Cardiac muscle tissue
a. has well developed sarcoplasmic reticulum
b. has fast myosin ATPase activity
c. contracts only when stimulated neurogenically
d. has gap junctions
e. stores calcium in its T tubules
D
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Which of the following muscles plays a major role in smiling?
A. Levator labii superioris B. Depressor labii inferioris C. Zygomatic major D. Mentalis E. Orbicularis oris
The major means of increasing heat production in response to a cold environmental temperature is
a. skin vasoconstriction. b. wearing warm clothing. c. increased muscle activity, such as through shivering and increased voluntary exercise. d. formation of "goose bumps." e. increased food intake.
What does the word root "spino" in the name of a spinal tract indicate?
A. Its fibers do not extend beyond the spinal cord. B. It consists of descending fibers. C. It is a motor pathway. D. It is a sensory pathway. E. Its fibers form a spinal nerve.
Sensory receptors in the skin are specialized for touch, pressure, pain, hot, and cold.
Indicate whether the statement is true or false.