1
heart wall consists of three layers
- epicardium: OUTERmost layer
- Myocardium: MIDDLE layer of muslce fibers that contract to pump blood
- Endocaridum: INNER lining that lines the surface of the heart chambers
- Pericardium: Membranous sac surrounding the heart
2
four chambers of the heart
right side
pump is a LOW pressure system
-receives deoxygenated blood
pumps to lungs
3
four chambers of the heart
left side
pump is a HIGH pressure system
-receives oxygenated blood
-pumps to body
4
what does septum mean?
it separates the right and left sides of the heart
5
cardiac valves
direct the flow of blood through the heart chambers
6
the heart
(PMI)
the point of maximal impulse (PMI) can be felt between the fifth and sixth ribs , mid clavicular line
7
coronary arteries
supply the cardiac muscle(myocardium) with blood, oxygen, and nutrients
8
cardiac conduction
-sinoatrial (SA) node
- 60-100 bpm
- initiates electrical impulses
- pacemaker of the heart
9
cardiac conduction
-atriventricular (AV) NODE
- 4-60 bpm
- bundle of his
- right and left bundle braches
- purkinje fibers