EKG Flashcards
0
Q
How much is the oxygen consumption of the heart in a resting person?
A
The oxygen consumption is about 8-10ml*min per100g of myocardium.
1
Q
What percentage of the myocardial muscle is composed of mitochondria?
A
40%
2
Q
What can increase 6-7fold with heavy exercise in adults?
A
The myocardial oxygen consumption can increase.
3
Q
What percent does the whole body at rest extract oxygen present in each 100ml of arterial blood?
A
25%
4
Q
How much oxygen does the heart extract from the arterial blood?
A
75%
5
Q
Key point-oxygen use by the heart.
A
The heart is a muscular organ composed of four chambers, ra,rv, la,lv. The coronary arteries supply the myocardium with blood, and the heart meets increasing oxygen demands by increasing blood flow.
