Anatomy II: cardiac output

What is cardiac output

volume of blood ejected by ventricles per minute

What is diastole

filling

what is systole

pumping

What factor affect cardiac output (volume)

stroke volume and Heart rate

What is stroke volume

volume of blood jected with each heart beat

What is the equation for cardiac output

stroke volume x HR

what is the equation for stroke volume

EDV- ESV

What is end diastolic volume (EDV)

volume of blood in ventricles before contraction

What is end systolic volume (ESV)

volume of blood in venticle at the end of contraction

What are the factor the affect stoke volume

preload, afterload(resistance), and contractility

What is preload

volume of blood in venticle just before contraction (EDV), primary factor affecting stroke volume,

What is afterload(resistance)

pressure in arteries that venricles must overcome to ject blood, pressur ein venticle must be great than in the arteries, harder to jecct blood if pressure in arteries is high

What is contractiity

changing the strength of contraction, changing stroke volume with changing preload or after load,

What causes increased contractility

increase in blood calcium and calcium binging to troponin

What are factors that affect HR

ANS, Emotions, body temp, thyroid hormone

Where is the cardiac system located

in the medulla of the brain

Where is the vasonerve center located

in the medulla of the brain

What does an increase in SNS stimulation cause to HR

increase in HR

What does an increase in PSNS stimulation cause to HR

decrease in HR

What does an increase in body temp cause in HR

increased HR

what does a decrease in body temp cause in HR

decreased HR

What does the thyroid hormone do

regulate metabolic rate

What does an increase in thyroid hormone cause

increase in HR by increasing metabolism