control of HR

Question 1

what is blood pressure and blood flow controlled by

Answer 1

vasomotor centre located in medualla oblagata

Question 2

what happens to blood flow during exercise

Answer 2

changes in chemical changes detected by chemoreceptors (chnages in co2)
stimuluate vasomotor area which will redistibute blood through vasoconstriction or vasoc=dialtion

more oxygen needed to working msucles so vasocidlation will occur supplying working muscles
vasoconstriction will occur to non-essential organs such as liver, intestines

Question 3

vasodilation

Answer 3

whe blood vessels widen to increase blood flow

Question 4

vasoconstriction

Answer 4

when blood vessels narrow to decrease blood flow

Question 5

what else is stimulated to increase or reduce blood flow

Answer 5

through stimulation of symaptheic nerves
when symaptehic stimualtion increase, vasoconstricion occcurs and blood flow reduces so it can be redistubted to other parts

symaptheic nevers decrease, vasodilation occurs and increse blood flow to that part

Question 6

what else aids blood redistibution

Answer 6

pre-capillery splinters
contact, bllod flow is resticted though capillery
relax, blood flow increased in capillery

Question 7

what is redistibution of vblood imporant for

Answer 7

suppplying oxygen to working muscles
removing waste products e.g c02 and lactic acid