what affects heart rate

Question 1

what does the heart respond to and what receptors are invlved?

Answer 1

= chemioreceptors
= pressure receptors
= PH and blood pressure changes
= foundin the walls of the aorta and carotid artery

Question 2

what is the respomd to pressure?

Answer 2

= if pressure is too high may damage the walls of the arteries
= if pressure low, insufficint supply of oxygenated blood to respiring cells an d repva; ofwarse

Question 3

What is the response to PH?

Answer 3

= ph of blood decreases, in high respiration, co2 is produced, lactic acid, excess acid is removed to prevent enzymes denaturing, increased heart rate

Question 4

wht happens if there is an increase in pressure

Answer 4

stimilus: increase pressure
receptors: presusrerecetprs in wall of aorta and carotid artery, are stretched if high blood pressure
= coordination: more electrical impulses sent to the medulla oblongata sent by parasympathetic nueron to SAN to decrease freuqnecy of electrical impulses
= so reduced heart rate

Question 5

What happens if there is a decrease in pressure?

Answer 5

= pressure receptors in walls of aorta and carotoroid artery are not stretched, if low blood pressure
= more electrical impulses are sent to the medulla obloganta, and then impulses sent by synpathetic nueron, to SAN to icrease frequency of electrical impulses
= increased heart rate

Question 6

What happens if there is a decrease in PH ?

Answer 6

= chemoreceptor in wall of aorta and cartoroid artery
= more electrical impukses are sent to the medulla obloganta, and them impulses sent by symphateic nueron, to increase freqyency of electrical impulses
= increased heart rate, to deliver blood to lungs to remove co2

Question 7

What happens if there is an increase in PH ?

Answer 7

= detected by chemoreceptors in the cartoroud artery,