Skeletal muscle fibers in your arm relax because of spinal cord motor neuron inhibition by what neurotransmitter?
A) acetylcholine
B) aspartate
C) nicotine
D) glycine
Answer: D) glycine
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All digestive enzymes have the same optimum pH ranges.
Answer the following statement true (T) or false (F)
The reticular formation is an area of the brain that
A. is sensory in function. B. is motor in function. C. has sensory and motor components. D. serves higher-order cognitive functions.
Exposure to secondhand smoke can cause or increase risk of
A) sarcoidosis, multiple sclerosis, and vasculitis B) high altitude sickness and sleep apnea. C) heart disease, lung cancer, and low birth weight. D) pneumonia and tuberculosis.
Memory B cells do NOT differentiate into plasma cells UNLESS they are __________.
a. stimulated by passive immunization b. exposed to the same antigen a second time c. stimulated by active immunization d. initially subjected to a specific antigen