Where in the diagram can you find red bone marrow in an adult?
a) D
b) A and B
c) A and C
d) C
e) E
b
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If we were able to artificially alter the membrane permeability of pacemaker cells so that sodium influx is more rapid, ________.
A) threshold is reached more quickly and heart rate would increase B) potassium channels compensate and no change in heart rate would occur C) heart rate would decrease, but blood pressure would rise due to the excess sodium present D) tetanic contraction would occur due to the short absolute refractory period of cardiac muscle
Underneath the endothelium of arteries is a layer of
A) collagen fibers. B) adipose tissue. C) elastic fibers. D) smooth muscles. E) None of the answers are correct.
How do glucocorticoids enable the body to deal appropriately with stress?
A) by increasing blood glucose, fatty acid, and amino acid levels and enhancing blood pressure B) by stimulating the pancreas to release insulin C) by releasing the neurotransmitters that prepare the body for the stress response D) by decreasing the heart rate, thus decreasing blood pressure
Hyposecretion of hormones from the adrenal cortex leads to
A) Addison disease. B) moon face. C) Cushing syndrome. D) buffalo hump.