T/F The tunica externa (adventitia) is a well-developed smooth muscle layer of blood vessel walls. False T/F The endothelial (epithelial) cell wall that like the tunica intima of veins is consistent with the tunica intima of arteries. True T/F After leaving the aorta, blood must first pa...
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Aorta, in vertebrates and some invertebrates, the blood vessel (or vessels) carrying blood from the heart to all the organs and other structures of the body. At the opening from the left ventricle into the aorta is a three-part valve that prevents backfl
With each contraction of the heart, arterial blood pressure rises, and the elastic fibers and smooth muscle in the blood vessel walls keep them from expanding too much. Following a contraction of the heart, arterial pressure decreases as the vessels relax. Because of their thick elastic walls, ...
Rarely, bleeding can occur from a diverticulum when a blood vessel inside the diverticulum is weakened by the infection and ruptures. Bleeding from diverticulosis (diverticular bleeding) without the presence of diverticulitis is painless. Bleeding from diverticulosis is generally more severe and brisker ...
They are the cells necessary in blood coagulation for vessel repair and clotting because they form the initial platelet plug. Clotting factors are proteins that aid in the blood coagulation process. Clotting factors are proteins found in the blood plasma that work together to stop bleeding by ...
Custom quiz: Heart Start quiz Left coronary artery The left coronary artery arises from the left semilunar cusp (sinus of Valsalva). The initial portion of the vessel ends at the first bifurcation; it is of variable length and is often referred to as the left main coronary artery. It can...
A great way to consolidate your knowledge of blood vessel histology is quizzing yourself! Get started with ourblood vessel diagrams and artery and vein quizzes. Stimulation of thealpha receptorsproduces contraction of the smooth muscles. On the contrast, stimulation of thebeta receptorsproduces dilat...
Today in Science History - Quickie Quiz Who said: “Dangerous... to take shelter under a tree, during a thunder-gust. It has been fatal to many, both men and beasts.” Thomas Edison Benjamin Franklin Isaac Newton more quiz questions >> ...
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