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human heart has how many chambers

• 4
• 3
• 2
• 1

muscular wall that separates the heart into right and left sides

• valves
• ventricles
• atria
• septum

SA (sinoatrial) node; regulates to pace  the heart

• AV node
• Purkinje fibers
• SV node
• pacemaker

blood vessels that carry blood to the heart; have valves to prevent the backflow of blood

• arteries 
• veins
• capillaries

blood vessels that carry blood to the heart; have valves to prevent the backflow of blood

• arteries 
• veins
• capillaries

smallest blood vessels that allow for o2 and co2 exchange to take place

• arteries
• veins
• capillaries

liquid portion of blood that contains mostly water and many dissolved substances

• plasma
• erythrocytes
• leukocytes
• thrombocytes

Valve between the right atrium and right ventricle

• mitral
• tricuspid
• aortic
• pulmonary

small arteries

• venules
• arterioles
• capillaries
• pulmonaries

The middle layer of the wall of the heart

• epicardium
• myocardium
• endocardium
• septum