Innervations of the heart

Physiology of the heart at the physiology of the heart the following topics:
• Nerve
• Cardiac Cycle
Innervations of the heart
The heart receives about 70 to 80 pulses per minute through the sinus node. These impulses are slowed down by the AV node. The AV node may generate between 40 to 60 pulses per minute. Itself Via the Purkinje fibers, the pulses are spread further into the heart.
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The pulses ensure that the heart muscle contra heart.
The heart beats at rest 60 to 70 times per minute. Per stroke pumps the blood 65 ml to 75 ml of blood around. From these data, the Cardiac output (SMR) can be calculated. HMV = Stroke volume (SV) x Heart rate (HR). At rest in normal people SMR 5 liters.

During exercise, the heart rate can reach up to 200 beats / minute in young untrained adults. The displacement can be up to 100ml. This has the following consequences for HMV. HMV is 200 x 100 = 20000ml = 20 liters per minute.

Heart Cycle
The cardiac cycle consists of several phases:
• Phase is volume ejection
• is volume relaxation phase
• Filling Stage of the ventricles
Is volume phase:
During this phase contraction of the ventricles, but the volume in the ventricle just does not change.