cardiac cycle

High pressure

High pressure

________ shuts the atrioventricular valve and opens the semilunar valves, forcing blood into the aorta.

AVN

________ is connected to bundle of His- specially modified muscle fibres, and then impulse is passed to finer branching network of purkyne tissue to the base of the ventricles.

Purkyne tissue carries

________ impulses five times faster than surrounding muscle to ensure that the base of the ventricle contracts first in ventricle systole, forcing blood in the right direction.

atria

Boundary between ________ and ventricles is made of connective tissue which does not conduct these impulses.

Refractory period

________= period of insensitivity to stimulation- longer in the heart than in most muscles, allows heart muscles to relax to allow refilling and prevents the muscle suffering from fatigue.

nervous system

Myogenic= originates within the muscle rather than the ________, and results in depolarisation.

AVN is connected to bundle of His

specially modified muscle fibres, and then impulse is passed to finer branching network of purkyne tissue to the base of the ventricles

refractory period = period of insensitivity to stimulation

longer in the heart than in most muscles, allows heart muscles to relax to allow refilling and prevents the muscle suffering from fatigue