Connective tissue fibers are formed from protein subunits secreted by
A) macrophages.
B) adipocytes.
C) fibroblasts.
D) antibody-producing cells.
E) mast cells.
C) fibroblasts.
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Presynaptic facilitation makes a pathway
A) less likely to be in use, just through hyperpolarization of selected neurons and capable of alteration, just through training and conditioning. B) more likely to be in use, just through depolarization of selected neurons and capable of alteration, just through training and conditioning. C) more likely to be in use, just through depolarization of selected neurons. D) less likely to be in use, just through hyperpolarization of selected neurons. E) capable of alteration, just through training and conditioning.
Identify the true statement(s) about the plasma membrane
a. Its lipid region allows most ions to diffuse between the cytosol and ECF. b. Its channels allow cholesterol to diffuse between the ECF and cytosol. c. Some of its carriers transport sodium. d. Its phospholipids are held to one another by CAMs. e. All except its phospholipids are held to one another by CAMs.
The volume of blood pumped out by each ventricle with each beat of the heart is called the ________
A) cardiac output B) cardiac cycle C) stroke volume D) heart rate E) diastolic pressure
In a negative feedback mechanism, the response of the effector
A. reverses the original stimulus. B. enhances the original stimulus. C. has no effect on the original stimulus. D. is usually damaging to the body. E. creates a cycle that leads away from homeostasis.