Organophosphates are a group of chemicals that modify neuromuscular junction activity by irreversibly inhibiting what chemical compound?
a. acetylcholine
b. acetylcholinesterase
c. nicotinic acid
d. epinephrine
e. norepinephrine
b
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Brain waves that generally appear during periods of sensory input and mental activity are called
a) alpha waves. b) beta waves. c) theta waves. d) delta waves. e) P waves.
Which of the following determines lung compliance?
A) airway opening B) flexibility of the thoracic cage C) muscles of inspiration D) alveolar surface tension
Semen is
A. produced solely by the testis. B. a vaginal secretion needed to activate sperm. C. sperm cells plus the secretions of accessory glands. D. responsible for engorgement of erectile tissue of the penis. E. is composed only of sperm cells.
Upper motor neurons of the corticobulbar tract synapse with lower motor neurons in the __________.
brainstem basal nuclei posterior horns of the spinal cord anterior horns of the spinal cord