P.E Chapter 3 Acute Responses Cardiac System
Home > Preview
The flashcards below were created by user
on FreezingBlue Flashcards.
What are acute resonses of the cradiovascular system?
- Increased heart rate
- Increased stroke volume
- Increased cardiac output
- Increased systolic blood pressure
- Redistribution of blood flow
- Increased aterio-venous difference
Explain increased heart rate?
- Response to extra energy required by the body during exercise
- Heart pumps more bloood to muscles to deliver more o2 and take away waste products
What type of relation ship does heart ratehave with exercise intensity and what is the formula for Max HR?
- Linear relationship
- Max HR= 220-age or Max HR = 208- (0.7 x age)
Explain the increase in stroke volume
- More blood pumped out the heart per beat to give mre o2 to muslces
- contraction of left ventricle
What are reasons for a higher stroke volume?
- More blood filling heart on venous return means there is more to pump out- great elastic recoil
- Decrease in peripheral resistance
- Increase in neural stimulation
Explain the increase in cardiac output
- Directly related to a geater stroke volume and high heart rate
- Q= SV x HR
Explain the increase in systolic blood pressure
More blood being pumped around more frequently equate to a higher blood pressure in the arteries during contraction
What is the valsalva manoeuvre?
- Trying to breath out with nose and mouth blocked
- Tightens core
- Increases chect cavity pressure
- Creates an increase in both systolic and diasolic blood pressure
Explain the redistribution of blood flow
- Blood needs to be redirected the working muscles so they can receive adequate oxygen levels
- Vasodilation to muscles
- Vasoconstriction to organs
Explain the increase in arteriovenous difference
- Difference in o2 concentration between arteries and veins
- All the o2 is being used at the muscles, hence lower concetration in the veins on return to the heart
What would you like to do?
Home > Flashcards > Print Preview