Which of the following is NOT an aging effect of the lymphatic system and immunity?
A. T cell numbers remain constant, but they are less functional.
B. Onset of autoimmune diseases is unchanged.
C. Fewer antibodies are produced.
D. Fluid removal by the lymphatic capillaries is reduced.
Answer: D
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Which of the following statements is true of the Magnus force?
A. It is created by spin on a ball. B. It is created by a pressure differential. C. Both A and B are true. D. Neither A nor B is true.
The glomerular capillary blood pressure is higher than capillary pressure elsewhere in the body, primarily because the afferent arteriole has a larger diameter than the efferent arteriole
Indicate whether the statement is true or false
Which of the following is involved in the gradation of muscle contraction?
a. variation in the number of motor units activated b. variation in the frequency of action potentials initiated in each muscle fiber c. variation in the size of the action potentials initiated in each muscle fiber d. both (a) and (b) above. e. all of these answers.
Norepinephrine and epinephrine open ________ channels inducing a faster diastolic depolarization.
A. HCN B. fast Ca2+ C. voltage-gated Ca2+ D. fast Na+