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The Circulatory System

The Circulatory System. The body’s transportation system. Cardiovascular System. Lymphatic System. Provides an alternate route for extra plasma so it can get reabsorbed into the blood stream. Contains the heart which pumps blood through a network of blood vessels.

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The Circulatory System

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  1. The Circulatory System The body’s transportation system.

  2. Cardiovascular System Lymphatic System Provides an alternate route for extra plasma so it can get reabsorbed into the blood stream. • Contains the heart which pumps blood through a network of blood vessels. We are going to focus on the cardiovascular system.

  3. Beats more than 2.5 billion times in an average life span. Slightly larger than a fist. Lies within the thoracic cavity, behind the sternum, and between the two lungs. Pericardium: tough membrane that surrounds the heart and secretes fluid to reduce friction. The Heart

  4. Right side of the heart: pumps blood into lungs Left side of the heart: pumps blood intothe rest of the body Left atrium Atrium: upper chambers of the heart Ventricle: lower chambers of the heart Right atrium Right ventricle Left ventricle Septum Chambers of the Heart

  5. Right Left Valves: flaps of tissue that open in only one direction Semilunar Valve (SV valve) Includes pulmonary and aortic valves Aortic Valve Atrioventricular Valve (AV valve) Includes tricuspid and bicuspid valves Bicuspid valve Pulmonary Valve Tricuspid Valve Heart Valves

  6. HEAD Right Left Superior Vena Cava Aorta LUNGS Pulmonary Artery Inferior Vena Cava BODY Entries and Exits of the Heart

  7. Deoxygenated (oxygen poor) blood from the superior and inferior vena cava enter the right atrium. • That blood gets sent to the right ventricle. • Muscle contraction takes place in the right ventricle which pushes the blood through the pulmonary arteries into the lungs. Circulation in the Heart Pt. 1

  8. Oxygenated (oxygen rich) blood travels back from the lungs into the left atrium. • That blood then goes into the left ventricle. • Muscle contraction takes place in the left ventricle forcing the blood through the aorta. • The aorta transports the blood to the head and the rest of the body. Circulation in the Heart Pt. 2

  9. Muscle cells in the heart contract in waves. • When one set of cells is stimulated by an electrical impulse, the neighboring set is then stimulated and so on and so forth. • Domino effect. Control of the Heartbeat

  10. Sinoatrial node: spontaneously initiates electrical impulse to the atria. “Pacemaker” Atrioventricular node: relays the electrical impulse to the ventricles Systole: contraction Diastole: relaxation Asystole: no contraction Cardiac arrest Nodes of the Heart

  11. Pulse: series of pressure waves within an artery caused by contractions of the left ventricle. • Blood surging through your arteries and veins once the ventricle contracts causes the elastic walls of the vessels to expand. • Average pulse for adults is 70 to 90 bpm. Take your pulse!

  12. Arteries: muscular vessels that carry oxygenated blood away from the heart. • Veins: large blood vessels that carry deoxygenated blood back to the heart. • Merge to form the superior and inferior vena cava. • Capillaries: network of tiny vessels. • Very close to the size of a cell so exchange of materials is rapid. Blood Vessels

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