Epinephrine and norepinephrine are secreted by the

A) Adrenal cortex.
B) Chromaffin cells.
C) Heart.
D) Kidneys.


Answer: B

Anatomy & Physiology

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Lymphatic capillaries are held in place by ________ filaments that attach the endothelial cells to nearby structures.

Fill in the blank(s) with the appropriate word(s).

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An excitatory neurotransmitter _____ the postsynaptic membrane

a) depolarizes b) repolarizes c) hyperpolarizes d) does not affect the polarity of e) moves across channels in

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In infants, which muscle allows for the mouth to form a tight fit around the nipple during suckling at the breast?

A) masseter B) buccinator C) orbicularis oris D) risorius E) levator labii

Anatomy & Physiology

Name the ion that commonly serves as a cofactor for intracellular enzymes, such as the sodium-potassium pump

A. Magnesium B. Calcium C. Hydrogen D. Carbonate E. Phosphate

Anatomy & Physiology