Label L represents which of the following structures?
A) renal papilla
B) renal columns
C) renal pyramid
D) major calyx
E) minor calyx
D) major calyx
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Which valve is closed during heart relaxation to prevent blood from backflowing from the aorta into the heart?
A) bicuspid (mitral) valve B) tricuspid valve C) pulmonary semilunar valve D) aortic semilunar valve
Type 1 diabetes mellitus is caused by
A. an effect of aging. B. obesity. C. a disorder of the immune system. D. excess sugar in the diet.
The reactions of the Krebs cycle:
A. take place in the cytosol of human cells. B. generate ATP directly by substrate-level phosphorylation. C. are important for the metabolism of carbohydrates but not other molecules. D. take place only when no oxygen is present. E. produce pyruvate and lactate as end products.
Myelination increases AP conduction velocity by:
A. increasing the axonal diameter B. increasing membrane capacitance C. limiting voltage-gated K+ channels to the nodes D. increasing the velocity of current flow in the axon E. increasing the length constant and decreasing the membrane capacitance between the nodes