The life span of a red blood cell is 100 to 120 days
Indicate whether the statement is true or false
TRUE
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Which of the following statements concerning control of blood flow through arterioles is TRUE?
A. Beta-adrenergic receptors are more abundant on most arteriolar smooth muscle than are alpha-adrenergic receptors. B. Binding of epinephrine to alpha-adrenergic receptors causes vasodilation. C. Increased stimulation of vascular smooth muscle by the parasympathetic nervous system causes increased vasoconstriction. D. If the arterial blood pressure to an organ suddenly decreases, arterioles in the organ will dilate in response. E. Body-wide constriction of arterioles results in a decrease in the total peripheral resistance (TPR).
Which of the following is not characteristic of neurons?
A) They have an exceptionally high metabolic rate. B) They conduct impulses. C) They have extreme longevity. D) They are mitotic.
Normal venous PCO2 is ________.
A. 46 mm Hg B. 40 mm Hg C. 105 mm Hg D. 100 mm Hg
Both ________ and ________ catalyze the hydrolysis of proteins to form peptides.
A. pepsin; trypsin B. pepsin; peptidase C. pepsin; rennin D. trypsin; peptidase