A large decrease in resistance is seen in the blood vessels supplying working skeletal muscle during exercise. What is the implication of this exercise effect?
A. Decreased mean arterial pressure (MAP) during exercise
B. Increased mean arterial pressure (MAP) during exercise
C. Decreased systolic pressure (SBP) during exercise
D. Increased blood flow to working muscles
Answer: D. Increased blood flow to working muscles
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Red blood cells have a higher proportion of aquaporins on the membrane than skin cells do. Assuming equal osmotic pressures, which is true?
A. The rate of diffusion for non-polar molecules is faster in skin cells than red blood cells. B. The rate of diffusion for non-polar molecules is faster in red blood cells than skin cells. C. The rate of osmosis is faster in skin cells than red blood cells. D. No significant differences in osmosis or diffusion rates between these cells. E. The rate of osmosis is faster in red blood cells than in skin cells.
Which of the following is not a motor cranial nerve?
A. Trochlear nerve (IV) B. Abducens nerve (VI) C. Hypoglossal nerve (XII) D. Vestibulocochlear nerve (VIII) E. Accessory nerve (XI)
Which muscle(s) can contract without the need for nervous stimulation?
A) Cardiac muscle only B) Skeletal muscle only C) Skeletal, smooth and cardiac muscle D) Smooth muscle only E) Smooth and cardiac muscle
Sometimes enzymes don't have a perfect fit with a substrate and have to be adjusted into the right shape. This would describe the
Lock and key model Induced fit model Reduced yield model