Which of the following muscles adducts and medially rotates the thigh?
A. Piriformis
B. Rectus femoris
C. Gracilis
D. Adductor magnus
E. Sartorius
Answer: D
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The movement of protein molecules within the phospholipid bilayer is described by the
A. cholesterol mosaic model. B. protein-lipid mosaic model. C. fluid mosaic model. D. lipid mosaic model.
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.
Which of the following is not a characteristic of enzymes?
A. They speed up the rate of chemical reactions but are not used up in the process. B. They are most active at temperatures above 53 degrees C. C. Most are proteins. D. They have active sites and interact with specific substrates.