BBC1 年
Structure of blood and blood vessels
except for the pulmonary vein) Allows diffusion of gases and nutrients from blood into the body cells Wall Thick, muscular Thinner Very thin, one cell thick Lumen Small Large Very small ...
BBC4 年
Structure of blood and blood vessels
except for the pulmonary vein) Allows diffusion of gases and nutrients from blood into the body cells Wall Thick, muscular Thinner Very thin, one cell thick Lumen Small Large Very small ...
Green Matters on MSN1 年
Why Are Veins More Blue on Some People Than Others? The Science Behind This Phenomenon
Exercise increases your blood pressure, which can expand the veins, and while lifting heavy weights, muscle contractions can ...