Blood Vessels, blood, and blood circulation

Red blood cells, white blood cellls, lymph, tissue fluid. 

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Blood

Several functions:

  • Transport- Red blood cells~oxygen

                         - Plasma-absorbed food, excretory products, hormones

  • Defence-white blood cells
  • Formation of lymph and tissue fluid
  • Homeostatis.

Red Blood Cells

  • Made in the bone marrow
  • biconcave disc-surface area to volume ratio is large-oxygen can diffuse quickly into the cell
  • lack organelles=more room for haemoglobin.

 

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