Identify the correct statement(s) about digestive enzymes made by the small intestine
a. They are secreted into the intestinal lumen, where they perform their function
b. They act intracellularly within the brush border
c. They complete the digestion of carbohydrates
d. Both a and c
e. Both b and c
E
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Which of the following is true of megakaryocytes?
A. They give rise to macrophages. B. They give rise to platelets. C. They secrete histamine. D. They aggregate to plug tears in blood vessels. E. They are small (no larger than 2 to 4 mm in diameter).
The primary purpose of the blood-brain barrier is to
A) hook areas of the brain together. B) drain blood from the brain. C) isolate the CNS from general circulation. D) provide the brain with oxygen. E) None of the answers are correct.
Nearly all fish and shellfish contain methyl mercury.
a. true b. false
The swallowing center is located in the ________.
A. mouth B. enteric nervous system C. medulla oblongata D. oropharynx E. esophagus