SS2. Cardio vascular system - Blood flow Flashcards
Where does veins lead to?
Towards the heart
Where do arteries lead to?
Away from the heart.
Explain the route deoxygenized blood takes until it is oxygenised again
1) veins lead to superior (top) or inferior (bottom) vena cava into right atrium, right ventricle passing through the tricuspid arterioventricular valve.
2) Blood passes through pulmonary valve, branching off to the lungs via left & right artery where it picks up oxygen and removes CO2.
3) Blood flows into left atrium, to left ventricle, passing through mitral atrioventricular valve, into aortic valve, into aorta.
Pulmonary circulation: Where does pulmonary circulation start?
At the right ventricle.
Pulmonary circulation: Where does blood travel to when it goes to the lungs?
Through the pulmonary trunk to pulmonary artery.
Pulmonary circulation: Where does blood travel through when it is oxygenized in the lungs?
Through pulonary veins (left & right), into left atrium.
Systemic circulation: where does it start?
Starts at left ventricle, goes into body via aorta.
Systemic circulation: where does the oxygenated blood lead to?
To brain, liver, bones, kidneys etc.
Systemic circulation: Where does the deoxygenized blood end up at again?
The superior/inferior vena cava, into the right atrium.
Why won’t RBCs need oxygen?
Because they have no mitochondria.
How does the heart itself get oxygen?
Via systemic circulation, via the coronary vessels. Veins of it downs into the right atrium, and oxygen rich branches off from the aorta.
How do the lungs get blood?
Arteries from the aorta (bronchial vessels) from systemic circulation, and veins goes into the vena cava’s. Mixing blood with pulmonary circulation.
Does blood move at the same time? If so, how?
Yes.
RA to RV: Tricuspid (T) valve RV to pulmonary artery: Pulmonary (P) valve.
LA to LV: Mitral (M) valve
LV to aorta: Aortic (A) valve
What happens when the aortic and pulmonary valves are closed?
The tricuspid and mitral valves are open & vise versa.
What causes the ‘lub’ sound in S1?
Mitral & Tricuspid valve closes (S1)
