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Each alveolus is surrounded by capillaries carrying deoxygenated blood, which absorbs oxygen out of the air and into the bloodstream.Este artigo precisa de máis fontes ou referencias que aparezan nunha publicación acreditada que poidan verificar o seu contido, como libros ou outras publicacións especializadas no tema. The spine at the back of the skeleton contains the flexible vertebral column which surrounds the spinal cord, which is a collection of nerve fibres connecting the brain to the rest of the body. Claude Bernard (1813–1878) created the concept of the milieu interieur (internal environment), which Walter Cannon (1871–1945) later said was regulated to a steady state in homeostasis. If fertilization fails, the corpus luteum will degrade into the corpus albicans and stop secreting enough progesterone and estrogen, causing the endometrial lining to break resulting in menstruation.

The primary purpose of the atria is to allow uninterrupted venous blood flow to the heart during ventricular systole.Human anatomy, physiology, and biochemistry are basic medical sciences, generally taught to medical students in their first year at medical school. In distinction to the woodcuts of Vesalius, Valverde's plates, were engraved on copper, probably by Gaspar Becerra, who had worked with Michelangelo on the Sistine Chapel. A auga é o principal compoñente do corpo humano, que posúe un 75 % de auga ao nacer e cerca do 70 % na idade adulta. Valverde's famous anatomy boasts beautiful engravings, mainly based on Vesalius, but with many improvements.