The protein whose removal enables myosin to bind actin in smooth muscle is
a. tropomyosin.
b. caldesmon
c. myosin light chain kinase
d. calmodulin
e. synapsin
B
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Match the following with its description.
1. parasympathetic tissue receptor 2. target receptor for preganglionic neurons 3. released by all autonomic preganglionic neurons 4. primary sympathetic neurotransmitter 5. sympathetic tissue receptor A. acetylcholine B. norepinephrine C. cholinergic nicotinic receptor D. adrenergic receptor E. cholinergic muscarinic receptor
Which of the following correctly lists the arrangement of components found in a third-class lever?
A. Weight-fulcrum-pull B. Fulcrum-weight-pull C. Fulcrum-pull-weight
These collagen fibers help to connect ligaments and tendons to the periosteum of the bone
A. Purkinje fibers B. Golgi fibers C. Sharpey fibers D. Haversian fibers E. endosteal fibers
________ is characterized by a decrease in blood Ca2+ level, which may result in cardiac arrest and tetany of skeletal muscles.
A. Hypoparathyroidism B. Cushing syndrome C. Addison disease D. Hyperthyroidism E. Hyperparathyroidism