Which of the following is NOT applicable to the third line of defense?
A) This system recognizes and acts against particular pathogens or foreign substances.
B) Humoral immunity is provided by antibodies in the body's fluids.
C) The injection of serum containing antibodies will always provide immunity against disease.
D) Immunity in this system is not restricted to the initial infection site.
E) This system recognizes and mounts even stronger attacks on previously encountered pathogens.
C
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Of the following choices, the pH of the least acidic solution is
A) 6.0. B) 4.5. C) 2.3. D) 1.0. E) 12.0.
The articulation that most closely resembles a hinge in the body involves which bones?
A) humerus-ulna B) humerus-radius C) femur-tibia D) femur-fibula
In comparison to arteries, how much do veins change with aging?
a. more than b. about the same c. less than
Which of the following statements regarding skeletal muscle is TRUE?
A. Skeletal muscle fibers have pacemaker activity. B. Skeletal muscle fibers are joined together by gap junctions. C. A given skeletal muscle fiber will contract when excitatory nervous stimuli sufficiently exceed inhibitory nervous stimuli at the motor end plate. D. A given skeletal muscle fiber will contract if excitatory synaptic inputs sufficiently exceed inhibitory synaptic inputs on the motor neuron that innervates that fiber and the motor neuron fires an action potential. E. Skeletal muscle contraction is inhibited by inhibitory motor neurons that synapse onto skeletal muscle fibers.