Cardiovascular responses to exercise part 1

Question 1

Cardiac output

Answer 1

amount of blood pumped by heart during a 1 min period (SV x HR)

Question 2

what do CV responses to aerobic exercise depend on?

Answer 2

intensity

duration

Question 3

steady state exercise

Answer 3

when energy expenditure provided for exercise is balanced with energy required

Question 4

Q is the most important factor for increasing ____ consumption during exercise

Answer 4

oxygen

Question 5

what is the anticipatory response to do with Heart rate

Answer 5

where pre exercise HR is greater than resting heart rate because of the release of norepinephrine and decrease in vagal tone

Question 6

what is the steady state HR

Answer 6

optimal HR for meeting circulatory demands at a specific work rate

Question 7

what does steady state HR indicate

Answer 7

heart efficiency and fitness level

Question 8

Frank starling mechanism

Answer 8

increase in LVEDV and increased preload and increased SV

Question 9

increased contractile force = ____ ejection fraction

Answer 9

increased

Question 10

when comparing a trained to an untrained individual at rest, who has the greatest

a) Q
b) HR
c) SV

Answer 10

a) not much difference
b) untrained
c) trained

Question 11

when comparing a trained to an untrained individual at max exercise who has the greater

a) Q
b) HR
c) SV

Answer 11

a) trained
b) similar but slightly lower in athlete
c) trained

Question 12

Blood flow increases to what places during exercise

Answer 12

CNS
heart
muscle
skin (or stays the same)

Question 13

blood flow decreases to what places during exercise

Answer 13

Kidney
Spleen
Liver
GI tract

Question 14

why does pH drop with exercise?

Answer 14

build up of H+ ions and lactic acid

Question 15

why does hematocrit increase during exercise

Answer 15

loss of blood plasma

Question 16

CV responses to Sub-maximal exercise?

Answer 16

Q, HR, SV, RPP all increase until steady state,
DBP has no change, SBP increases, MAP increases slightly
TPR decreases

Question 17

true or : During exercise, SBP rises to a greater extent than Q, and this causes TPR to decrease.

Answer 17

false because Q rises higher than SBP

Question 18

at rest, a-vO2 difference is?

Answer 18

6 ml of O2

Question 19

how much O2 is in 100 ml of blood in the arteries and in the veins at rest

Answer 19

20 ml in the arteries

14 ml in the veins

Question 20

what happens to plasma volume at moderate exercise

Answer 20

decreases

Question 21

what is the reason for decrease in plasma volume during moderate exercise

Answer 21

fluid shifts

Question 22

what is the reason for decreased plasma volume in prolonged exercise

Answer 22

blood volume is reduced by loss of water through sweating

Question 23

what happens in cardiovascular drift

Answer 23

cardiac output remains fairly constant, SV decreases, HR increases