Explain what is meant by selective permeability in reference to the plasma membrane
What will be an ideal response?
The plasma membrane is a selectively permeable barrier. Selective permeability means that a barrier allows some substances to pass through it while excluding others. The plasma membrane allows nutrients to enter the cell but keeps many undesirable or unnecessary substances out. At the same time, valuable cell proteins and other substances are kept within the cell, and wastes are allowed to pass out of it.
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Vitamin K stimulates the liver to increase production of:
a. prothrombin activator b. fibrinogen c. prothrombin d. thrombin
The cells that rhythmically and spontaneously generate action potentials in the heart are called __________.
Fill in the blank(s) with the appropriate word(s).
Most of the posterior forearm muscles have what action on the wrist and fingers?
a. Flexion b. Pronation c. Extension d. Rotation
Postmenopausal women are at increased risk, compared to premenopausal women, for osteoporosis and atherosclerosis.
Answer the following statement true (T) or false (F)