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Heart muscle

contraction of the heart muscle

QuestionAnswer
Myogenic contract without external nervous simulation
What does SAN stand for? Sino atrial node
What does SAN do? co ordinates contraction, wave of depolarisation causes atrial systole
Why cant the wave of depolarisation pass directly to ventricles? insulating fibres
What then happens to the wave of depolarisation? travels through the AVN
What does AVN stand for? atrioventricular node
After passing through the AVN... travel through the purkyne fibres to the apex
What are purkyne fibres? bundles of His
How do the ventricles contract? from the apex upwards
Which part of the brain controls breathing and heart rate. medulla oblongata
Name the two nerves that pass from the medulla oblongata to the SAN sympathetic and parasympthetic
What causes the chemoreceptors to respond increase in CO2 (carbonic acid), drop in O2 levels
Where are the chemorecptors present aorta and carotid arteries
decreased pH results in... impulse sent via sympathetic nerve to SAN to increase heart rate.
how to decrease the heart rate impulse sent through parasympathetic nerve to SAN
What does an electrocardiograph measure? electrical activity of the heart
arrthymia irregular rhythmn
bradycardia heart rate of less than 60 bpm at rest
tachycardia heart rate greater than 100 bpm
ischaemia heart attack
fibrillation un co ordinated heart attack
Created by: 07blandforderin
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