MCQ Collection
MDCAT Biology MCQs
Practice MDCAT Biology questions with answers and explanations.
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Correct Answer: A. Destruction of alveolar walls and loss of surface area
Explanation:
Alveolar walls break down and elastic recoil decreases.
The effective respiratory surface becomes smaller.
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Correct Answer: B. Atrioventricular valves
Explanation:
Rising ventricular pressure closes the atrioventricular valves.
This produces the first heart sound and prevents backflow to atria.
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Correct Answer: B. Destruction of alveolar walls and loss of surface area
Explanation:
Alveolar walls break down and elastic recoil decreases.
The effective respiratory surface becomes smaller.
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Correct Answer: C. Chondrocytes
Explanation:
Chondrocytes occupy spaces called lacunae in cartilage.
They maintain the extracellular matrix.
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Correct Answer: D. Chondrocytes
Explanation:
Chondrocytes occupy spaces called lacunae in cartilage.
They maintain the extracellular matrix.
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Correct Answer: A. Osteoclasts
Explanation:
Osteoclasts break down mineralized bone.
Their activity participates in remodeling and calcium balance.
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Correct Answer: B. Osteoclasts
Explanation:
Osteoclasts break down mineralized bone.
Their activity participates in remodeling and calcium balance.
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Correct Answer: C. Osteoclasts
Explanation:
Osteoclasts break down mineralized bone.
Their activity participates in remodeling and calcium balance.
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Correct Answer: D. Sarcomere
Explanation:
A sarcomere extends from one Z disc to the next.
Its actin and myosin arrangement produces striation and contraction.
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Correct Answer: A. Sarcomere
Explanation:
A sarcomere extends from one Z disc to the next.
Its actin and myosin arrangement produces striation and contraction.
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Correct Answer: B. Sarcomere
Explanation:
A sarcomere extends from one Z disc to the next.
Its actin and myosin arrangement produces striation and contraction.
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Correct Answer: A. Correct use of barrier protection
Explanation:
Barrier protection reduces exchange of infected body fluids.
Testing and informed prevention are also important.
