impulses in the heart

Question 1

what is myogenic

Answer 1

the capacity of the heart to generate its own impulses

Question 2

sinoatrial node

Answer 2

a small mass of cardiac muscles found in the wall of the right atrium that’s generates the heart beat

Question 3

atrioventricular node

Answer 3

this node relays the impulse between the upper and lower sections of the heart

Question 4

systole

Answer 4

when the heart contracts

Question 5

bundle of his

Answer 5

collection of heart muscle cells that transmit electrical impulses from the avn via the branches to the ventricles

Question 6

purkyne firbres

Answer 6

muscle fibres that conduct impulses in the walls of the ventricles

Question 7

orders that these impulses travel

Answer 7

sa node
atrial systole
atroventricular node
bundle of his
bundle branches
purkinjie firbres
ventricular systole

Question 8

how do the impulses make the heart beat

Answer 8

-starts in the heart muscle itself with an electrical signal in the san
-electrical impulses then spreads through the heart as a wave
-from the sa node the impulse travels to the walls of the atria, causing them to contract forcing blood into the ventricles
-impulse passes through the av node found in the septum, which allows atria to fully contract
-impulse passes down through the bundle of his, spilts into 2 branches which split into purkinje fibres
-impulse travels down these fibres causing ventricles to contract and blood to be pumped out the heart

Question 9

atrial depolarisation

Answer 9

the effect the the SA node has on the atria, causing them to contract by providing electrical stimulus across them

Question 10

ventricular depolarisation

Answer 10

the effect that the Anode has on the ventricles, causing them to contract by providing an electrical stimulus

Question 11

atrial and ventricular depolarisation

Answer 11

occurs during a brief time period following depolarisation and describes the electrical impulse returning to a baseline value