Smoking affects the cardiovascular system in all of the following ways except
What will be an ideal response?
lowering the heart rate
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In order to retain heat, what occurs in the skin on a cold day?
A. Blood vessels of the epidermis dilate. B. Blood vessels of the dermis constrict. C. Blood vessels of the dermis dilate. D. Blood vessels of the epidermis constrict.
Steroid hormones
A) are proteins. B) cannot diffuse through cell membranes. C) bind to receptors in the nucleus of their target cells. D) act on target cells by activating second messenger cascades. E) are transported in the blood dissolved in the plasma.
The final equilibrium state reached by a molecule that enters a cell by facilitated diffusion is the same as that for a molecule that enters the cell by diffusion
Indicate whether the statement is true or false.
The layer directly under the skin is called the ________.
A. epidermis B. dermis C. hyperdermis D. subcutaneous tissue