Lymph vessels carry lymph to the blood vessels, while lymph nodes are integral parts of the immune system.
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Systemic circulation carries oxygenated blood from the heart to the body, while pulmonary circulation carries oxygenated blood from the lungs to the heart.
Human blood consists of blood cells and plasma.
This animation introduces the most important systems of the human body.
This animation introduces the most important organ systems of the human body.
The heart is the central pump of the cardiovascular system beating several billion times over our lifetime.
Glands of the endocrine system secrete hormones into the blood.
The longest part of the digestive system, where most of the digestion and absorption takes place.
The heart generates the electrical impulses necessary for its own operation. The graphic representation of the electrical activity of the heart is the...