Once threshold potential has been achieved, the permeability of the membrane to Na+ is
a. greater than it was at rest.
b. greater than its permeability to K+.
c. increased due to activation of voltage-gated Na+ channels.
d. all of these.
e. none of these.
D
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Slow-oxidative muscle fibers have high resistance to fatigue
Indicate whether the statement is true or false
List the accessory organs of the digestive system
A) oral cavity, teeth, tongue, salivary glands, esophagus B) oral cavity, salivary glands, esophagus, stomach, liver C) teeth, tongue, salivary glands, liver, gallbladder, pancreas D) teeth, tongue, stomach, liver, gallbladder, large intestine E) pharynx, esophagus, stomach, liver, gallbladder, pancreas
The main function of serous fluid is to
A. facilitate the diffusion of oxygen across the respiratory membrane. B. improve adhesion of the lungs to the thoracic wall. C. lubricate and reduce friction between pleural membranes around the lung.
When oxygen binds with hemoglobin, the molecule is called _____________
Fill in the blank(s) with the appropriate word(s).