Circulatory System Overview, Heart Anatomy, and Blood Circulation

Notes

1 BIO102 CIRCULATORY SYSTEM Circulatory System Is composed of both the Cardiovascular & the Lymphatic Systems Carries nutrients and gases to all the cells, tissues, organs, and organ systems, and it carries metabolic waste products away from them. Important as the second line of defense against foreign substances Maintenance of body temperature Components of Circulatory System 1. Heart 2. arteries, capillaries & veins 3. the blood 4. Blood-forming and blood-storing structures, such as the spleen, liver, bone marrow, thymus gland, and lymph tissue. 5. Lymphatic System The Cardiovascular System BLOOD VESSELS Arteries - carry blood away from the heart capillaries - permit exchange of material with the tissues veins - returns blood to the heart 2 arteries arterioles capillaries venules veins Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Fig. 12.16 - Page 223 – 14 th Ed ARTERIES Carry blood away from the heart Inner layer - simple squamous epithelium w/elastic fiber connective tissue middle layer - smooth muscles outer layer - loose connective tissue arterioles- small arteries constrict - when artery muscles contract (dia...