Action potentials at a chemical synapse
A. travel from presynaptic terminal to postsynaptic membrane.
B. travel from postsynaptic membrane to presynaptic terminal.
C. travel back and forth from presynaptic terminal to postsynaptic membrane.
D. travel from presynaptic terminal to presynaptic membrane.
E. stop at the presynaptic terminal and are regenerated on the postsynaptic membrane.
D
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Tamoxifen is a breast-cancer drug that binds to the estrogen receptor. When in the body, tamoxifen binds to the estrogen receptor for much longer than the patient's own estrogen. Tamoxifen stays bound for so long that it prevents the binding of circulating estrogen to its receptor. Tamoxifen must have a higher ________ for the estrogen receptor than estrogen.
A. specificity B. accommodation C. inhibition D. saturation E. affinity
Negative feedback is bad for the body because it increases a change away from normal
Indicate whether the statement is true or false.
The ____________________ is a flap of cartilage that prevents food and liquids from entering the trachea during swallowing.?
Fill in the blank(s) with correct word
Of the following muscles, which one has its origin on the pubic bone and its insertion on the posterior surface (linea aspera) of the femur?
A) adductor longus B) psoas major C) iliacus D) vastus medialis