The cells of the endocrine and nervous systems work together to
A) affect target organs, which are restricted to nerve, gland, muscle, and fat cells.
B) provide long-lasting effects on a systemic basis.
C) monitor and adjust physiological activities in the body at any given moment.
D) provide widespread physiological effects throughout the body.
E) provide gradual onset of the systemic effects.
C) monitor and adjust physiological activities in the body at any given moment.
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Cardiac muscle fibers are joined by special gap junctions called intercalated discs; these discs allow heart activity to be closely coordinated
Indicate whether the statement is true or false
The frequency of action potentials generated by the SA node is:
A. increased by parasympathetic stimulation. B. decreased by sympathetic stimulation. C. increased by acetylcholine. D. increased by epinephrine. E. increased by an increase in blood pressure.
Many people over age forty require reading glasses or bifocals because of
A. elongation of the eye. B. loss of lens elasticity. C. dehydration astigmatism. D. weakening of the iris. E. corneal clouding.
Contrast chemically gated and voltage-gated channels. How do their functions differ? In which segments of a neuron are they found?
What will be an ideal response?