Biology-Transport in Humans

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Biology

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4 Terms

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Contents of blood

  1. Plasma

  2. Red Blood cells

  3. White Blood cells

  4. platelets

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Plasma contains:

  1. Mainly water

  2. blood cells

  3. excretory substances to be removed

  4. nutrients from digested food and hormones from the endocrine glands

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Function of red blood cells:

  1. transport oxygen from the lungs to the rest of the body

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Adaptations of red blood cells and their functions:

  1. Bioconcave shape: increase the surface area-to-volume ratio which increases the rate of diffusion of oxygen in and out of the cell

  2. no nucleus: more space for haemoglobin for oxygen to bind to

  3. flexible: can easily move through narrow capillaries