key terms
aortic valve
located between the left ventricle and the aorta, the largest artery in the body
circulatory system
also known as the cardiovascular system, is often referred to as the "transportation" system of the body
left atrium
Receives oxygenated blood from the lungs
pericardium
A double-layered membrane, or sac, that covers the outside of the heart
septum
A muscular wall that seprerate the heart into a right side and a left side
arrhythmias
Are abnormal heart rhythms and can be mild to life thretening
diastole
The cycle consists of a brief period of rest, followed by a period of ventricular contraction, called systole
left ventricle
Receives blood from the left atrium and pumps the blood into the sorta for transport to the body cells
plasma
Approximately 90% water, with many dissolved or suspended substances.
systole
A period of ventricular contraction
arteries
carry blood away from the heart
endocardium
A smooth layer of cells that lines the inside of the heart and is continuous with the inside of blood vessels
leukocytes
WHite blood cells are not as numerous as are erythrocytes
pulmonary valve
Is located between the right ventricle and the pulmonary artery, a blood vessel that carries blood to the lungs
thrombocytes
also called platelets, are usually described as fragments or pieces of cells because they lack nuclei and vary in shape and size
blood
Flows through the circulatory system is often called a tissue because it contains many kinds of cells
erythrocytes
Red blood cells are produced in the red bone marrow at a rate of about one million per minute.
mitral valve
Located between the left atrium and left ventricle
right atrium
Recieves blood as it returns from the body cells
tricuspid valve
Is located between the right atrium and the right ventricle
capillaries
Connect arterioles with venules, the smallest veins, located in close proximity to almost every cell in the body
hemoglobin
A complex protein composed of the protein molecule called globin and the rion compound called heme.
myocardium
the thickest layer, the muscular layer
right ventricle
Receives blood from the right atrium and pumps the blood into pulmonary artery, which carries the blood to the lungs for oxygen
veins
Are blood vessels that carry blood back to the heart