Which of the following statements most accurately describes hypoxia?
A. An increase in the amount of dissolved oxygen in plasma or air
B. An increase in the amount of dissolved carbon dioxide in plasma or air
C. A decrease in the amount of dissolved carbon dioxide in plasma or air
D. A decrease in the amount of dissolved oxygen in plasma or air
Ans: D. A decrease in the amount of dissolved oxygen in plasma or air
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Which are characteristic of leukocytes? a: Smaller than erythrocytesb: Have a nucleusc: Have no hemoglobind: More numerous than erythrocytese: Depending on type, may or may not contain granules
A. b, c, d, e B. a, b, e C. b, c, e D. a, b, c, d E. a, b, c, d, e
Plasma cells
a. are not derived from B cells. b. have an expanded rough endoplasmic reticulum. c. do not secrete antibodies but remain dormant and expand the clone specific for the invading antigen. d. are not derived from B cells and have an expanded rough endoplasmic reticulum. e. all of these answers.
During early embryonic development, a protein called sonic hedgehog is released from a cell and travels in a small gradient through the interstitial fluid only to nearby cells. This helps to establish the path and direction of development for the nervous system and limbs. Knowing this, sonic hedgehog must be a(n) ________ signal.
A. nervous B. endocrine C. autocrine D. paracrine
The heart is confined within a double-walled serous membrane sac. The part of the membrane that is in contact with the heart is the ________ layer.
A. serous B. synovial C. parietal D. mesothelial E. visceral