Cardiovascular Phys 2

Question 1

• Arteries: Establish ‘…’ and driving pressure
• Arterioles: …
• Capillaries: Only sites for … with tissues
• Veins/venules: Regulate …

Heart rate control
* Relative contribution of sympathetic and parasympathetic nervous system from rest to exercise

how does vagal tone and sympathetic change?

in what part of blood distribution is determined

Answer 1

• Arteries: Establish ‘bulk flow’ and driving pressure
• Arterioles: Regulate flow to specific regions
• Capillaries: Only sites for gas exchange with tissues
• Veins/venules: Regulate flow return

Heart rate control
* Relative contribution of sympathetic and parasympathetic nervous system from rest to exercise

how does vagal tone and sympathetic change?
VAGAL down and sympathetic up

ARTERIOLES

Question 2

Stroke volume = The volume of …
* Difference in … volume at the end of … and end of …
* SV = … – …
* Units = mL/beat

Ejection fraction = … (…) of blood pumped out of left ventricle relative to …
* EF = … / …
* Units = %

Person 1 (untrained):
* If EDV = 100 mL and ESV = 40 mL, what is SV and EF?

Person 2 (trained):
* If EDV = 160 mL and ESV = 60 mL, what is SV and EF?

Answer 2

Stroke volume = The volume of blood pumped during one beat of the heart
* Difference in ventricular volume at the end of diastole and end of systole
* SV = EDV – ESV
* Units = mL/beat

Ejection fraction = Fraction (percentage) of blood pumped out of left ventricle relative to total volume of left ventricle
* EF = SV / EDV
* Units = %

Person 1 (untrained):
* If EDV = 100 mL and ESV = 40 mL, what is SV and EF?
60ml or 60%

Person 2 (trained):
* If EDV = 160 mL and ESV = 60 mL, what is SV and EF?
100ml or 63%

Question 3

Will SV EDV EF be more difference in trained and untrained

… increases at the start then … at …% of VO2 Max

which of these factors will increase than …
CO, SV, HR, EDV, SV

Cardiac output (Q̇) increases linearly with intensity
WHY?

Answer 3

only EF is not different between trained and untrained people
SV is very different between others

SV increases at the start then plateuas at 50% of VO2 Max

which of these factors will increase than platueau
CO, SV, HR, EDV, SV

Cardiac output (Q̇) increases linearly with intensity
AS SV platueas at a certain part
Increases in HR drive it the most