Examlex
The SA node initiates an impulse between 50 to 75 times per minute.
Left Pulmonary Veins
The veins that transport oxygenated blood from the left lung to the left atrium of the heart.
Systole
The phase of the heartbeat when the heart muscle contracts and pumps blood from the chambers into the arteries.
Heart
A muscular organ that pumps blood through the circulatory system by rhythmic contraction and expansion.
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