Lymphocytes
A. migrate to lymphatic tissue.
B. release heparin.
C. are the largest of the leukocytes.
D. produce histamine.
E. are phagocytic.
Answer: A
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Receptors that work through second messenger systems are called ________ receptors.
Fill in the blank(s) with the appropriate word(s).
Which dietary supplement is most likely to contribute to greater skeletal muscle ATP availability in the first few seconds of skeletal muscle contraction?
A. Protein B. Creatine C. Sports drinks with electrolytes D. Fatty acids E. Sugar
During muscle contraction, what becomes smaller?
a. H zone b. thin filaments c. the width of the A band d. thick filaments e. myosin molecules
In the digestive system, autonomous smooth muscle activity
a. involves slow-wave potentials. b. involves a basic electrical rhythm initiated by pacesetter cells. c. is initiated by the interstitial cells of Cajal. d. is initiated by cells in the boundary between circular and longitudinal muscle. e. all of these.