In people who stand for long periods, blood tends to pool in the lower limbs, and this may result in varicose veins. What causes the varicose veins?
A. Failure of the lymphatic valves
B. An aneurysm or weak point in an artery
C. An aneurysm or weak point in a vein
D. A ruptured aneurysm in a vein
E. Failure of the venous valves
Answer: E
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A) decreases with increasing length of the blood vessel B) increases as blood vessel diameter increases C) increases as blood viscosity increases D) is not a major factor in blood pressure in healthy individuals
Ions directly regulated by the kidney include all EXCEPT which of the following?
A) OH- B) Ca2+ C) K+ D) Na+ E) HCO3-
Releasing hormones directly affect:
A) the hypothalamus B) the anterior pituitary C) the posterior pituitary D) the ovaries and testes E) it depends on which releasing hormone you are talking about
This part of the brain is responsible for autonomic motor functions such as respiration, blood pressure, and heart rate, as well as for regulating muscle tone.
A. Sensory component of the reticular formation B. Prefrontal cortex C. Hypothalamus D. Motor component of the reticular formation E. Amygdala