HSCI 100 Chapter 12: Chapter 12.docx

• School: Simon Fraser University
• Department: Health Sciences
• Course: HSCI 100
• Professor: Nienkevan Houten

Document Summary

Includes the heart and blood vessels: blood is refreshed in the lung, kidneys , intestine and liver. Lymphatic vessels help this system by collecting excess fluid surrounding tissues and return it to the cardiovascular system: provide means for distributing vital chemicals from one part of the body to another quickly enough to sustain life. Function of cardiovascular system: generate blood pressure, transport blood and other components, exchange of nutrients (glucose) and wastes (co2) at the capillaries, regulate blood flow as needed. Lumen: the hollow interior of a blood vessel, through which blood blows. > epithelium provides a smooth surface that minimize friction so blood can flow smoothly. Arteries: muscle tubes that carry blood away from the heart, the wall has 3 layers, thin inner epithelium (simple squamous , thick smooth muscle layer. > elastic fibres allow an artery to stretch and then return to normal.