Which of the following is NOT true regarding ventilation-perfusion inequality?
A. It is increased from normal in patients with emphysema.
B. It is caused by too little or too much blood flow relative to ventilation.
C. No inequality exists in normal lungs.
D. It may result from increased alveolar dead space.
E. It is caused by too little or too much ventilation relative to blood flow.
Answer: C
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A person with excess carbon dioxide in the blood has a problem with ventilation.
Answer the following statement true (T) or false (F)
Describe a hypothetical situation in which two isolated human populations evolve very different muscle fiber composition
In other words, what environmental conditions or food-gathering strategies might cause a prevalence of one fiber type (fast-twitch versus slow-twitch) to be more adaptive than another? What will be an ideal response?
The parasympathetic neurons of the autonomic nervous system decrease the rate at which the pacemaker cells of the sinoatrial node drive the heart rate by secreting the neurotransmitter ________.
Fill in the blank(s) with the appropriate word(s).
The presence of water in our bodies allows us to
A. cool the body with sweat. B. maintain a fairly constant body temperature. C. provide an environment for chemical reactions. D. keep tissues moist and reduce friction. E. All of these choices are correct.