Which of the following is not accomplished by thrombin?
a. stimulates conversion of fibrinogen to fibrin
b. activates tissue thromboplastin, which initiates the extrinsic clotting pathway
c. activates factor XIII (fibrin-stabilizing factor)
d. enhances platelet aggregation
e. acts in positive-feedback fashion to facilitate its own formation
B
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Name the substance that protects the DNA of rapidly dividing skin cells from the damage caused by ultraviolet rays from the sun
A) carotene B) melanin C) hemoglobin D) keratin
A patient with diaphragmatic breathing without intercostal muscle use has MOST likely experienced a spinal injury above the level of:
A) C2. B) C5. C) C7. D) T2.
Where in the figure is the periosteum located?
a) A b) C c) D d) E e) G
To initiate a cardiac muscle cell contraction, calcium
A. binds to calmodulin. B. binds to troponin. C. binds to actin. D. binds to the Z-disc. E. binds to tropomyosin.