Store calcium for muscle contraction

Contract to pump blood through the chambers

Generate and regulate electrical impulses for heartbeats

Deliver oxygen to cardiac muscle tissue

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Обміну

Інвестуванню та виробництву

Всьому переліченому 

Lack striations

Fatigue quickly during prolonged activity

Do not require oxygen for energy

Can contract without nervous system input

The movement of blood in the veins

The circulation of blood through the lungs only

The electrical activity of the heart only

One complete heartbeat, including contraction and relaxation

The heart relaxes and fills with blood

The atria contract to push blood into the ventricles

The heart stops beating temporarily

The ventricles contract and pump blood out