inner layer (lining, or endothelium
The layer of the wall of an artery that is smooth to prevent abnormal clotting is the inner
lining, prevent abnormal clotting
Simple squamous epithelium forms the ? of an artery, and its function is to
In the vascular system, an alternate pathway for blood flow is provided by vessels called an ?
simple squamous epithelial, thinness
Capillaries are made of ? tissue, and its important characteristic is its?
precapillary spincter, smooth muscle
The flow of blood into a capillary network is regulated by a ?, which is made of ? tissue.
In capillaries, oxygen and carbon dioxide are exchanged between blood and tissues by the process of ?
albumin plasma proteins
In capillaries, colloid osmotic pressure is created by the presence of ? in the blood
digestive organs, spleen, liver
In hepatic portal circulation, blood from the ? and the ? flows through the ? before returning to the heart.
In hepatic portal circulation, veins from abdominal organs unite to form the ? vein that empties blood into the ? of the liver.
small intestine, glycogen
One purpose of portal circulation is to enable the liver to receive glucose absorbed by ? and store the excess as ?
One purpose of hepatic portal circulation is to enable the liver to receive alcohol absorbed the stomach and ? it before blood reaches the ?
old RBC, store
One purpose of portal circulation is to enable the liver to receive the iron of ? destroyed in the spleen and ? any excess
Right ventricle, left atrium
In pulmonary circulation, blood is pumped to the lungs by the ? and returns to the ? of the heart.
CO2 (carbon dioxide), O2 (oxygen)
In pulmonary capillaries, ? diffuses from blood to air, and ? diffuses from air to blood.
The BP in pulmonary circulation is always ?. to prevent filtration and accumulation of fluid in the ?
In fetal circulation, blood in the umbilical ? vein has a high level of oxygen, and blood in the umbilical ? has a high level of carbon dioxide.
In fetal circulation, the vessel that takes most incoming blood to the inferior vena cava is the ?
In fetal circulation, the ? permits blood to flow from the right atrium to the left atrium.
In fetal circulation, the ? permits blood to flow from the pulmonary artery to the aorta.
pulmonary artery, aorta
In fetal circulation, the ductus arteriosus permits blood to flow from the ? to the ?
The respiratory pump is especially important for venous return by the veins in the ?
The elasticity of the large arteries permits them to ? during left ventricular systole, and thereby to ? systolic BP.
recoil (snap back), raise
The elasticity of the large arteries permits them to ? during left ventricular diastole, and thereby to ? diastolic BP.
The large arteries are elastic, and are stretched by left ventricular ?, thereby lowering ? BP.
contract more forcefully
Starling's law of the heart states that when cardiac muscle fibers are stretched, they will ?
The hormone that raises blood pressure by increasing heart rate and force of contraction is ?
The hormone that raises blood pressure by causing vasoconstriction throughout the body is ?
The hormone that raises blood pressure by increasing sodium and water reabsorption by the kidneys is
When blood flow through the kidneys decreases, the process of ? decreases, and ? is conserved to maintain BP.
medulla, vasoconstrictor, vasodilator
The ? of the brain regulates the diameter of arteries and veins and has a and a ? area
Blood flow is slowest in ?, and this is important to permit ? for exchanges of materials.
During exercise, blood flow to the heart will ?, and blood flow to the skeletal muscles will ?