BIOL 1080 Lecture Notes - Lecture 12: Circulatory System, Extracellular Fluid, Arteriole

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Organs/tissues involved include: extracellular fluid, kidneys, liver, lungs, bone marrow. *left and right from perspective of body; looks backwards to us* Deoxygenated blood arrives on right (pulmonary) side of heart. Oxygenated blood leaves through the left (systemic) side. Right side of heart sends blood to the lungs, while left side sends blood to the rest of the body. Most of the blood in circulation is in systemic veins and venules. Thick, strong, elastic to propel the blood forward and handle the high pressures. Very thin walls to allow oxygen and other solutes to move through. Thin walls so they can be easily expanded. As surface area of vessel decreases, velocity increases and vice versa. Maximizes diffusion of particles when needed, and faster transportation when needed as well. Blood is moved upwards against gravity by the pressure gradient between the left and right sides. I. e. expansion of thoracic cavity, contracting skeletal muscles.

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