The chemical behavior of an atom is determined by the
A) number of protons.
B) number of neutrons.
C) outermost electron shell.
D) size of the atom.
E) mass of the nucleus.
Answer: C
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In the renin-angiotensin-aldosterone pathway that regulates blood pressure, renin is controlled in the following ways EXCEPT
A) Juxtaglomerular cells themselves can sense pressure changes and release renin when blood pressure declines. B) Decreases in blood pressure activate sympathetic neurons in the medulla oblongata, triggering renin secretion. C) Macula densa cells in the wall of the distal tubule respond to a decrease in urine flow and Na+ delivery by releasing a paracrine signal that leads to renin secretion. D) Decreased perfusion of the lung leads to the production of angiotensin-converting enzyme, or ACE, that directly leads to renin secretion.
When people experience conditions of high environmental temperatures and humidity,
A) they can become hydrated from absorbing water vapor from the air. B) their bodies are cooled primarily by the merocrine sweat glands. C) even if they do not overexert they will have sore muscles and feel tired. D) they feel increasingly energetic as their skin surface becomes warmer. E) None of the answers are correct.
Metabolism includes:
a. anabolism and assimilation b. catabolism and nutrition c. anabolism and catabolism d. nutrition and assimilation
A mean arterial pressure below 60 mmHg can cause which of the following?
A) Cerebral edema B) Cardiogenic shock C) Compensated shock D) Syncope E) Neurogenic shock