The motor neurons of this division of the nervous system are located in the brain stem or ventral horns of the spinal cord and send their axons directly to muscles
A) parasympathetic division of the ANS
B) parasympathetic and sympathetic divisions of the ANS
C) sympathetic nervous system of the ANS
D) somatic nervous system
Answer: D
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You have a large garden with a variety of fruits, vegetables, and flowers, and you have a problem with insects eating them. You decide to use Malathion, an organophosphate insecticide, but you are not terribly careful about protecting yourself as you are spraying. Worried, you decide to look up the action of Malathion and find that it is an acetylcholinesterase inhibitor. Explain how this chemical affects muscle contraction and include where it has its effect and why.
What will be an ideal response?
The hypothalamo-hypophyseal portal system
a. carries anterior pituitary hormones from the anterior pituitary gland to the hypothalamus to regulate the release of hypophysiotropic hormones. b. diverts blood directly to the pituitary, completely bypassing the hypothalamus. c. carries hypophysiotropic hormones from the hypothalamus to the anterior pituitary to regulate anterior pituitary hormone secretion. d. carries the anterior pituitary hormones into the general systemic circulation. e. connects the hypothalamus and posterior pituitary.
Which of these is NOT a muscle that can flex the knee?
a. biceps femoris b. vastus medialis c. gastrocnemius d. gracilis e. sartorius
Why does rigor mortis result in muscular rigidity after death?
A. The enzyme that hydrolyzes ATP is no longer being produced; therefore, the myosin heads will not receive the actin filament. B. The ATP necessary to bind to the myosin head and release the cross bridge is no longer present. C. ATP production is no longer possible; therefore, cross bridges cannot be formed. D. A buildup of intracellular calcium keeps the troponin molecule free of the active site on actin.