Active hyperemia refers to
a. arteriolar dilation in response to local chemical changes that accompany increased metabolic activity of the tissue
b. local arteriolar mechanisms that are aimed at keeping tissue blood flow fairly constant in spite of wide deviations in mean arterial driving pressure
c. the increase in blood flow to a tissue that occurs after removal of an occlusion of its blood supply
d. maintaining adequate mean arterial pressure to drive blood forward into a tissue
e. none of the above
A
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Which of these would increase the tension generated in a skeletal muscle?
A. Stretching the muscle to very long lengths B. Switching off fast-glycolytic motor units and activating an equal number of slow-oxidative motor units C. Increasing the frequency of firing in alpha motor neurons innervating the muscle D. Resting the muscle for several weeks E. Increasing the amplitude of action potentials in the alpha motor neurons that innervate the muscle
Animals mediate the effects of steroid hormones by altering the
A) Rates of hormone synthesis. B) Levels of target tissue receptors. C) Rates of degradation. D) All of the above
Histamine and leukotrienes are released from ________.
A. basophils and mast cells B. neutrophils and lymphocytes C. eosinophils and basophils D. macrophages and microphages E. phagocytes
The time during which an excitable membrane cannot respond to further stimulation regardless of the stimulus strength is the ________.
Fill in the blank(s) with the appropriate word(s).