The curvature of the crista junctions is due to a protein complex called MICOS (mitochondrial contact site and cristae organizing system).

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#Unit 7. System Physiology – Animal

Cardiac cycle  The cardiac events that occur from the beginning of one heartbeat to the beginning of the next.

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#Unit 7. System Physiology – Animal

Each cardiac cycle is initiated by spontaneous generation of an action potential in the sinus node.

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#Unit 7. System Physiology – Animal

Period of relaxation called diastole, during which the heart fills with blood A period of contraction called systole

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#Unit 7. System Physiology – Animal

The total duration of the cardiac cycle, including systole and diastole, is the reciprocal of the heart rate.

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#Unit 7. System Physiology – Animal

Atrial systole 

Preceded by the depolarization of the atria

Contraction of the atrium causes an increase in atrial pressure.

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#Unit 7. System Physiology – Animal

Atrial systole

The P wave is caused by spread of depolarization through the atria and is followed by atrial contraction.