Presentation on theme: "The Circulatory System"— Presentation transcript:
1The Circulatory System The Heart, Blood Vessels, Blood Types
2The Closed Circulatory System Humans have a closed circulatory system, typical of all vertebrates, in which blood is confined to vessels and is distinct from the interstitial fluid.The heart pumps blood into large vessels that branch into smaller ones leading into the organs.Materials are exchanged by diffusion between the blood and the interstitial fluid bathing the cells.
3The Cardiovascular System Three Major Elements – Heart, Blood Vessels, & Blood1. The Heart - cardiac muscle tissuehighly interconnected cellsfour chambersRight atriumRight ventricleLeft atriumLeft ventricle
5Pathway of the blood From the bodies organs and cells Vena Cava Right Atrium Tricuspid Valve Right Ventricle Pulmonary Semilunar Valve Pulmonary Artery Lungs Pulmonary Vein Left Atrium Bicuspid Valve Left Ventricle Aortic Semilunar Valve Aorta To the bodies organs & cells
6Circuits Pulmonary circuit Systemic circuit The blood pathway between the right side of the heart, to the lungs, and back to the left side of the heart.Systemic circuitThe pathway between the left and right sides of the heart.
7The Cardiovascular System 2. Blood Vessels - a network of tubesArteries Arterioles move away from the heartElastic FibersCircular Smooth MuscleCapillaries – where gas exchange takes place.One cell thickServes the Respiratory SystemVeins Venules moves towards the heartSkeletal Muscles contract to force blood back from legsOne way valuesWhen they break - varicose veins form
9The Cardiovascular System 3. The BloodPlasmaLiquid portion of the blood. Contains clotting factors, hormones, antibodies, dissolved gases, nutrients and waste
10The Cardiovascular System B. Erythrocytes - Red Blood CellsCarry hemoglobin and oxygen. Do not have a nucleus and live only about 120 days.Can not repair themselves.
11The Cardiovascular System C. Leukocytes – White Blood cellsFight infection and are formed in the bone marrowFive types – neutrophils, lymphocytes, eosinophils, basophils, and monocytes.
12The Cardiovascular System D. Thrombocytes – Platelets.These are cell fragment that are formed in the bone marrow from magakaryocytes.Clot Blood by sticking together – via protein fibers called fibrin.
13Disorders of the Circulatory System Anemia - lack of iron in the blood, low RBC countLeukemia - white blood cells proliferate wildly, causing anemiaHemophilia - bleeder’s disease, due to lack of fibrinogen in thrombocytesHeart Murmur - abnormal heart beat, caused by valve problemsHeart attack - blood vessels around the heart become blocked with plaque, also called myocardial infarction