Vasculature

Question 1

• What makes up the tunica intima?
• Tunica media?
• Tunica adventitia? Large vessels also have? Why?
• Capillaries: Flow regulated how? Surrounded by? Function? (2)
  1. ) Continuous: Endothelia form? Transfer occurs via?
  2. ) Fenestrated: Endothelia has? Why? Ex?
  3. ) Discontinuous: Endothelia has? What can exit? Ex?

Answer 1

• Inner endothelia, layer of loose or elastic collagenous tissue
• Elastic laminae, smooth muscle or collagen
• Supportive collagenous tissue; vasa vasorum; blood vessels for O2 and nutrients to reach adventitita and outer media
• Allowing 1 RBC at a time; pericytes; give rise to smooth muscle and wound healing
• Uninterupted lining; pinocytosis
• Pores; bulk flow; glomerulus
• Bigger pores; RBC’s; liver and spleen

Question 2

• What are post capillary venules? Also surrounded by? Slower flow allows? Responsive to? (2)
• Meta arterioles/arterio-venous shunts connect what? Allows? (2)
• Anastomoses allow? Helps with?
• End arteries are?
• Portal systems go from what to what? Ex?
• Pampiniform plexus arrangement of veins and arteries allow what in spermatic cord?

Answer 2

• vessels capillaries initially drain into which are structurally similar but greater diameter; pericytes; leukocytes to enter tissue via diapedese; seratonin and histamine
• larger arterioles and venules; direct blood flow or bypass of cap bed
• collateral circulation; occluded vessels
• No alternate arterial supply
• Cap bed to cap bed; pitiuitory portal system
• optimal heat exchange