Heart 2 Flashcards
Conduction system
Cardiac muscle cells
Automaticity
pacemaker cells that allow to heart to contract simultaneously
Can affect hearts rate and rhythm
Nervous system and hormones
Physiological of the heart
Cardiac conduction
Evg
Electrocardiogram
Electrocardiogram
A record of the spread of electrical activity through the heart
Spread of ecg
Depolarisation and repolarisation of the cardiac muscle
The exact pattern of electrical activity
Is recorded on the body surface depends on where the electrode is placed on the body
Blood vessels
Transport and distribute the blood that is pumped through them by the heart
Arteries
Highly elastic
Veins
Highly distensible
Blood flow depends on
Pressure gradient and vascular resistance
Flow is calculated
Formula ohms las
Ohms law
Flow - perfusion pressure/ resistance of blood vessel
Major arteries to blood
Supplying blood to the heart, arms and head arise from aortic arch
