Which of the following is involved in the relaxation of a muscle cell?
a. Synthesis of ACh by acetylcholinesterase
b. Initiation of action potentials
c. The troponin-tropomyosin complex slipping back into its blocking position
d. Detachment of actin from tropomyosin
e. T tubules actively absorbing Ca2+
C
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Which of the following is not true of the gastrointestinal tract?
a. It is about 9 feet long in adults. b. It is also called the alimentary canal. c. The material in the gastrointestinal tract is considered to be outside the body. d. All of the above are true of the gastrointestinal tract.
Which age-related change is defined as the formation of a stationary blood clot?
A) aneurysm B) pulmonary embolism C) atherosclerotic plaque D) thrombus E) myocardial infarction
Which of the following is NOT a component of DNA?
Phosphate Deoxyribose sugar Guanine Uracil
The first cell type to exit the blood and move into infected tissues is _______.
a. natural killer cell b. neutrophil c. lymphocyte d. eosinophil e. monocyte