circulatory responses to exercise

Question 1

5 functions of the cardiovascular system

Answer 1

maintenance, delivery, removal, protection, transport

Question 2

3 components of the cardiovascular system

Answer 2

fluid medium - blood
system of channels - blood vessels
pump - heart

Question 3

what is the composition of blood

Answer 3

55% plasma
45% formed elements

Question 4

arterioles

Answer 4

can determine blood flow to certain organs
intrinsic control at tissue level
vasodilate/vasoconstrict

Question 5

heart contains 2 pumps

Answer 5

‘pulmonary’ (right side) just to lungs low pressure
and ‘systemic’ (left side) all way round body high pressure

Question 6

role of capillaries

Answer 6

exchange of O2, CO2 and nutrients with tissues through diffusion

Question 7

veins and venules

Answer 7

carry blood back toward the heart

Question 8

Cardiac Output (Q) equation

Answer 8

heart rate (HR) x stroke volume (SV)

Question 9

what regulates the heart rate

Answer 9

parasympathetic nervous system
via vagus nerve
slows HR by inhibiting SA and AV node

Question 10

what speeds up heart rate

Answer 10

sympathetic nervous system
by cardiac accelarator nerves
by stimulating SA and AV node

Question 11

mechanism about end diastolic volume

Answer 11

Frank-Starling mechanism
“the force of contraction is proportional to fibre length”

Question 12

Oxygen delivery to exercising skeletal muscle increases due to:

Answer 12

increased cardiac output
redistribution of blood flow from inactive organs to the contracting skeletal muscle