Chap 31- Function of Cardiac System Flashcards
Primary Function of Cardiovascular System
- Transport O2 to tissues and organs
- Transpot Nutrients to tissues & organs
-Deliver waste products to organs for excretion
All organs need constant supply of ____ & ______
Blood and oxygen
The heart is a double pump. T or F
True
Pulmonary & System Circulation
Right side of heart is what ….
Pulmonary Circulation (pumps to lungs)
Left side of hear is what type of circulation
Systemic Circulation (pumps to left side of body)
Why is L side of heart more muscular?
It has to pump blood to all tissues and organs of the body
3 Layers of Heart (In to Out)
Endocardium
Myocardium (muscular layer)
Epicardium
Which system controls the heart?
ANS- Heart has its own automaticity
pacemaker of heart that shoots impulse that start contraction of the heart
SA node (in R Atria)
Purpose of valves in the heart
-Opens and closes in response to blood pressure changes
-Pushes blood in one direction to increase efficiency
-Helps prevent back flow of
back flow of blood in heart is called
regurgitation (makes heart work harder)
4 valves in heart
Tricuspid
Mitral
Pulmonic semi lunar
Aortic Semi Lunar
Reasons for Faulty Heart Valves
Inflammation
Infection
Trauma
Congenital Defect
flow of blood through body’s tissues
perfusion
a blood vessel that carries blood FROM the heart to tissues and organs in the body
arteries
A blood vessel that carries blood TO the heart from tissues and organs in the bod
veins
a very small blood vessel that branches off from your artery and carries blood away from your heart to your tissues and organs.
arterioles
smallest blood vessel in body that T transport blood, nutrients and oxygen to cells in your organs and body systems; gas exchange takes place here
capillaries
Difference between alveoli and capillaries
Alveoli are tiny air sacs in lungs where gas exchange occurs, capillaries surround alveoli and facilitate the exchange
Gas exchange in lungs takes place…
Gas exchange in vascular system take place
lungs-alveoli theyre just in lungs
vascular- capillaries *theyre all throughout body
Normal Cardiac System Depends on
- Ability to generate & conduct electrical impulses (SA node works)
- Ability to fill and empty properly (Valves work)
- Contractility of the heart (heart is a muscle, should be strong)
Major cause of low/lack blood flow
Faulty valves (blood is not getting where it should
inherent firing rate of 60-100 bpm
Sinoatrial Node
able to inherently fires at 40-60 BPM
AV node (Atrioventricular)
able to inherently fire at a rate of 30-40 BPM
L&R Bundle of His
able to inherently fire at a rate of 20-30 BPM
Purkinje Fibers *Pt will need a pacemaker *
