BIO105 | BIO105 Anatomy and Physiology 1 Exam
4 Version 3 Questions with Correct Answers and
Expert Explanation for Each Question
1. Which component of a negative feedback loop is responsible for detecting changes
in the internal environment?
A. Effector
B. Receptor
C. Control Center
D. Variable
Correct Answer: B
Expert Explanation: The receptor acts as a sensor that monitors specific
environmental conditions for changes. Once a change is detected, it sends
information to the control center for evaluation. This interaction ensures that the
body can initiate a corrective response to maintain homeostasis. Without functional
receptors, the feedback loop cannot begin, leading to potential physiological
imbalance. Such coordination is vital for survival in fluctuating external
environments.
2. When comparing the nervous and endocrine systems, which statement best
describes their coordination?
A. The nervous system is slower and longer-lasting than the endocrine system.
,B. The endocrine system uses electrical impulses for rapid communication.
C. The nervous system provides rapid, short-term responses, while the endocrine
system provides slower, long-term regulation.
D. Both systems use hormones as their primary method of communication.
Correct Answer: C
Expert Explanation: The nervous system utilizes electrical impulses for rapid,
short-term coordination across the body. In contrast, the endocrine system uses
hormones to provide slower but longer-lasting regulatory effects. Both systems
work together to maintain internal balance through complex communication
pathways. Understanding this integration is essential for clinical practice in nursing
and medicine. Their combined function allows the body to adapt to various
physiological stressors.
3. Which structure serves as the primary link between the nervous system and the
endocrine system?
A. Thalamus
B. Cerebellum
C. Pineal Gland
D. Hypothalamus
,Correct Answer: D
Expert Explanation: The hypothalamus is often called the master command center
because it regulates the pituitary gland. It integrates signals from the nervous
system to trigger appropriate endocrine responses. This coordination is
fundamental for maintaining homeostasis in temperature, thirst, and hunger. It also
plays a key role in the body’s adaptation to emotional and physical stress. Its clinical
relevance is high as damage can disrupt multiple vital body systems.
4. During the ‘alarm phase’ of the general adaptation syndrome, which hormone is
primarily responsible for the fight-or-flight response?
A. Cortisol
B. Insulin
C. Epinephrine
D. Thyroxine
Correct Answer: C
Expert Explanation: During the alarm phase, the sympathetic nervous system
triggers the release of epinephrine from the adrenal medulla. This hormone
increases heart rate and blood flow to muscles to prepare the body for immediate
action. This rapid physiological change is a hallmark of the survival-oriented stress
response. It demonstrates the direct interaction between neural stimulation and
, hormonal release. Clinically, epinephrine is used to treat life-threatening conditions
like anaphylaxis.
5. If blood glucose levels drop below the set point, which hormone is secreted to
restore homeostatic balance?
A. Insulin
B. Somatostatin
C. Glucagon
D. Aldosterone
Correct Answer: C
Expert Explanation: Glucagon is released by the alpha cells of the pancreas when
blood sugar is low. It travels to the liver to stimulate the breakdown of glycogen into
glucose. This process is a classic example of a negative feedback loop maintaining
metabolic balance. Proper regulation of glucose is critical for fueling cellular
activities throughout the body. Failure in this system can lead to severe clinical
outcomes like hypoglycemia.
6. The thick muscular wall of the left ventricle is a structural adaptation that supports
which physiological function?
A. Pumping blood to the lungs at low pressure.
B. Receiving blood from the pulmonary veins.
4 Version 3 Questions with Correct Answers and
Expert Explanation for Each Question
1. Which component of a negative feedback loop is responsible for detecting changes
in the internal environment?
A. Effector
B. Receptor
C. Control Center
D. Variable
Correct Answer: B
Expert Explanation: The receptor acts as a sensor that monitors specific
environmental conditions for changes. Once a change is detected, it sends
information to the control center for evaluation. This interaction ensures that the
body can initiate a corrective response to maintain homeostasis. Without functional
receptors, the feedback loop cannot begin, leading to potential physiological
imbalance. Such coordination is vital for survival in fluctuating external
environments.
2. When comparing the nervous and endocrine systems, which statement best
describes their coordination?
A. The nervous system is slower and longer-lasting than the endocrine system.
,B. The endocrine system uses electrical impulses for rapid communication.
C. The nervous system provides rapid, short-term responses, while the endocrine
system provides slower, long-term regulation.
D. Both systems use hormones as their primary method of communication.
Correct Answer: C
Expert Explanation: The nervous system utilizes electrical impulses for rapid,
short-term coordination across the body. In contrast, the endocrine system uses
hormones to provide slower but longer-lasting regulatory effects. Both systems
work together to maintain internal balance through complex communication
pathways. Understanding this integration is essential for clinical practice in nursing
and medicine. Their combined function allows the body to adapt to various
physiological stressors.
3. Which structure serves as the primary link between the nervous system and the
endocrine system?
A. Thalamus
B. Cerebellum
C. Pineal Gland
D. Hypothalamus
,Correct Answer: D
Expert Explanation: The hypothalamus is often called the master command center
because it regulates the pituitary gland. It integrates signals from the nervous
system to trigger appropriate endocrine responses. This coordination is
fundamental for maintaining homeostasis in temperature, thirst, and hunger. It also
plays a key role in the body’s adaptation to emotional and physical stress. Its clinical
relevance is high as damage can disrupt multiple vital body systems.
4. During the ‘alarm phase’ of the general adaptation syndrome, which hormone is
primarily responsible for the fight-or-flight response?
A. Cortisol
B. Insulin
C. Epinephrine
D. Thyroxine
Correct Answer: C
Expert Explanation: During the alarm phase, the sympathetic nervous system
triggers the release of epinephrine from the adrenal medulla. This hormone
increases heart rate and blood flow to muscles to prepare the body for immediate
action. This rapid physiological change is a hallmark of the survival-oriented stress
response. It demonstrates the direct interaction between neural stimulation and
, hormonal release. Clinically, epinephrine is used to treat life-threatening conditions
like anaphylaxis.
5. If blood glucose levels drop below the set point, which hormone is secreted to
restore homeostatic balance?
A. Insulin
B. Somatostatin
C. Glucagon
D. Aldosterone
Correct Answer: C
Expert Explanation: Glucagon is released by the alpha cells of the pancreas when
blood sugar is low. It travels to the liver to stimulate the breakdown of glycogen into
glucose. This process is a classic example of a negative feedback loop maintaining
metabolic balance. Proper regulation of glucose is critical for fueling cellular
activities throughout the body. Failure in this system can lead to severe clinical
outcomes like hypoglycemia.
6. The thick muscular wall of the left ventricle is a structural adaptation that supports
which physiological function?
A. Pumping blood to the lungs at low pressure.
B. Receiving blood from the pulmonary veins.
