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Cardiac Output 1

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Cardiac Output 1

Adult blood volume is about 5 liters

Human blood supply can pass through each heart side in one minute

Stroke volume is the volume of blood during a ventricular contraction

70 milliliters per beat for stroke volume

Cardiac output = stroke volume X heart rate

The more muscle fibers are stretched the results in greater contraction

Slower heart beats allow for time for the ventricles to fill

Calcium enters the the cell for contraction

Faster contractions decrease amount of blood to refill

Heart muscle contractions control stroke volume

Contraction
Stroke volume

Preload
Pressure

Heart Anatomy Review Question, Cardiac Notes, Concept Maps
1.00 studygallery

How many minutes is stroke volume measured?

One

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What controls stroke volume?
Volume of blood ejected from the left ventricle. Contractions or squeezing ejects the blood
Heart muscle contractions

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What happens to the force of contraction when arterial pressure is below normal?
Squeezing harder increases pressure
Increases

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What happens to the heart rate when arterial pressure is below normal?
Pumping faster helps increase pressure
Increases

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What happens to vessels when pressure is above normal?
Expansion decreases internal pressure
Vasodilation

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What measures the stroke volume?
The echo machine can show the velocity of the blood through the aorta
Echocardiogram

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What period of time is stroke volume measured?
One second is to narrow of time. Many things use one minute for a unit of measurement
Minute

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Which contraction does stroke volume measure?

Ventricle

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Which is afterload based on?

Systole

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Which is preload based on?

Diastole

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Which is the lowest pressure in the arteries before ventricular contraction?

Diastolic

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Which ventricle does afterload measure?
Left ventricle pumps oxygenated blood to the rest of the body
Left

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