BIO 201 Exam 1 V2 | BIO 201 A&P |
StraighterLine | Q&A with Rationale (BIO
201 Exam 1)
1. Which of the following describes the anatomical position?
A. The body is standing erect, feet slightly apart, arms at the sides, with palms facing
forward.
B. The body is lying supine with arms extended and palms facing down.
C. The body is standing erect, arms at the sides, with palms facing backward.
D. The body is lying prone with the head turned to the side and arms at the side.
Answer: A
Rationale: The anatomical position is the standard reference point for all medical and
anatomical descriptions. It requires the individual to stand upright with the feet flat on the
floor and the palms directed anteriorly. This specific orientation ensures that terms like left
and right are applied consistently across all clinical observations.
2. In a negative feedback loop, what is the primary role of the effector?
A. To detect a change in the external environment.
B. To process information and determine the set point.
C. To carry out a response that reverses the original stimulus.
D. To deliver sensory information to the control center.
,Answer: C
Rationale: The effector is the component of a homeostatic control system that receives
output from the control center. It produces a response that specifically counteracts or
reduces the initial deviation from the set point. For example, when body temperature
drops, skeletal muscles act as effectors by shivering to generate heat.
3. Which vertical plane divides the body into unequal left and right portions?
A. Midsagittal plane
B. Transverse plane
C. Frontal plane
D. Parasagittal plane
Answer: D
Rationale: A parasagittal plane is a vertical cut that is parallel to the midline but does not
pass through it, resulting in unequal sections. In contrast, the midsagittal plane divides the
body into exactly equal halves. The frontal and transverse planes divide the body into
anterior/posterior and superior/inferior sections respectively.
4. Which level of structural organization is characterized by groups of similar cells working
together to perform a specific function?
A. Tissue level
B. Organ level
, C. Chemical level
D. Systemic level
Answer: A
Rationale: The tissue level is the third level of structural organization, sitting between the
cellular and organ levels. It consists of groups of integrated cells that share a common
embryonic origin and specialized function. There are four primary types of tissues in the
human body: epithelial, connective, muscle, and nervous.
5. Which of the following is an example of a positive feedback mechanism?
A. Regulation of blood glucose levels via insulin.
B. Control of blood pressure by adjusting heart rate.
C. Maintenance of body temperature through sweating.
D. The process of labor contractions during childbirth.
Answer: D
Rationale: Positive feedback mechanisms enhance or accelerate a process rather than
reversing it. During childbirth, the hormone oxytocin stimulates uterine contractions,
which in turn causes the release of more oxytocin until delivery is complete. This is distinct
from negative feedback, which aims to return the body to a stable equilibrium.
6. The thumb is ________ to the pinky finger.
A. Medial
StraighterLine | Q&A with Rationale (BIO
201 Exam 1)
1. Which of the following describes the anatomical position?
A. The body is standing erect, feet slightly apart, arms at the sides, with palms facing
forward.
B. The body is lying supine with arms extended and palms facing down.
C. The body is standing erect, arms at the sides, with palms facing backward.
D. The body is lying prone with the head turned to the side and arms at the side.
Answer: A
Rationale: The anatomical position is the standard reference point for all medical and
anatomical descriptions. It requires the individual to stand upright with the feet flat on the
floor and the palms directed anteriorly. This specific orientation ensures that terms like left
and right are applied consistently across all clinical observations.
2. In a negative feedback loop, what is the primary role of the effector?
A. To detect a change in the external environment.
B. To process information and determine the set point.
C. To carry out a response that reverses the original stimulus.
D. To deliver sensory information to the control center.
,Answer: C
Rationale: The effector is the component of a homeostatic control system that receives
output from the control center. It produces a response that specifically counteracts or
reduces the initial deviation from the set point. For example, when body temperature
drops, skeletal muscles act as effectors by shivering to generate heat.
3. Which vertical plane divides the body into unequal left and right portions?
A. Midsagittal plane
B. Transverse plane
C. Frontal plane
D. Parasagittal plane
Answer: D
Rationale: A parasagittal plane is a vertical cut that is parallel to the midline but does not
pass through it, resulting in unequal sections. In contrast, the midsagittal plane divides the
body into exactly equal halves. The frontal and transverse planes divide the body into
anterior/posterior and superior/inferior sections respectively.
4. Which level of structural organization is characterized by groups of similar cells working
together to perform a specific function?
A. Tissue level
B. Organ level
, C. Chemical level
D. Systemic level
Answer: A
Rationale: The tissue level is the third level of structural organization, sitting between the
cellular and organ levels. It consists of groups of integrated cells that share a common
embryonic origin and specialized function. There are four primary types of tissues in the
human body: epithelial, connective, muscle, and nervous.
5. Which of the following is an example of a positive feedback mechanism?
A. Regulation of blood glucose levels via insulin.
B. Control of blood pressure by adjusting heart rate.
C. Maintenance of body temperature through sweating.
D. The process of labor contractions during childbirth.
Answer: D
Rationale: Positive feedback mechanisms enhance or accelerate a process rather than
reversing it. During childbirth, the hormone oxytocin stimulates uterine contractions,
which in turn causes the release of more oxytocin until delivery is complete. This is distinct
from negative feedback, which aims to return the body to a stable equilibrium.
6. The thumb is ________ to the pinky finger.
A. Medial
