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chapter 13

The Vascular System

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
Created by: cramacher