Which of the following statements is correct?
A) Ligand-gated ion channels change the ion permeability of the membrane, which results in a response by the target cell.
B) Intracellular receptors interact with hydrophilic chemical messengers.
C) Receptor enzymes activate extracellular enzymes.
D) Gprotein-coupled receptors interact with hydrophobic chemical messengers.
Answer: A
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A cell which is more negatively charged than at rest is ________
A) Hyperpolarized B) Polarized C) Refractory D) Depolarized
Enlargement of the adrenal glands is termed:
A) adrenitis B) adrenoma C) adrenomegaly D) adrenalectomy E) adrenalotomy
Which of the following characteristics is not associated with platelets?
a) They contain granules with clotting factors and enzymes. b) They are incapable of oxidative catabolism. c) They are cell fragments. d) They do not have a nucleus.
All of the cell types in the body combine to form ________ primary tissue types. (Note: Be sure to spell out your answer).
What will be an ideal response?