Cardiovascular System

What is the average size of an adult heart?

where does the base of the heart lie?

covering that encloses the heart and the proximal ends of the large blood vessels to which it attaches

outer fibrous bag that surrounds a more delicate, double layered serous membrane

innermost layer of serous membrane that covers the heart

the visceral pericardium turns back upon itself and forms the inner lining of the fibrous pericardium

forms a protective outer covering;secrets serous fluid

contracts to pump blood from the heart chambers

forms a protective inner lining of the chambers and valves

receives blood from the venae cavae and coronary arteries

guards the right atrioventrivular orifice

pumps blood into the pulmonary trunk

guards the base of the pulmonary trunk

receives blood from the pulmonary veins

guards left atrioventricular orifice

pumps blood into the aorta

guards base of the aorta

earlike structures; the parts of the heart that form the walls of the atria

mark the septum that seperates the right and left ventricles

prevents blood from moving from right ventricle into right atrium during ventricular contraction

right atrioventricular orifice

prevents blood from moving from pulmonary trunk into right ventricle during ventricular relaxation

entrance to pulmonary trunk

prevents blood from moving from left ventricle into left atrium during ventricular contraction

left atrioventricular orifice

prevents blood from moving from aorta into left ventricle during ventricular relaxation

entrance to aorta

pathway of blood through the heart

connections between vessels that provide alternate pathways for blood

How is blood supplied to the tissues of the heart?

about _______% of blood from the atria passes into the ventricles before the atrial walls contract

ther period during which a hear chamber is contracting is called

the period during which a heart chamber is relaxing is called

during ventricular contraction, the AV valves are _____

during ventricular relaxation the AV valves are

the pulmonary and aortic valves open when the pressure in the __________ exceeds the pressure in the pulmonary trunk and aorta

heart sounds are due to ________ in heart tissues created by changes in blood flow

the first sound of a cardiac cycle occurs when the ____ are closing

The second sound of the cardiac cycle occurs when the ______ are closing

the sound created when blood leaks back through an incompletely closed valve is called a _____

a mass of merging cells that act as a unit is called