Which of the following is not an activity which prevents food from entering the trachea or nasal passage?
a. inhibition of respiration
b. elevation of the larynx
c. positioning of the tongue against the hard palate
d. contraction of the pharyngeal muscles
e. elevation of the uvula
D
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What is perforin?
A) a type of antibody synthesized by B cells B) a protein produced by NK cells C) a type of interferon D) a toxin expressed by some pathogens that is capable of damaging healthy cells E) a destructive enzyme secreted by sebaceous glands
With the type of lever system exemplified by flexion of the elbow joint, when an object is held in the hand, the
a. power arm of the lever is the distance between the elbow joint and the insertion of the biceps muscle b. load arm of the lever is the distance between the elbow joint and the hand c. velocity and distance moved by the hand is amplified at the expense of the biceps muscle having to exert considerably greater force than the actual load that is moved d. answers a, b, and c are correct e. answers a and b are the only correct answers
Where are the neurons for the autonomic nervous system located?
A. Corpus callosum B. Spinal cord and brain stem C. Cerebral cortex D. Inside neurotransmitters
Which of the following is not a graded potential?
a. end-plate potential b. action potential c. slow-wave potential d. receptor potential e. postsynaptic potential