A-Level (Biology)

Blood Plasma And Tissue fluid.

Plasma : Cells floating in a pale yellow liquid.

Tissue Fluid : the colorless fluid that fills the spaces between body cells.

-Blood : Handles the distribution of nutrients, O2 and Hormones.

-Arteries and Veins : Form the transport route where blood flows à made up of 3 layers ,such as :

1) Inner layer ( Endothelium)

2) Middle layer (Tunica media)

3) Outer layer (Tunica externa)

-Heart : The motor of this transport service.

Capillaries : are sites of exchange.

Blood  :

1)      White  Blood : Made in the bone marrow but are easy to distinguish from red blood cells

2)      Red Blood        : Transport oxygen from lungs to respiring tissues.