The venous valves
a. actively contract to force blood uphill against gravity
b. passively close to prevent the backflow of blood in the veins
c. prevent blood from flowing into lymphatic vessels
d. primarily prevent blood plasma from moving into the interstitial fluid
e. perform all of the above functions
B
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Thyroid hormone (a small iodinated amine) enters target cells in a manner similar to ________.
A) insulin, because insulin is a small peptide B) steroid hormones, because both diffuse easily into target cells C) growth hormone, because the thyroid works synergistically with thyroid hormone D) glucagon, because the structure of glucagon is similar to that of thyroid hormone
____________ contain enzymes that digest material taken into the cell
Fill in the blank(s) with correct word
Elizabeth has been diagnosed with a gastric ulcer. Carl has been diagnosed with a duodenal ulcer. Both of them are
A. caused by removal of the gallbladder. B. treated by interventions that inhibit digestive enzymes. C. treated by interventions that inhibit acid secretion. D. found in the large intestine. E. caused by hypersecretion of gastric acid.
A prime mover (agonist) ________
A) aids the action of the muscle primarily responsible for the movement B) immobilizes the origin of the prime mover C) opposes or reverses a movement D) is primarily responsible for a movement