Exam5 Ch 17 Cardiovascular Fxn

• moves blood through lungs • smaller than systemic circulation • lower pressure • R side of heart, pulmonary arteries, pulmonary capillaries, pulmonary veins

• moves blood throughout all other tissues of body • higher pressure • L side of heart, aorta & its branches, capillaries that supply brain & peripheral tissues, systemic venous system & vena cava

Principles that govern blood flow in the circulatory system

Elastic walls, fxn as distribution system, highest pressure but much less volume of blood

• small size, large surface area, thin walled, link arterial & venous sides of the circulation • exchange system where transfer of gas, nutrients and wastes take place • has smallest amount of blood

• thin-walled, distensible, reservoir to cllect blood from capillaries and return it to the right heart • low pressure but largest amount of blood • valves that require body movement in order to move blood back up thru body

Thin outer layer that lines the pericardial cavity

Middle muscular layer consisting of the heart muscle

Inner thin, smooth, interior lining of the chambers and valves of the heart

Sac that encloses the heart

Inner layer of the sac

Layer laying on top of the epicardium

Outermost layer of the sac which is highly resistant to distention

Separtes right atrium from right ventricle

Separates left atrium from left ventricle

Semilunar valve separates right ventricle from pulmonary trunk

Semilunar valve that separates the left ventricle from the aortic arch

When ventricles are contracting. Top number on BP reading

When ventricles are relaxed and filling. Bottom number on BP reading - most important number

The work or load imposed on the heart before the contraction begins

Work presented to the heart after the contraction has started

• Pacemaker of the heart • where rhythmic impulse is generated • fastest rate of firing

Conduct impulse from SA node to AV node

• located in the inferior portion of the interatrial septum - conduction very slow here