In general, as an artery's diameter decreases, the artery walls show
A. a decrease in the relative amount of smooth muscle and an increase in the relative amount of elastic fibers.
B. an increase in the relative amount of smooth muscle and a decrease in the relative amount of elastic fibers.
C. an increase in relative amounts of smooth muscle and elastic fibers and a decrease in endothelium.
D. a decrease in both smooth muscle and elastic fibers and an increase in areolar connective tissue.
B
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Because they both connect to bone on one end, how do wrist ligaments differ from wrist tendons?
A. Wrist ligaments are connected on the other end to muscle. B. Wrist tendons are connected on the other end to muscle. C. Wrist ligaments are connected on the other end to joints. D. Wrist tendons are connected on the other end to joints.
A man enters the hospital complaining of chest pain. His history includes smoking, a stressful job, a diet heavy in saturated fats, lack of exercise, and high blood pressure. Although he is not suffering from a heart attack, his doctor explains to him that a heart attack is quite possible. What did the chest pain indicate? Why is this man a prime candidate for a heart attack?
What will be an ideal response?
Why is it advantageous for organisms not to be aware of all the activity in their nervous systems?
What will be an ideal response?
What is the function of antidiuretic hormone (ADH)?
A. Causes large urine volume B. Stimulates loss of water by the kidneys C. Stimulates retention of water by the kidneys D. Causes a darkening of the skin