The major histocompatibility complex
a. was first observed in virally infected fish.
b. is a group of cells responsible for presenting antigens to B-cells to stimulate antibody production.
c. is a cluster of genes which encode self-antigens.
d. is the membrane glycoprotein and associated antigen presented to B-cells.
e. none of these.
C
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Which statement regarding control of pancreatic secretion is correct?
a. Gastrin stimulates release of a substance that neutralizes acid. b. CCK stimulates release of enzymes. c. Secretin stimulates release of bicarbonate. d. All of the above are correct. e. Only b and c are correct.
Which is greater?
A) osteoclast activity when calcitonin is present B) osteoclast activity when calcitonin is absent
List, and briefly define, the human body's organization levels from smallest to largest
What will be an ideal response?
Water moves back and forth across the plasma membrane by the process of
A. osmosis. B. filtration. C. facilitated diffusion. D. active transport. E. endocytosis.