Applied Anatomy and Physiology

Question 1

contract relax

Answer 1

systole = contraction
atrial systole
diastole = relaxation
ventricular diastole

Question 2

heart=?

Answer 2

Heart = myogenic = creates its own impulses

Question 3

sinoatrial node purpose

Answer 3

Sinoatrial node sends electrical impulses to atriums to contract.
Also tells Atrioventricular node to tell Purkinje fibres to stimulate contraction of the ventricles

Question 4

what do Purkinje fibres do

Answer 4

Purkinje fibres stimulate outside walls of ventricles to contract

Question 5

order of events in heart

Answer 5

SA node makes atria contract.
at the same time stimulates AV node.
AV node makes ventricles contract by sending an impulse down the septum and bundle of His to the Purkinje fibres lining the walls of the heart.

Question 6

chemoreceptors

Answer 6

sense CO2 in the blood
increase in CO2 concentration=higher heart rate

Question 7

baroreceptors

Answer 7

sense blood pressure
increase blood pressure=lower heart rate