A light skinned person may appear pink when they become over heated. The best explanation for this is ________
A) the blood vessels of the dermis have undergone vasodilation, bringing a greater volume of blood to the skin
B) the heart is pumping faster because the person was probably exercising
C) blood flow has increased to the sweat glands in order to increased their metabolic activity
D) the melanocytes are responding to the heat of the sun and change the appearance of the skin with increased production
A
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As a result of stress the adenohypophysis releases ________, which stimulates release of hormones from the adrenal cortex that retain sodium and water, increase blood sugar, and begin breaking down fats.
Fill in the blank(s) with the appropriate word(s).
Simple diffusion is best described as substances __________.
A)moving actively against a concentration gradient B)moving passively against a concentration gradient C)moving passively down a concentration gradient D)moving actively down a concentration gradient
The terms supine and prone have opposite meanings.
Answer the following statement true (T) or false (F)
What part of the brain modifies the activity of upper motor neurons to produce voluntary movements and inhibit involuntary ones?
A) premotor cortex B) basal nuclei C) primary motor cortex D) cerebellum