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chapter 13
The Vascular System
Question | Answer |
---|---|
Arteries carry blood from the ___________ to _____________. | heart, capillaries |
The layer of the wall of an artery that is smooth to prevent abnormal clotting is the __________. | inner layer |
Smooth muscle tissue forms the _________ layer of an artery, and its function is to __________. | middle, maintain blood pressure |
The layer of the wall of an artery that helps prevent rupture is the ___________. | outer layer |
Veins carry blood from __________ to the _______________. | capillaries, heart |
The function of valves in veins is to _____________. | prevent backflow of blood |
The outer layer of the wall of a vein is thin because ___________ in veins is low. | blood pressure |
In the vascular system, an alternate pathway for blood flow is provided by vessels called a(n) ___________. | anastomosis |
Capillaries carry blood from __________ to __________. | arterioles, venules |
In pulmonary circulation, blood is pumped to the lungs by the ____________ and returns to the _______________ of the heart. | right ventricle, left atrium |
The circle of Willis is formed by the two ________ arteries and the ___________ artery. | internal carotid, basilar |
In hepatic portal circulation, blood from the _________ and the __________ flows through the ___________ before returning to the heart. | abdominal digestive organs, spleen, liver |
Systemic blood pressure is highest in the __________. | aorta |
The blood pressure in pulmonary circulation is always ___________ to prevent filtration and accumulation of fluid in the ___________. | low, alveoli |
The venous return mechanism that is especially important for the veins of the legs is the _______. | skeletal muscle pump |
When venous return increases, the heart contracts more forcefully; this is called _________. | Starling's law of the heart |
Angiotensin II causes __________ and stimulates the secretion of __________ both of which will ____________ BP. | vasoconstriction, aldosterone, increase |