize.
Correct Answer: A
Rationale: In negative feedback, the effector's action reverses the original stimulus: insulin promotes glucose uptake by
liver, muscle, and fat cells, so the deviation is corrected and the signal shuts off. Glucagon (Option B) does the opposite of
what is needed and is released when glucose is low, not high. Option C misidentifies both the gland and the mechanism, and
glucose is not excreted through sweat to regulate blood levels.
2
, BIOD 102 Biology II - Module 5 Exam | Portage Learning | 2026/2027 Updated Form M5-E | 75 Questions
Q6: Which of the following physiological events is the classic example of a positive feedback loop?
A. Regulation of body temperature by sweating and vasodilation
B. Intensification of uterine contractions during labor as oxytocin release increases [CORRECT]
C. Return of blood glucose to normal after insulin secretion
D. Decrease of urine production when antidiuretic hormone is released
Correct Answer: B
Rationale: During labor, oxytocin causes stronger contractions, contractions stimulate even more oxytocin release, and the
loop amplifies until delivery ends the stimulus - the defining pattern of positive feedback. Sweating, insulin-mediated
glucose lowering, and antidiuretic hormone action are all corrective loops that reverse a deviation, which makes them
negative feedback examples. Positive feedback is rare in the body precisely because it pushes systems away from a set point
until a discrete endpoint is reached.
Q7: A patient with a bacterial infection develops a fever, and during the rising phase she experiences chills and
shivering. Which explanation best accounts for these chills?
A. Positive feedback is cooling the body below the normal set point on purpose.
B. Skin receptors have failed, so the body can no longer sense any temperature at all.
C. Pyrogens have raised the hypothalamic set point, so the brain treats the current body temperature as too low
and triggers heat-generating responses such as shivering. [CORRECT]
D. The hypothalamus has temporarily shut down thermoregulation, allowing body temperature to drift
randomly.
Correct Answer: C
Rationale: Circulating pyrogens from the immune response elevate the hypothalamic thermostat, so negative feedback now
defends a higher set point; because actual body temperature is below that new target, the body initiates chills and shivering
to raise it. This is still negative feedback - it simply defends a temporarily shifted set point. Positive feedback cooling
(Option A) contradicts the physiology, receptors remain functional (Option B), and thermoregulation never simply switches
off (Option D).
Q8: A desert tortoise and a kit fox live in the same habitat. On a cool morning the tortoise is sluggish, while the fox
remains fully active. Which statement best explains this difference?
A. The tortoise is an endotherm whose metabolic heat production collapses in the cold.
B. The fox is an ectotherm that absorbs heat directly from sun-warmed rocks.
C. The tortoise lacks any physiological temperature regulation and dies at all temperatures below 20 degrees C.
D. The tortoise is an ectotherm whose body temperature and metabolic rate fall with the cool environment,
while the endothermic fox generates metabolic heat to keep its tissues warm. [CORRECT]
Correct Answer: D
Rationale: Ectotherms such as reptiles rely mainly on external heat sources, so low environmental temperatures directly
lower body temperature, enzyme activity, and metabolic rate, producing sluggish behavior. Endotherms such as mammals
maintain body temperature through metabolically generated heat, allowing activity even when it is cool. Option A reverses
the definitions, Option B reverses them again for the fox, and Option C overstates the case because the tortoise tolerates
cool temperatures, it just becomes less active.
3
