Wk 8- Functions Of Cardiovascukar System
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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