Which of the following describes the layering, in order from top to bottom, of a test tube of blood that has been “spun down” in a centrifuge?
a. plasma, red blood cells, buffy coat
b. buffy coat, plasma, red blood cells
c. plasma, buffy coat, red blood cells
d. red blood cells, buffy coat, plasma
c. plasma, buffy coat, red blood cells
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Which cells aid in the body's defense processes by secreting histamine and heparin?
A. Basophils B. Eosinophils C. Platelets D. Neutrophils E. Monocytes
Which effectors of the PNS are served by somatic motor nerves?
A. Skeletal muscle B. Cardiac muscle C. Smooth muscle D. Glands
Certain odors can initiate behavioral and emotional reactions because
A. the olfactory pathway is connected directly to the occipital lobe. B. olfactory sensations are interpreted at the prefrontal cortex. C. there are widespread olfactory associations within the hypothalamus and limbic system. D. the olfactory pathway is connected directly to the medulla oblongata. E. the sense of olfaction occurs immediately at the olfactory epithelium.
Intercalated discs couple ________ cells both mechanically and electrically.
A. skeletal muscle B. smooth muscle C. myocardial D. both myocardial and skeletal muscle