All of the following is true of the superior sagittal sinus except that it
A) is located in the falx cerebri.
B) collects blood from the brain.
C) converges with the transverse sinus to form the sigmoid sinuses.
D) carries deoxygenated blood.
E) provides blood to the circle of Willis.
Answer: E
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Which of the following statements concerning the peripheral chemoreceptors is incorrect? The peripheral chemoreceptors
a. are stimulated whenever the arterial PO2 falls below normal. b. are weakly stimulated by a rise in arterial PCO2. c. are stimulated by an increase in arterial H+, which plays an important role in acid-base balance. d. are located at the bifurcation of the common carotid arteries and in the aortic arch. e. when stimulated, reflexively increase ventilation.
Which vessel supplies blood to the brain?
What will be an ideal response?
What is a coenzyme?
A. an organic cofactor that directly participates as one of the substrates in an enzymatic reaction B. a metal, such as zinc, that participates in enzymatic reactions C. a term regarding enzymatic reactions that is synonymous with "cofactor" D. any ligand that binds to a specific site on a protein receptor E. an inorganic molecule that catalyzes enzymatic reactions
What are the two possible causes of lower alveolar PO2? Give examples of each.
What will be an ideal response?