Epinephrine and norepinephrine are secreted by the
A) Adrenal cortex.
B) Chromaffin cells.
C) Heart.
D) Kidneys.
Answer: B
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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).
An excitatory neurotransmitter _____ the postsynaptic membrane
a) depolarizes b) repolarizes c) hyperpolarizes d) does not affect the polarity of e) moves across channels in
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
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