Which of the following statements is NOT true of the endocrine system?
A. It influences and is influenced by the nervous system.
B. Most of its components are anatomically connected, like most other systems of the body.
C. It is composed of glands that secrete chemical messengers into the blood.
D. It is one of two major regulatory systems of the body.
E. It is an important regulator of homeostatic mechanisms.
Answer: B
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During muscle contraction, all of the following occur, except
A) ATP is hydrolyzed. B) Myosin heads bind to actin. C) The H band becomes shorter. D) Calcium concentration in the sarcomere increases. E) Hemoglobin concentration in muscle fibers increases.
Which artery supplies the gallbladder?
A. Cystic artery B. Splenic artery C. Left gastric artery D. Left hepatic artery E. Gastro-omental artery
The failure of interhemispheric transfer of information in a split-brain patient is best demonstrated by:
A. having him use both hands for a task B. covering one eye during a task requiring eye-hand coordination C. asking him to identify an object placed to his left D. asking him to identify an object placed in his left hand E. asking him to identify an object placed in his right hand
In pregnant women, the high levels of estrogen and progesterone secretion seem to lead to
A. stronger nails and fuller hair. B. weaker nails and thinner hair.