Cardiac output

 Hello in this video, we’re going to talk about cardiac output so cut output is the output is defined as the amount of body ejected by the heart in one minute so here is a hot in Sicily and the ventricles are contracting injecting blood out to the Toyota and the pulmonary trunk Cut output is defined by the amount of blood ejected by each ventricle in one minute and there are two factors that are used to calculate the output. These are your heart rate and stroke your heart rate is essentially your conduction system of the heart. Your heart rate is how many beats per minutes so beats over minute  

The other factor is your stroke volume 

The factor is your stroke volume which is the volume of blood pumped by each ventricle with each beat so this is ML per beat so 

cardiac output =stroke volume heart rate beat per minute 

therefore cardiac output is equal to multiplied by heart rate and stroke volume ML/ minutes and heart rate is beats per minutes so as 

an example a normal stroke volume would be about 70 mils per beat and heart rate about 75 each per minute cross the beats out and your cardiac output is 5250 mils per minute and this is about 5 L per minute which is about right because the amount of blood passing through the heart minute is about 4 to 6 L and things that can influence your heart rate known as chronotropic factors so you can have positive Cronogropes which increase your heart rate and negative chronotropes which decrease your heart rate, and example of Positive chronotropes is your sympathetic stimulation your adrenaline adrenaline epinephrine epinephrine these guys will increase your heart rate. 

Some drugs can also increase your heart rate such as atropine.