Please enable JavaScript.

Coggle requires JavaScript to display documents.

transport in animals (blood vessels (differences between blood, tissue…

- - - - thick and muscular walls
      - have elastic tissue to stretch and recoil as heart beats to maintain high pressure
      - inner lining (endothelium) is folded allowing artery to expand and maintain high pressure
    - - have a layer of smooth muscle but less elastic tissue than arteries
      - smooth muscle allows them to expand and contract to control amount of blood flowing to tissues
    - - walls are only one cells thick (adapted for diffusion of oxygen / glucose
    - - have very thin walls
    - - large lumen and less elastic/ muscle tissue
      - have valves to stop blood flowing backwards
      - blood flow through veins is helped by contraction of body muscles surrounding them
- - - - heart pumps blood to gills (to pick up oxygen) and then on through the rest of the body
    - - right side of heart pumps blood to lungs, left side pumps blood to the rest of the body
  - - - heart pumps blood into arteries which branch into capillaries
      - substances like oxygen and glucose diffuse from the blood in the capillaries into the body cells, but the blood stays inside the vessels as it circulates
      - veins take blood back to the heart
    - - the heart is segmented, it contracts in a wave, starting from the back and pumping blood into a single main artery
      - the artery opens up into the body cavity
      - the blood flows around the insects organs gradually making its way back to the heart segments via a series of valves
      - doesn't supply cells with oxygen only hormones and nutrients (glucose)