Which cell type produces heparin and histamine to promote inflammation in the connective tissues when necessary?
A. Fibroblasts
B. Erythrocytes
C. Chondroblasts
D. Osteoblasts
E. Mast cells
Answer: E
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What do human cells require to carry out energy-yielding chemical reactions?
a. oxygen b. carbon dioxide c. salt d. ATP molecules e. sunlight
When the available enzymes in a reaction become saturated, one would expect that in increasing the amount of substrate
The reaction would take place more slowly The reaction would take place more quickly There would be no effect on enzymatic reactions
The release of hormones by endocrine cells alters the ______
a. very specific responses to environmental stimuli b. rate at which chemical neurotransmitters are released c. anatomical boundary between the nervous and endocrine systems d. metabolic activities of many tissues and organs simultaneously
The result of five turns of the citric acid cycle would be
A. 5 ATP, 5 NADH, 5 FADH2, 5 carbon dioxide. B. 5 ATP, 15 NADH, 5 FADH2, 10 carbon dioxide. C. 10 ATP, 30 NADH, 10 FADH2, 20 carbon dioxide. D. 10 ATP, 10 NADH, 5 FADH2, 10 carbon dioxide. E. 15 ATP, 15 NADH, 15 FADH2, 15 carbon dioxide