What are the structure and functions of blood vessels?

• Arteries:

  . Thick wall with lots of collagen - strength to withstand hbp 💪

  . Elastic muscle tissue - stretch + recoil to maintain hbp 🎈

  . Folded endothelium lining - stretch to accomodate to hbp

  . Smooth lining of endothelium- reduce friction

  . Smooth muscular tissue - contracts and relaxes, maintaining hbp 💪
• Veins:

  . Large lumen - less resistance 🕳

  . Little collagen + elastic tissue - lbp 🦾

  . Valves
• Capillaries:

  . Has pores 🕳🕳🕳

  . Narrow lumen - maintain hbp

  . No elastic tissue + muscle layers in walls - speeds up diffusion of substances 🚫🎈🧻 + 🚫💪

  . Wall is one cell thick - short diffusion distance🧱