Cardiovascular System (LAB 7)

Pulmonary Circuit v Systemic Circuit

Pulmonary: deoxy. Blood from right ventricle → lungs for oxygenation → left atrium

Systemic: oxy. Blood from left ventricle → rest of body →nreturn deoxy. Blood to right atrium

Arteries

-carry blood AWAY from heart, blood moves into arterioles (smaller arteries), then divide into capillaries

-thick walls to withstand high pressure

-round + thin lumen, no valves

-has 3 layers (tunica intima, media, externa)

Veins

-carry blood TO heart, blood from capillary beds drain into venules (smaller veins), then merge to veins

-thin walls, irregular shaped + wide lumen

-valves to prevent backflow

-has 3 layers (tunica intima, media, externa)

Capillaries

-very thin walls, easy for diffusion of gases, nutrients, blood

-1 cell thick, very thin lumen