The hormone secreted in large amounts by the thyroid gland that contains four iodine ions is __________.
a. calcitonin
b. triiodothyronine
c. thyroglobulin
d. thyroxine
Answer: d. thyroxine
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The endometrium is composed primarily of smooth muscle that thickens under the influence of estrogen
Indicate whether the statement is true or false
Which of the following statements regarding skeletal muscle contraction is true?
A. In every isotonic muscle contraction, the length of the muscle remains constant. B. During a lengthening contraction, the tension exerted by the muscle exceeds the load on the muscle. C. During every muscle contraction, muscle fibers change length. D. During every muscle contraction, tension is developed in the muscle. E. Cross-bridges cycle faster during isometric contractions than during isotonic contractions.
What substance is released from mast cells during an allergic response?
A) antigen B) antibody C) histamine D) complement
Up-regulation of receptors
A) Results in increased sensitivity to its ligand. B) Results in decreased sensitivity to its ligand. C) Occurs when a ligand has been present at high levels. D) Both B and C