What is internal respiration?
A. Ventilation (breathing)
B. Gas exchange between air and blood
C. Production of ATP
D. Gas exchange between blood and tissue fluid
Answer: D
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Mechanisms that do not help regulate blood pressure include ________.
A) nervous control that operates via reflex arcs involving baroreceptors, chemoreceptors, and higher brain centers B) the dural sinus reflex C) renal regulation via the renin-angiotensin system of vasoconstriction D) chemical controls such as atrial natriuretic peptide
The _____ plane divides the body into front and back portions.?
A) ?coronal B) ?sagittal C) ?transverse
A malfunction of the process of keratinization results in the condition known as ________.
A. impetigo B. acne C. jaundice D. cyanosis E. psoriasis
Why are action potentials sometimes described as being "all-or-none" in character?
A. The rate of propagation of an action potential down an axon is independent of stimulus strength. B. They are associated with an absolute refractory period. C. A supra-threshold stimulus is required to stimulate an action potential during the relative refractory period. D. An action potential occurs whenever a suprathreshold stimulus occurs, and its amplitude does not vary with the size of a stimulus, as long as the membrane is not in the refractory period. E. Action potentials are always the same size, even when ion gradients vary in size.