The effective plasma concentration of a hormone is normally regulated by appropriate adjustments in the hormone's rate of
a. excretion
b. binding to plasma proteins
c. metabolic inactivation
d. secretion
e. binding with target-cell receptors
D
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Although extremely painful, injuries to the ________ spine are typically neurologically insignificant.
A) lumbar B) coccygeal C) thoracic D) cervical
Which of the following best differentiates between the endoneurium and myelin?
A. Endoneurium is more complex because it is composed of connective tissue; whereas myelin is composed of individual cells. B. Myelin is composed of epithelial tissue, while endoneurium is composed of connective tissue. C. Myelin and endoneurium are essentially the same thing, a connective tissue covering surrounding axons of neurons. D. Myelin is more complex as it is composed of multiple cells surrounding a neuron; whereas the endoneurium is simply connective tissue.
Which is TRUE about neuronal membrane electrical and concentration gradients at the peak of the action potential?
A. The electrical gradient is in a direction that would tend to move K+ out of the cell. B. The concentration gradient for K+ is in a direction that would tend to move it into the cell. C. The concentration gradient for K+ greatly increases compared to at rest. D. The concentration gradient for Na+ is in a direction that would tend to move it out of the cell. E. The electrical gradient for Na+ is in a direction that would tend to move it into the cell.
The ________ cells support, nourish, and protect developing sperm cells.
Fill in the blank(s) with the appropriate word(s).