Physiology week3 autonomic system

Question 1

what nerve is used from brain stem to fibres connecting to SA NODE

Answer 1

vagus

Question 2

what does the SA node do

Answer 2

act as a pacemaker

Question 3

can the SA node change due to sympathetic and parasympathetic changes

Answer 3

yes

Question 4

what can effect inital onset of hr increase

Answer 4

arousal / anticipatory rise

Question 5

what is the 2 things that effect regulation of stroke volume

Answer 5

end diastolic volume in the ventricles during pre load and aortic pressure

Question 6

how does arterial pressure effect regulation of stroke volume

Answer 6

increase in cardiac afterload results in a decrease in SV during rest and contractility decreases

Question 7

how is contractility effect regulation of stroke volume

Answer 7

the increase in contractions due to epe, noepe and SNS

Question 8

what is starlings law

Answer 8

increased contractility and venous return results in a bigger SV and Q

Question 9

HOW DOES VENOUS RETURN VARY- 3

Answer 9

vasoconstriction of veins
skeletal muscle pump and constriction
respiratory pump which changes the pressure
and valves

Question 10

does SV and Q differ between public and athlete

Answer 10

yes

Question 11

whats the equation for Q - cardiac output

Answer 11

HR X SV

Question 12

what is systolic pressure

Answer 12

pressure during ventricular contraction

Question 13

what is disatolic pressure

Answer 13

pressure in arteries during cardiac relaxation

Question 14

what is pulse pressure

Answer 14

difference between diastolic and systolic

Question 15

whats equation for MEAN ARTERIAL PRESSURE

Answer 15

DBP+ 0.33 (SBP-DBP)

Question 16

What factors influence Arterial BP

Answer 16

cardiac output
vascular resistance

Question 17

whats long term regulator of arterial bp

Answer 17

kidney - blood volme

Question 18

what is the short term regulation of arterial BP

Answer 18

SNS
Baroreceptors
Increase and Decrease in BP

Question 19

what are the 2 changes and increase when starting exercise

Answer 19

metabolic need for o2 for muscle and cardiac output due to redistribution of blood

Question 20

changes in bp and hr is dependent on what (4)

Answer 20

duration, intensity, environment and emotional influence

Question 21

onset of exercise causes what 4 things

Answer 21

rapid raise in HR,SV OUTPUT
and a plateau in submaximal exercise below lactate

Question 22

during recovery what decreases

Answer 22

HR, SV, Q

Question 23

Incremental exercise - increasing over time
causes what

Answer 23

linear increasing work rate HR, and reaches plateau at 100% VO2 max

Question 24

incremental exercise mean arterial pressure increases along with what

Answer 24

systolic bp not diastolic remains constant

Question 25

Intermittent exercise will result in what HR

Answer 25

near max HR

Question 26

recovery of HR and BP depends on what - 3

Answer 26

fitness level
temp
duration and intensity

Question 27

Prolonged exercise at constant work rate does what to Q and SV

Answer 27

maintained Q and stroke volume decrease due to dehydration

Question 28

prolonged exercise will result in what HR

Answer 28

INCREASED