Myasthenia gravis is a collection of muscle disorders that cause muscle fatigue and weakness. What is the major mechanism?
A. Autoimmune destruction of L-type Ca2+ channels.
B. Overproduction of acetylcholinesterase
C. Autoimmune destruction of nicotinic acetylcholine receptors
D. Demyelination of axons in motor pathways
E. A tumor that overproduces acetylcholine
Answer: C
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Reticular fibers in soft organs like the spleen and liver form a supporting framework called the
a) matrix. b) ground substance. c) basement membrane. d) stroma. e) glycosaminoglycans.
If cells are placed in a hypertonic solution containing a solute to which the membrane is impermeable, what could happen?
A) The cells will swell and ultimately burst. B) The cells will lose water and shrink. C) The cells will shrink at first, but will later reach equilibrium with the surrounding solution and return to their original condition. D) The cells will show no change due to diffusion of both solute and solvent.
Ducts from which of the following open into the mouth behind the teeth on either side of the lingual frenulum?
A) sublingual salivary glands B) pancreas C) submandibular salivary glands D) parotid salivary glands E) lingual salivary glands
The outer region of the adrenal gland is called the __________.
What will be an ideal response?