What are the three levels of nervous system that control movement? Briefly describe their roles.
What will be an ideal response?
1. the spinal cord, which integrates spinal reflexes and contains the central pattern generators
2. the brain stem and cerebellum, which control postural reflexes and hand and eye movements
3. the cerebral cortex and basal ganglia, which are responsible for voluntary movements
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The external urethral sphincter
A. is controlled by the somatic nervous system. B. surrounds the external urethral orifice. C. opens before the internal urethral sphincter during the micturition reflex. D. is composed of smooth muscle fibers. E. All of the choices are correct.
Myasthenia gravis
a. is an autoimmune disease. b. occurs when the terminal-button vesicles are unable to release adequate amounts of acetylcholine. c. can be treated with a drug that temporarily inhibits acetylcholinesterase. d. both (a) and (c) above. e. all of these answers.
Where should a fertilized ovum implant?
A) ampulla of the uterine tube B) vagina C) infundibulum of the uterine tube D) uterus
Fill in the missing blood vessel. aortic arch; _____________; left axillary artery
Fill in the blank(s) with the appropriate word(s).