Most of the blood in the right ventricle of the fetal heart ________.
A. passes through the foramen ovale into the left atrium
B. flows into the right ventricle
C. is pumped to the lungs
D. passes directly through the ductus arteriosus into the aorta
Answer: D
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A reticulocyte is a cell formed during erythropoiesis that has lost its nucleus and all organelles except some ribosomes
Indicate whether this statement is true or false.
Mechanisms that do not help regulate blood pressure include ________
A) nervous control that operates via reflex arcs involving baroreceptors, chemoreceptors, and higher brain centers B) chemical controls such as atrial natriuretic peptide C) the dural sinus reflex D) renal regulation via the renin-angiotensin system of vasoconstriction
Active hyperemia
a. refers to the arteriolar dilation that occurs within a tissue in response to local chemical changes that accompany increased metabolic activity of the tissue. b. refers to local arteriolar mechanisms that are aimed at keeping tissue blood flow fairly constant in spite of rather wide deviations in mean arterial driving pressure. c. refers to the increase in blood flow to a tissue that occurs after removal of an occlusion of its blood supply. d. is important in maintaining an adequate pressure head to drive blood forward into a tissue. e. none of these answers.
The thick-walled arteries close to the heart are called muscular arteries.
a. true b. false