Wk 8- Functions Of Cardiovascukar System Flashcards
Cardiac physiology:
- Receives oxygen - blood and pumps to the ? through the pulmonary a? for pulmonary c?
- Receives oxygen - blood from the - and pumps blood through body. S? circulation
- Oxygen Poor , lungs, pulmonary artery , circulation
2. Oxygen rich , lungs, systemic
Blood distribution
64%- systemic v- and venules (reservoirs) 13%- systemic a- and arterioles 9%- p- vessels 7%- h- 7%- systemic ca?
Veins Arteries Pulmonary Heart Capillaries
Cardiac muscle cells:
Connected via intercalated di?
Gap ? transmit a- potentials
D? make tight connections
P? maker cells control c- : the intrinsic conduction system
Discs
Junctions , action
Desmosomes
Pacemaker , contraction
Sequence of Cardiac contraction:
SA node >atrium >AV node >ventricles >AV bundle his >apex Perkinje fibres >^ starts again
SA node of r? atrium cells de?
De? atrial muscle tissue via ?junctions = contraction ar? walls
Right , depolarise
Depolarised , gap
Atrial walls
Cardiac electrical conduction 1. SA node > - activation 2. AV node 3. AV node > - contraction 4. AV bundles (-) > send to p- fibres 5. P- fibres > relay impulse myo? Atrial contraction is complete. V? contraction begins
1.Atrial
3.Atrial
4.His , Perkinje
5.Perkinje , myocardium
ventricular
Electrocardiography (ECG)
Impulses depolarisation and repolarisation
What are the 3 phases of wave patterns? How many waves in each ?
P wave - Atrial ? 1 Wave
QRS wave - atrial ? ventricular ? 3 Wave(s)
T wave- ventricular ? 1 wave
P wave - atrial depolarisation, 1 wave
QRS wave - atrial repolarisation, ventricular depolarisation , 3 waves
T wave- ventricular repolarisation , 1 wave
CV vascular system:
Arteries: carry blood - from heart
Capillaries : connect ar? and ve? systems
Veins: r- blood to the ?
Away
Arterial and veinous
Returns , heart
Capillaries:
Exchange g-, n-, w-, between blood and - fluid.
What are the 3 types of capillaries ?
1. Con? : most common and least porous
2. Fen? : most common in Renal system
3. Sin? : leaky most porous. Found in red bone marrow and liver
Gas, nutrients, waste, Interstitial
- Continuous
- Fenestrated
- Sinusoid
The travel sequence of blood through capillaries
Capillary > post capillary ven? > mus? ven? > veins (valves)
Venous valves = - way
Prevent blood - flow
Prevent blood - in limbs
Venules Muscular venules 1 way Back flow Pooling