Control of Cardiac Function Flashcards
What is the total oxygen consumption of the body?
250ml of oxygen a minute
What is the total oxygen consumption by the brain?
50ml of oxygen a minute
How is a constant flow of oxygen to the brain achieved?
By a constant blood pressure and a constant partial pressure of oxygen
What is the formula for ABP?
ABP = TPR x CO
What controls total peripheral resistance?
Blood vessel diameter
What is the formula for CO?
CO = HR x SV
What is the stroke volume otherwise known as?
The force of contractility
What is the normal stroke volume
70ml of blood per beat
How do you work out stroke volume?
EDV - ESV
What is the normal heart rate?
70bpm
What is the total cardiac output?
70ml x 70bmp = 4900ml = about 5L/min
What is the regular blood pressure?
120/80mmHg
What is intrinsic regulation?
How the heart functions without an stimulus from the outside (neural or hormonal)
In an isolated heart what is the heart rate and where is it generated?
70bpm generated in the sino atrial node
If the sino atrial node is removed where is the heart beat generated and what is the rate?
In the atrio-ventricular node and is 60bpm