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Accurate WGU D313 2025 Objective Assessment | Detailed Anatomy and Physiology Exam Questions (westernGU)

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Accurate WGU D313 2025 Objective Assessment | Detailed Anatomy and Physiology Exam Questions (westernGU)

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  • June 3, 2024
  • December 19, 2024
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  • 2023/2024
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WGU D313 Anatomy and Physiology Objective
Assessment 2025 | Up-to-Date Exam
Questions with Detailed Answers

1. Which structure is responsible for regulating the amount of light
that enters the eye?
A) Retina
B) Cornea
C) Iris
D) Lens
Answer: C) Iris
Rationale: The iris is the colored part of the eye that controls the size of
the pupil, thereby regulating the amount of light that enters the eye.
2. Which of the following is the main function of red blood cells?
A) Transport oxygen
B) Fight infection
C) Clot blood
D) Produce hormones
Answer: A) Transport oxygen
Rationale: Red blood cells (RBCs) contain hemoglobin, which binds to
oxygen and transports it from the lungs to the tissues throughout the
body.
3. Which part of the brain controls voluntary muscle movements?
A) Cerebellum
B) Medulla Oblongata

,C) Cerebrum
D) Thalamus
Answer: C) Cerebrum
Rationale: The cerebrum is responsible for higher functions such as
voluntary muscle movements, decision-making, and reasoning. The
motor cortex located in the frontal lobe is specifically involved in
voluntary motor control.
4. What is the primary function of the nephron in the kidneys?
A) Secretion of hormones
B) Filtration of blood
C) Storage of urine
D) Reabsorption of water
Answer: B) Filtration of blood
Rationale: The nephron is the functional unit of the kidney that filters
blood to remove waste, excess substances, and water, forming urine.
5. Which hormone is primarily responsible for regulating blood
calcium levels?
A) Insulin
B) Thyroxine
C) Parathyroid hormone (PTH)
D) Epinephrine
Answer: C) Parathyroid hormone (PTH)
Rationale: Parathyroid hormone regulates calcium levels in the blood by
stimulating the release of calcium from bones, increasing calcium
reabsorption in the kidneys, and promoting vitamin D activation.
6. Which of the following is a function of the skeletal system?

,A) Blood cell production
B) Regulation of metabolism
C) Secretion of digestive enzymes
D) Transport of gases
Answer: A) Blood cell production
Rationale: The skeletal system contains bone marrow, which produces
red blood cells, white blood cells, and platelets, playing a key role in
blood cell production.
7. Which part of the heart is responsible for pumping oxygenated
blood to the body?
A) Left atrium
B) Right atrium
C) Left ventricle
D) Right ventricle
Answer: C) Left ventricle
Rationale: The left ventricle pumps oxygenated blood into the aorta,
which then distributes it throughout the body.
8. What is the role of the myelin sheath in the nervous system?
A) Transmit electrical impulses
B) Protect neurons from infection
C) Speed up the transmission of electrical signals
D) Produce neurotransmitters
Answer: C) Speed up the transmission of electrical signals
Rationale: The myelin sheath is a fatty layer that insulates nerve fibers,
increasing the speed at which electrical signals travel along the axon.
9. Which of the following is a characteristic of smooth muscle?

, A) Voluntary control
B) Striated appearance
C) Found in the walls of internal organs
D) Multinucleated cells
Answer: C) Found in the walls of internal organs
Rationale: Smooth muscle is non-striated, involuntary muscle found in
the walls of internal organs such as the stomach, intestines, and blood
vessels.
10. Which of the following best describes the role of the alveoli in the
lungs?
A) Carry oxygen to the blood
B) Exchange oxygen and carbon dioxide
C) Produce mucus
D) Transport air to the bronchi
Answer: B) Exchange oxygen and carbon dioxide
Rationale: Alveoli are tiny air sacs in the lungs where the exchange of
oxygen and carbon dioxide occurs between the air and the blood.


11. Question:
Which of the following is responsible for the production of insulin?
A. Adrenal glands
B. Pancreas
C. Liver
D. Thyroid
Answer: B. Pancreas
Rationale: The pancreas produces insulin, a hormone that regulates
blood glucose levels.

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