Understand how the structures of blood vessels (capillaries, arteries and veins) relate to their functions

HideShow resource information

Arteries, Veins and Capillaries

  • Blood is transported through tissues via the blood vessels
  • Blood is taken away from the heart via the arteries
  • This reaches the tissues via the capillaries
  • Blood is entered in to the heart via the veins
  • Each blood vessel has a space called a lumen

Artery Structure

(http://revisionworld.com/sites/revisionworld.com/files/imce/artery-as-a2-biology.jpg) 

  • It has collagen fibres which makes them strong and durable which also contain elastic fibres to allow them to stretch and recoil
  • It has smooth muscle (tunica media) which allows them to constrict and dilate
  • It can contract using its thick muscular layer.

Capillary Structure:

(http://revisionworld.com/sites/revisionworld.com/files/imce/capillary-as-a2-biology_0.jpg)

  • It is a thin blood vessel as the endothelium is one cell thick
  • Substances exchange easily
  • It has a high resistance to blood flow as blood is slowed down.
  • This gives time for efficient exchange of chemicals at tissues

Veins Structure:

(http://revisionworld.com/sites/revisionworld.com/files/imce/vein-as-a2-biology_0.jpg)

  • It has collagen fibres which makes them strong and durable which also contain elastic fibres to allow them to stretch and recoil
  • It has smooth muscle (tunica media) which allows them to constrict and dilate
  • It has semi-lunar valves which prevent the backflow of blood

The pressure in the arteries is the highest:

  • The closest to the ventricles
  • They contract forcefully themselves
  • Capillaries are the highest pressure due to the…

Comments

No comments have yet been made

Similar Biology resources:

See all Biology resources »See all Human, animal and plant physiology resources »