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2025 ATI ANATOMY AND PHYSIOLOGY PROCTORED EXAM QUESTIONS & ANSWERS WITH RATIONALES (best answers)
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2025 ATI ANATOMY AND PHYSIOLOGY PROCTORED EXAM QUESTIONS & ANSWERS WITH RATIONALES (best answers)
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2025 ATI ANATOMY AND PHYSIOLOGYPROCTORED EXAM QUESTIONS & ANSWERS
WITH RATIONALES
Question 1:
What is the primary function of the respiratory system? A) Pump blood
throughout the body
B) Transport oxygen to tissues
C) Remove carbon dioxide from the body
D) Regulate body temperature
Answer: C) Remove carbon dioxide from the body
Rationale: The primary function of the respiratory system is to facilitate gas
exchange, which includes removing carbon dioxide (a waste product of
metabolism) from the body and providing oxygen to the bloodstream.
Question 2:
Which structure in the brain is responsible for regulating body temperature? A)
Cerebellum
B) Medulla oblongata
C) Hypothalamus
D) Corpus callosum
Answer: C) Hypothalamus
Rationale: The hypothalamus plays a critical role in regulating homeostasis,
including the regulation of body temperature, hunger, thirst, and other vital
functions.
Question 3:
,Which of the following is a function of the liver? A) Production of insulin
B) Breakdown of red blood cells
C) Production of bile
D) Filtration of urine
Answer: C) Production of bile
Rationale: The liver produces bile, which helps in the digestion and absorption of
fats. It also has other important functions like detoxifying harmful substances and
metabolizing nutrients.
Question 4:
Which blood vessel carries oxygenated blood from the lungs to the heart? A)
Aorta
B) Pulmonary artery
C) Pulmonary vein
D) Superior vena cava
Answer: C) Pulmonary vein
Rationale: The pulmonary vein is the only blood vessel that carries oxygenated
blood from the lungs to the heart, specifically to the left atrium.
Question 5:
Which layer of the skin is responsible for the sensation of touch? A) Epidermis
B) Dermis
C) Subcutaneous tissue
D) Hypodermis
Answer: B) Dermis
Rationale: The dermis contains sensory receptors, such as Meissner's corpuscles,
which are responsible for the sensation of touch. The epidermis is mainly involved
in protection and waterproofing.
,Question 6:
Which of the following is the correct sequence of the pathway that an action
potential travels through the heart? A) AV node → SA node → Bundle of His →
Purkinje fibers
B) SA node → AV node → Bundle of His → Purkinje fibers
C) AV node → Bundle of His → Purkinje fibers → SA node
D) Purkinje fibers → SA node → AV node → Bundle of His
Answer: B) SA node → AV node → Bundle of His → Purkinje fibers
Rationale: The electrical impulse in the heart begins at the SA node (sinoatrial
node), travels to the AV node (atrioventricular node), then through the Bundle of
His, and finally reaches the Purkinje fibers, which trigger ventricular contraction.
Question 7:
What is the main function of the kidneys? A) Synthesize glucose
B) Filter blood to remove waste
C) Produce hormones that regulate metabolism
D) Absorb nutrients
Answer: B) Filter blood to remove waste
Rationale: The kidneys filter blood to remove waste products and excess
substances, which are excreted as urine. They also regulate fluid and electrolyte
balance and produce hormones like erythropoietin.
Question 8:
Which organ produces insulin? A) Pancreas
B) Liver
C) Kidneys
D) Small intestine
Answer: A) Pancreas
, Rationale: The pancreas produces insulin, a hormone that helps regulate blood
glucose levels by promoting the uptake of glucose into cells.
Question 9:
Which of the following structures is part of the lymphatic system? A) Heart
B) Kidneys
C) Spleen
D) Liver
Answer: C) Spleen
Rationale: The spleen is a part of the lymphatic system and plays an important
role in filtering blood, recycling iron, and helping the immune system fight
infections.
Question 10:
Which of the following is NOT a part of the central nervous system (CNS)? A)
Brain
B) Spinal cord
C) Nerves
D) Both A and B
Answer: C) Nerves
Rationale: The central nervous system consists of the brain and spinal cord.
Nerves are part of the peripheral nervous system, which connects the CNS to the
rest of the body.
11. Which of the following is the main function of the respiratory system?
A) Transport oxygen to tissues
B) Exchange gases between the blood and environment
C) Secrete hormones
D) Regulate body temperature
Answer: B) Exchange gases between the blood and environment
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