Principle Veins - Medical Look Human Anatomy

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Principle Veins

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Oxygenated blood reaches the tissue, where gasses and wastes are exchanged, and then the oxygen depleted blood is returned to the right atrium of the heart via the network of veins. When the oxygen depleted blood leaves the body’s tissue, the network of veins it traverses increases incrementally in diameter until it reaches the heart. Veins at the tissue are microscopic while the largest veins can be found entering the right atrium. The venous system is somewhat backwards from the arterial system. Arteries branch off into smaller arteries while veins receive smaller tributaries into the larger veins. With the exception of the lungs, the veins that come from the rest of the body all finally merge into one of two large veins before emptying back into the heart. The superior and inferior vena cavas are responsible for the final entrance to the right atrium. There are more veins than there are arteries in the human body. Veins either run close to the skin and are known as superficial veins based on their location. These are vital in the medical field for injection and drawing blood from the human body. Deep veins are often found well inside the body running alongside the arteries that feed the body part that the veins empty. Veins are named based on the region they empty as well as the organs they serve.

Autonomic nervous system Central nervous system Circulatory system
Digestive system Endocrine system Female reproductive system
Lymphatic system Male Reproductive System Muscular system
Peripheral nervous system Respiratory System Sensory organs
Skeletal System Urinary system

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