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Set Cornell Notes on pg. 29.4upCentral and Peripheral Nervous Systems 49 30.3 The Heart and Circulation 2.1 Atoms, Ions, and Molecules Topic: 30.3 The Heart and Circulation •Essential Question(s): 1. On the bottom of pg. 48 please create a doublebubble map comparing and contrasting pulmonary and systemic circulation. Add a picture to each. KEY CONCEPT The heart is a muscular pump that moves the blood through two pathways. 30.3 The Heart and Circulation KEY CONCEPT The heart is a muscular pump that moves the blood through two pathways. 30.1 Respiratory and Circulatory Functions Points to Ponder • Think about the muscles in your body: – Do they get tired? – Hurt? – Sore? – Torn? • Now think about your heart. Does it do these things? 30.1 Respiratory and Circulatory Functions REVIEW • The system includes : – heart pumps blood throughout body Blood Vessels – arteries move blood away from heart - Oxygen-rich blood – veins move blood back to the heart - Oxygen-poor blood – capillaries get blood to and from tissues - *Where gas, water, and nutrient exchange occur 30.1 Respiratory and Circulatory Functions • Blood pressure is a measure of the force of blood pushing against artery walls. • High blood pressure can precede a heart attack or stroke. 30.3 The Heart and Circulation The tissues and structures of the heart make it an efficient pump. • Cardiac muscle tissue works continuously without tiring. NORMAL HUMAN HEART 30.3 The Heart and Circulation • The heart has four chambers: two atria, two ventricles. • Valves in each chamber prevent backflow of blood. • Muscles squeeze the chambers in a powerful pumping action. pulmonary valve aortic valve left atrium right atrium mitral valve left ventricle tricuspid right ventricle septum 30.3 The Heart and Circulation • The heartbeat consists of two contractions. 1) Sinoatrial (SA) node, or pacemaker, stimulates atria to contract LUB 2) Atrioventricular (AV) node stimulates ventricles to contract DUB Lub-dub Lub-dub Lub-dub SA node VA node 30.3 The Heart and Circulation Heartbeat contractions 30.3 The Heart and Circulation • Blood flows through the heart in a specific pathway. 1. oxygen-poor blood enters right atrium from the body 2. Blood pumps into the right ventricle, which pumps blood to lungs to pick up O² 3 3. oxygen-rich blood from 1 lungs enters left atrium 4. Blood pumps into the left ventricle, which pumps blood to the body 4 2 30.3 The Heart and Circulation Oxygen-poor blood Aorta Oxygen-rich Right Atrium blood Left Atrium Left Ventricle Right Ventricle To the body 30.3 The Heart and Circulation 30.3 The Heart and Circulation 30.3 The Heart and Circulation Two main pathways of blood Pulmonary circulation Systemic circulation 30.3 The Heart and Circulation The heart pumps blood through two main pathways. • Pulmonary circulation occurs between the heart and the lungs. – oxygen-poor blood enters lungs - excess carbon dioxide and water expelled (exhale) – blood picks up oxygen (inhale) - oxygen-rich blood returns to heart 30.3 The Heart and Circulation • Systemic circulation occurs between the heart and the rest of the body. – oxygen-rich blood goes to organs, extremities (arms/legs) – oxygen-poor blood returns to heart 30.3 The Heart and Circulation • The two pathways help maintain a stable body temperature. 30.3 The Heart and Circulation Divide the top of pg. 48 Into 4 equal sections Intro to Circulatory System 1m20s Circulatory System 1m56s How the Circulatory System Works Slim Goodbody 3m Blood Circulation 2m48s 5 bullets each video 30.1 Respiratory and Circulatory Functions Lifestyle plays a key role in circulatory diseases. • Some choices lead to an increased risk of circulatory diseases. – smoking – long-term stress – excessive weight – lack of exercise – diet low in fruits and vegetables, high in saturated fats 30.1 Respiratory and Circulatory Functions • Circulatory diseases affect mainly the heart and the arteries. – artery walls become thick and inflexible – plaque blocks blood flow in arteries Plaque Artery wall 30.3 The Heart and Circulation Regular heart vs. Enlarged Heart 30.3 The Heart and Circulation Review: Use your Notes from Friday to help you • Name the four chambers of the heart • Explain the path of the oxygen-poor blood • Explain the path of the oxygen-rich blood • When the oxygen-poor blood enters the lungs what does it drop off and pick up? 30.3 The Heart and Circulation • Name the four chambers of the heart • Right atrium, right ventricle, left atrium, left ventricle • Explain the path of the oxygen-poor blood • Enters the right atrium from the body, to right ventricle, to the lungs • Explain the path of the oxygen-rich blood • Enters from the lungs into the left atrium, to the left ventricle, and out to the body through the aorta • When the oxygen-poor blood enters the lungs what does it drop off and pick up? • Drops off carbon dioxide and water vapor and picks up oxygen 30.3 The Heart and Circulation Crash Course: Respiratory and Circulatory System (12m) http://www.youtube.com/watch?v=9fxm85Fy4sQ 30.3 The Heart and Circulation Aorta Left Atrium Right Atrium Right Ventricle L. Ventricle 30.3 The Heart and Circulation From the body To lungs To lungs From the body 30.3 The Heart and Circulation To the body From lungs From lungs To the body 30.3 The Heart and Circulation From the body To the body To lungs To lungs From lungs From lungs From the body To the body