HSCI 100 Lecture Notes - Lecture 7: Subclavian Vein, Lymphatic Vessel, Venae Cavae

• School: Simon Fraser University
• Department: Health Sciences
• Course: HSCI 100
• Professor: Ian Tietjen

Document Summary

The heart - cardiovascular system: transports nutrients, respiratory gases, wastes, heat, transports immune cells, antibodies, hormones, regulates ph, blood is refreshed in the lungs, kidneys, intestine, liver and spleen. Heart -> aorta -> arteries -> arterioles -> capillaries -> venules -> veins -> venae cavae -> back to heart: oxygenated blood is shown in red (arteries), deoxygenated shown in blue (veins). Arteries & arterioles: carry blood away from the heart, can withstand high pressure (pressure starts high, becomes lower). Walls have 3 layers: thin inner epithelium (endothelium, thick smooth muscle layer that contracts/dilates (vasoconstriction & vasodilation, thick outer connective tissues, arterioles are smaller arteries. Form beds of vessels where fluid exchange with body/tissues cell occurs. Capillaries and lymphatic vessels work together in regulating tissue homeostasis: the lymphatic system is largely a one way street. Lymphatic capillaries fuse into lymphatic ducts, which eventually become lymph nodes.