Capillary Body Part Pictures, Images and Stock Photos

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A pulmonary alveolus is one of millions of hollow, distensible cup-shaped cavities in the lungs where pulmonary gas exchange takes place. Oxygen is exchanged for carbon dioxide at the blood–air barrier between the alveolar air and the pulmonary capillary. Alveoli make up the functional tissue of the mammalian lungs known as the lung parenchyma, which takes up 90 percent of the total lung volume.

Vector isolated illustration of human arterial and venous circulatory system in chest anatomy. Blood vessels diagram. Medical infographics for poster, educational, science and medical use.

Blood pressure is the pressure of circulating blood on the walls of blood vessels. When used without further specification, "blood pressure" usually refers to the arterial pressure in the systemic circulation. Vector graphic.

The skin is primarily made up of three layers. The upper layer is the epidermis, the layer below the epidermis is the dermis, and the third and deepest layer is the subcutaneous tissue. The epidermis, the outermost layer of skin, provides a waterproof barrier and contributes to skin tone.

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