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Cardiovascular Drift

Terms in this set (21)

Starling's Law
During exercise, everything INCREASES

that Q was dependant upon Venous Return

This is the amount of blood that returns to the right atrium from the vena cava

During exercise more blood is returned to the heart...
...therefore SV increases
...therefore Q increases
Ejection Fraction
% of blood pumped out of the ventricles per contraction (beat)
Diastolic filling
The filling of the heart with blood at rest (diastolic phase)
Stroke volume
Volume of blood pumped from the left ventricle in each contraction
What athlete does CV drift effect?
Endurance athletes
After ___ minutes CV drift occurs
10 minutes of prolonged exercise
During Exercise Pulse rate? (I/D)
Increase
During Exercise Stroke volume? (I/D)
Decreases
During Exercise Cardiac output? (I/D)
Increases
During Exercise Venous return? (I/D)
Decreases
Arterial blood pressure (I/D)
Decreases
Define Arterio-venous oxygen difference
The difference in oxygen content of the blood in both the arterial blood and the venous blood.

It is an indication of how much oxygen is removed from the blood in the capillaries as blood circulates the body
Where does arterial blood go?
Arrives at the muscles (leaves left ventricle)
Where does venous blood go?
Leaves the muscles (returns through right atrium)
Arterio-venous difference at rest...
Low. Not as much oxygen is needed by the muscles
Arterio-venous difference during exercise...
High. Working muscles need oxygen
Aerobic training effects on body...
Growth of mitochondria
Increase of red slow twitch muscle fibers
Increase of haemoglobin
Capillarisation
Increased ATP
Define capillarisation
The formation and development of a network of capillaries to a part of the body
What is Venous Return?
The blood that returns to the heart from the veins
Venous return mechanisms
Skeletal muscle pump
Muscles contract squeeze veins (massage action)
Pocket valves in veins prevent backflow
Respiratory pump
Breathing action compresses veins
Suction pump action of the heart
What is the respiratory pump
pressure changes created during breathing suck blood toward the heart by squeezing local veins
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