The adrenal medulla is important to the sympathetic branch of the autonomic nervous system because
A) it is a source of catecholamines and it is considered a modified sympathetic ganglion.
B) it is a source of catecholamines.
C) it is considered a modified sympathetic ganglion.
D) it is a source of catecholamines, it is considered a modified sympathetic ganglion, and it releases epinephrine and norepinephrine directly into the blood.
E) it releases epinephrine and norepinephrine directly into the blood.
D) it is a source of catecholamines, it is considered a modified sympathetic ganglion, and it releases epinephrine and norepinephrine directly into the blood.
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At the start of gastrulation, a long, thin depression known as the primitive __________ forms on the surface of the epiblast
A. furrow B. node C. streak D. groove E. yolk
Type I alveolar cells
a. form the wall of the alveoli b. secrete pulmonary surfactant c. contract during expiration to force air out of the alveoli d. have characteristics a and c e. have all of the above characteristics
The adrenal gland releases aldosterone in response to
A. ANP and decreased blood plasma sodium levels. B. angiotensin II and increased blood plasma sodium levels. C. angiotensin II and decreased blood plasma sodium levels. D. ANP and increased blood plasma sodium levels.
The only structures that filter lymph is/are the
A. tonsils. B. spleen. C. lymph nodes. D. thymus.