The superior portion of the heart where major blood vessels enter and exit is the
A) apex.
B) hilum.
C) base.
D) septum.
E) mediastinum.
C
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Thyroid hormone is somewhat unique in that it is a
A. biogenic amine that is lipid-soluble. B. protein hormone that is water-soluble. C. steroid hormone that is water-soluble. D. steroid hormone that is lipid-soluble. E. monoamine that is water-soluble.
Inborn or intrinsic reflexes are ________
A) involuntary, yet may be modified by learned behavior B) always mediated by the brain C) autonomic only D) rapid, predictable, and can be learned responses
Specialized macrophages called ________ cells are found in the epidermis and mucous membranes.
Fill in the blank(s) with the appropriate word(s).
The main function of carbohydrates is to provide
A. hereditary information. B. cellular energy. C. insulation. D. transport molecules.