The first artery {aorta}| is the largest blood vessel.
Blood leaves heart to go into tubes {artery}|. Arteries have inner endothelium-and-elastic-tissue layer, middle smooth-muscle layer, and outer connective-tissue layer.
Blood flow from aorta can go into heart arteries {coronary artery}|.
Arteries have branches {arteriole}|.
Blood flows from arteries into tubes {capillary}|, where molecules diffuse between blood and tissue fluids. Capillaries have endothelial cell layers. Most peripheral resistance to blood flow is in capillaries.
Head has neck arteries {carotid artery}| on sides.
Head has arteries {vertebral artery} beside spine.
4-Zoology-Organ-Circulation-Parts
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Date Modified: 2022.0225