properties of the circulation in the coronaries, skin, brain, splanchnic circulation and fetal circulation

Question 1

Circulation in the coronaries: Beginning of systole:

Answer 1

the tension of the left chamber of the heart is so high that the blood will be pressed out from the coronary vessels, then reversed blood flow will occur. Reverse flow will not occur in the right chamber, but it will have the same effect except from that.

Question 2

Circulation in the coronaries: Fast ejection phase:

Answer 2

the high pressure in the aorta secures the flow in the coronary arteries.

Question 3

Circulation in the coronaries: slow ejection phase

Answer 3

the pressure in the aorta drops, therefore the coronary perfusion slows
down.

Question 4

Circulation in the coronaries: Diastole

Answer 4

more blood enter the coronary vessels (more than during systole), maximum coronary flow can be measured.

Question 5

Circulation in the coronaries: Diastole

Answer 5

more blood enter the coronary vessels (more than during systole), maximum coronary flow can be measured.

Question 6

Cushing-effect:

Answer 6

when the intracranial pressure increases, then the peripheral blood pressure has to increase as well to keep the constant blood flow to the brain. This is most likely caused by hypoxia in the compressed vasomotor center.