Which of the following molecules is responsible for "runner's high," a good feeling that
accompanies long-distance running?
A) Epinephrine B) Dopamine
C) Beta endorphin D) Acetylcholine
C
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Calcium turns on cross bridges by physically repositioning the troponin-tropomyosin complex to uncover the actin cross-bridge binding sites in
a. skeletal muscle. b. cardiac muscle. c. smooth muscle. d. both skeletal and cardiac muscle. e. all of these answers.
Which of the following is a stimulus for thirst?
A. Salivation B. Decreased plasma volume C. Decreased ECF osmolality D. Sensation of thirst
When trying to diagnose an infection that alters the percentages of leukocyte types found in the blood, it is useful for clinicians to perform a
A. red blood cell differential count. B. total cell count for red and white blood cells. C. white blood cell differential count. D. blood typing.
From the nasal cavity, air passes, in sequence, through the ________ on the way to the lungs.
A. pharynx, trachea, larynx, and bronchi B. pharynx, larynx, trachea, and bronchi C. larynx, pharynx, trachea, and bronchi D. larynx, trachea, pharynx, and bronchi