Which of the following statements concerning immunity is correct?
A. Adaptive immunity responses to pathogens improves over time due to generation of memory, which includes an increase in the number of lymphocytes that respond faster than during the original infection.
B. Adaptive immunity demonstrates specificity, which means that lymphocytes only destroy viruses and ignore all other types of pathogens.
C. Adaptive immunity demonstrates memory, meaning each lymphocyte responds to a particular pathogen, but responds similarly with each infection.
D. All of the choices are correct.
Answer: A
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The salivary center sends impulses via the intrinsic autonomic nerves to the tongue to promote increased salivation
a. True b. False Indicate whether the statement is true or false
Each of the following local factors produces the relaxation of arteriolar smooth muscle except increased
a. acid. b. carbon dioxide. c. osmolarity. d. oxygen. e. potassium.
The series of membranous channels that surround each myofibril is the
A) Sarcolemma. B) Sarcoplasmic reticulum. C) Myolemma. D) Sarcoplasm. E) Transverse tubule.
Muscles exhibit the property of excitability. This means that the muscle
A. shortens its length. B. recoils to its original resting length. C. stretches beyond its normal length. D. responds to stimulation by the nervous system. E. excites itself.