A difference in partial pressure between the venous blood and the surrounding structures is known as a partial pressure gradient
a. True
b. False
Indicate whether the statement is true or false
False
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Blood flow through the coronary circulation
a. supplies oxygenated blood to the myocardium b. is the same at rest as during exercise c. supplies only the ventricles with blood d. is similar to blood flow in the pulmonary circulation e. none of the above
What chemical dissolves blood clots?
A) protein C B) plasmin C) thromboxane A2 D) heparin E) fibrin
Select the correct statement about the function of myocardial cells
A) The refractory period in skeletal muscle is much longer than that in cardiac muscle. B) Cardiac muscle cells are innervated by sympathetic, parasympathetic, and somatic nerve fibers so that the nervous system can increase heart rate. C) The entire heart contracts as a unit or it does not contract at all. D) The influx of potassium ions from extracellular sources is the initiating event in cardiac muscle contraction.
In which of the following sequences does PO2 progressively decrease?
A. body tissue, arterial blood, alveolar air B. body tissue, alveolar air, arterial blood C. blood in aorta, atmospheric air, body tissues D. atmospheric air, blood in aorta, body tissues E. body tissue, aorta, alveolar air