Which of the following is likely during vigorous exercise?
A) Blood will be diverted to the digestive organs.
B) The skin will be cold and clammy.
C) Capillaries of the active muscles will be engorged with blood.
D) Blood flow to the kidneys increases.
C) Capillaries of the active muscles will be engorged with blood.
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The posterior interventricular sulcus
A. is another name for the coronary sulcus. B. contains the great cardiac vein and coronary sinus. C. is a groove between the ventricles on the back of the heart. D. is a valve in the interventricular septum that closes at birth.
Which of the following is not a foramen or fissure in the sphenoid bone?
A) superior orbital B) rotundum C) ovale D) lacerum E) spinosum
Select the correct statement about the summation of simple twitches
a. They can occur because of the long duration of the action potential in a muscle fiber. b. They reduce the tension in a muscle. c. They result from the slow stimulation of a muscle fiber. d. The effect is unrelated to the refractory periods of action potentials. e. The twitches resulting from separate action potentials.
Puberty is initiated when a region of the brain begins secreting
A. follicle-stimulating hormone. B. gonadotropin-releasing hormone. C. luteinizing hormone. D. estrogen or testosterone. E. androgens.