What percentage of the blood is composed of plasma?
A) 75% B) 15% C) 55% D) 45%
Answer: C
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Which of the following statements regarding contraction of a skeletal muscle fiber is TRUE?
A. Some contractions occur without cross-bridge activation. B. Contracting muscle fibers do not always shorten. C. Contraction only occurs following summation of action potentials from many motor neurons. D. Contraction does not always require the occurrence of an action potential. E. Thick filaments shorten when muscle cells contract.
The vitreous humor:
a. is found in the anterior cavity b. is found in the posterior chamber c. is a watery fluid in front of the lens d. both A and C above
If blood flow through the afferent arterioles increases,
A) stretch reflexes trigger vasoconstriction to reduce the flow. B) the smooth muscle in the vessel walls stretches to accommodate the increased flow and the stretch triggers further relaxation of the arteriolar wall, lessening blood pressure. C) the smooth muscle in the vessel walls stretches to accommodate the increased flow. D) the stretch triggers further relaxation of the arteriolar wall, lessening blood pressure.
Which statement is incorrect?
a. Acids can dissociate in solution to yield free hydrogen ions and anions. b. All substances that contain hydrogen are considered to be acids. c. A strong acid has a greater tendency to dissociate than a weak acid. d. The extent of dissociation for a given acid is a constant, K. e. Only free hydrogen ions contribute to the acidity of a solution.