A neuron's membrane contains more potassium leak channels than sodium leak channels.
Answer the following statement true (T) or false (F)
True
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The link between the hypothalamus, pituitary gland, and some endocrine glands—in which low levels of hormone signal the hypothalamus to secrete more releasing factor, which in turn signals the pituitary gland to secrete stimulating hormones, resulting in increased hormone levels—is called a
a. feedback stimulation mechanism b. negative feedback loop. c. positive feedback loop. d. connected feedback loop.
If you add a single cholesterol molecule into the plasma membrane, do you expect that, several hours later, it will be in the same place (i.e., adjacent to the same exact phospholipid molecules).
A. Cholesterol will migrate away from phospholipids and toward proteins. B. Cholesterol will associate with adjacent phospholipid molecules and stay near them. C. Cholesterol will be excluded from the bilayer and will no longer be associated with phospholipids because they have different properties. D. All of the molecules will move freely in the lipid bilayer.
Muscle fibers develop tension by
a. contraction of sarcomeres b. shortening c. the pushing of myosin by actin d. all of the above e. both a and b
All visual pigments contain __________ derived from __________.
-retinal; vitamin A -rhodopsin; vitamin A -retinal; vitamin D -rhodopsin; vitamin D