What is the general purpose of positive feedback mechanisms?
A. To detect changes in the external environment
B. To bring about a rapid change in the body
C. To maintain a constant internal environment
D. To return a variable toward the set point
E. To anticipate changes in the environment
Answer: B
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________ is a condition in which chronic low levels of oxygen (due to lung disease or living in high altitudes) cause the body to produce higher than normal amounts of erythrocytes to more efficiently transport the smaller amounts of available oxygen.
A. Primary polycythemia B. Primary erythrocytopenia C. Secondary polycythemia D. Secondary erythrocytopenia
Which of the following minerals is NOT correctly matched with its major function?
A. Sodium - needed for nerve impulse transmission B. Calcium - building strong bones and teeth C. Chloride - aids in acid-base balance D. Iodine - helps wounds to heal
Blood in the umbilical arteries is well oxygenated, whereas that in the umbilical vein is poorly oxygenated.
Answer the following statement true (T) or false (F)
The groove separating the greater and lesser tubercles of the humerus is the ____________________ groove.
Fill in the blank(s) with the appropriate word(s).