2. Classification of vessels:
Conducting - large arteries arising from heart and their branches. Elastic
Distributing - smaller arteries reaching individual organs or regions. Muscular
Resistance - arterioles, main source of peripheral resistance to blood flow. Muscular
Exchange - collective term for capillaires, sinusoids, postcapillary venules. Site of gas/nutrient exchange
Reservoir - large venules and veins. Large volume, low pressure, convey blood back to heart.
Anastomoses - junction of two or more arteries serving same body part
(collateral circulation)
Vasa Vasorum – microcirculatory vessels in walls of large blood vessels (walls > 1mm)
Aorta sizes:
human = 30mm (1 in.)
mouse = 2mm
blue whale = 30cm (15 in)

14. Transparency leg/foot

15. Hepatic-portal circulation