P.E Chapter 3 Acute Responses Cardiac System

• Increased heart rate
• Increased stroke volume
• Increased cardiac output
• Increased systolic blood pressure
• Redistribution of blood flow
• Increased aterio-venous difference

• 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

• Linear relationship
• Max HR= 220-age or Max HR = 208- (0.7 x age)

• More blood pumped out the heart per beat to give mre o2 to muslces
• contraction of left ventricle

• 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

• Directly related to a geater stroke volume and high heart rate
• Q= SV x HR

More blood being pumped around more frequently equate to a higher blood pressure in the arteries during contraction

• 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

• Blood needs to be redirected the working muscles so they can receive adequate oxygen levels
• Vasodilation to muscles
• Vasoconstriction to organs

• 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