Wk 8- Functions Of Cardiovascukar System

Question 1

Cardiac physiology:

1. Receives oxygen - blood and pumps to the ? through the pulmonary a? for pulmonary c?
2. Receives oxygen - blood from the - and pumps blood through body. S? circulation

Answer 1

1. Oxygen Poor , lungs, pulmonary artery , circulation

2. Oxygen rich , lungs, systemic

Question 2

Blood distribution

64%- systemic v- and venules (reservoirs) 
13%- systemic a- and arterioles
9%- p- vessels 
7%- h-
7%- systemic ca?

Answer 2

Veins
Arteries 
Pulmonary 
Heart
Capillaries

Question 3

Cardiac muscle cells:

Connected via intercalated di?
Gap ? transmit a- potentials
D? make tight connections
P? maker cells control c- : the intrinsic conduction system

Answer 3

Discs
Junctions , action
Desmosomes
Pacemaker , contraction

Question 4

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

Answer 4

Right , depolarise
Depolarised , gap
Atrial walls

Question 5

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

Answer 5

1.Atrial
3.Atrial
4.His , Perkinje
5.Perkinje , myocardium
ventricular

Question 6

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

Answer 6

P wave - atrial depolarisation, 1 wave
QRS wave - atrial repolarisation, ventricular depolarisation , 3 waves
T wave- ventricular repolarisation , 1 wave

Question 7

CV vascular system:

Arteries: carry blood - from heart
Capillaries : connect ar? and ve? systems
Veins: r- blood to the ?

Answer 7

Away
Arterial and veinous
Returns , heart

Question 8

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

Answer 8

Gas, nutrients, waste, Interstitial

1. Continuous
2. Fenestrated
3. Sinusoid

Question 9

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

Answer 9

Venules 
Muscular venules 
1 way 
Back flow 
Pooling