Circulatory organ histology

• Blood vessels
  1. Aorta
  2. Small arteriole and venule (EM
  3. Small artery (EM)
  4. Vein and artery
• The heart
  1. Heart
  2. The heart muscle
• Capillaries
  1. Capillaries
  2. Capillaries, continuous (EM)
  3. Capillaries, discontinuous (EM
  4. Capillaries, fenestrated (EM)