The brachial region is commonly known as the
A. groin.
B. buttock.
C. breastbone.
D. upper arm.
E. naval.
D
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Biological half-life is the time required for
A. half of an ionic compound to ionize.?B. half of a radioactive material to be eliminated from the body.?C. radioactivity levels of organic compounds to stabilize at one-half their original value. ?D. radiation exposure that is lethal for half of a biological population.
Which statement best describes tendon sheaths?
A) Tendon sheaths protect long tendons as they course over and around synovial joints. B) Tendon sheaths connect one bone to another to strengthen and reinforce articulating bones. C) Tendon sheaths help anchor the tendon to the muscle. D) Tendon sheaths are lined with dense irregular connective tissue.
Which of the following is NOT a true statement about the conduction of action potentials in axons?
A. The inward Na+ current of an AP generates an AP in an adjacent portion of the axon. B. All APs in a given axon are identical in magnitude and duration. C. APs can be conducted in only one direction. D. The velocity of AP conduction is positively correlated with axon diameter. E. The frequency of APs is limited by the length of the refractory period.
Which of the following is false or incorrect?
A) An excitatory postsynaptic potential occurs if the excitatory effect is greater than the inhibitory effect but less than threshold. B) An inhibitory postsynaptic potential occurs if the inhibitory effect is greater than the excitatory, causing hyperpolarization of the membrane. C) A nerve impulse occurs if the excitatory and inhibitory effects are equal.