which describes the action of the diaphragm when it contracts?
a) during expiration, it depresses and retracts the ribs
b) during expiration, it elevates the floor of thorax
c) during inspiration, it depresses the floor of thorax
d) during inspiration, it elevates and protracts the ribs
c) during inspiration, it depresses the floor of thorax
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The heart muscle is a ________ effector
A) somatic B) sympathetic C) visceral D) afferent E) higher-order
Breathing muscles such as the diaphragm are controlled by neurons of the _________ nervous system
A. somatic B. autonomic C. enteric
A solution consists of a ________ which dissolves the ________.
A. solvent, solid B. solute, solvent C. liquid, solid D. solvent, solute
The spleen filters ________; lymph nodes filter ________.
A. lymph; lymph B. blood; lymph C. lymph; blood D. blood; blood