Arteries: Carry blood away from the heart, Blood is at very high pressure, Thick muscle walls, , Veins: Take blood to the heart, Blood is at low pressure, Thin muscle walls, Contain valves, , Capillaries: Link arteries to veins, Walls are 1 cell thick, Exchange materials between blood and cells, ,

Papan Peringkat

Gaya visual

Pilihan

Berganti templat

Pulihkan simpan otomatis: ?