Catecholamines:
a. are derived from cholesterol
b. are secreted by the adrenal medulla
c. include epinephrine as the major hormone
d. include estrogen and testosterone
e. are lipophilic
B
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Which of the cranial meninges consists of dense irregular connective tissue in two layers (the periosteal layer and the meningeal layer)?
A. Arachnoid B. Subarachnoid layer C. Subdural layer D. Dura mater E. Pia mater
A significant change in vertebrate hearts began when
a. the ancestors of whales returned to the oceans. b. flight evolved in birds. c. reptiles moved onto land. d. air-breathing fish evolved. e. amphibians transitioned to life on land and in water.
Which of the following conditions would cause an increase in the heart rate?
A) activation of the parasympathetic nervous system B) acetylcholine stimulation of nodal cells and contractile cells C) activation of the sympathetic nervous system D) decreased blood concentration of carbon dioxide and increased blood pressure E) decreased blood concentration of oxygen and increased blood pressure
Bone remodeling may occur
A. as bones grow. B. as bones adjust to stress. C. as fractures heal. D. constantly during a person's lifetime. E. All of these choices are correct.