Which is a characteristic of apocrine sweat glands but not eccrine sweat glands?
A) Found on the hands and feet
B) Open into hair follicles
C) Located in the epidermis
D) Function to regulate body temperature
Answer: B
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Sinoatrial (SA) node cells:
a. reach threshold only when action potentials generated by the AV node arrive through gap junctions. b. exhibit spontaneous depolarization that is speeded by activation of their muscarinic-cholinergic receptors. c. exhibit spontaneous depolarization that is accelerated by way of activation of their beta-adrenergic receptors. d. exhibit a steep upstroke due to the presence of the same type of Na+ channels found in neuronal membranes. e. are in-between atrial muscle cells and cells of the bundle of His.
What principle causes the exchange of oxygen and carbon dioxide between the capillaries and the alveoli?
A. Diffusion B. Absorption C. Secretion D. Active transport E. Filtration
A muscle that decreases the size of an opening is a
a) rotator. b) tensor. c) pronator. d) sphincter. e) depressor.
Each germ layer develops into specific structures. The nervous system develops from the _______
Fill in the blank(s) with the appropriate word(s).