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Circulatory System

Circulatory System. Functions. The circulatory systems main function is to move materials. Examples: Oxygen-Carbon Dioxide, waste and nutrients. Pericardium. Protective sac of connective tissue that surrounds the heart. Myocardium. The muscle of the heart. * Thick * Strong. Heart Beats.

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Circulatory System

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  1. Circulatory System

  2. Functions • The circulatory systems main function is to move materials. • Examples: • Oxygen-Carbon Dioxide, waste and nutrients.

  3. Pericardium • Protective sac of connective tissue that surrounds the heart.

  4. Myocardium • The muscle of the heart. • * Thick • * Strong

  5. Heart Beats • Average: 72 times a minute.

  6. Atrium and Ventricles Atrium * Top side of the heart (2) Ventricles * Bottom side of the heart (2) • They are separated by a wall called the septum.

  7. Heart

  8. Pulmonary Circulation • * Takes place on the right side of the heart. • * Pumps deoxygenated blood to the lungs to pick up oxygen.

  9. Systemic circulation • Takes place on the left side of the heart. • Oxygenated blood is pumped to the cells thru the aorta.

  10. Heartbeat • When cardiac muscle contracts it does so as one single unit!! • This is a heart beat.

  11. Sinoatrial Node • Located in the right atrium. • Pacemaker of the heart. • Causes the wave of contractions in the atriums.

  12. Left Atrium Sinoatrial (SA) Node Bundle of His Right Atrium Left Bundle Branch Atroventricular (AV) Node Left Ventricle Right Ventricle Right Bundle Branch

  13. Atrioventricular Node • Carries the electrical impulse from the SA node to the ventricles. • This node causes the ventricles to contract.

  14. Left Atrium Sinoatrial (SA) Node Bundle of His Right Atrium Left Bundle Branch Atroventricular (AV) Node Left Ventricle Right Ventricle Right Bundle Branch

  15. Left Atrium Sinoatrial (SA) Node Bundle of His Right Atrium Left Bundle Branch Atroventricular (AV) Node Left Ventricle Right Ventricle Right Bundle Branch

  16. Arteries • Contain oxygen rich blood that is taken to the cells. (Except the pulmonary artery) • Very thick walls to sustain pressure.

  17. Capillaries • Smallest of all the blood vessels. • Walls are one cell thick. • Nutrients and oxygen diffuse into the cells in these vessels.

  18. Vein • Vessels that return blood to the heart. • Contain smooth muscle to move the blood. • Use valves in the vessels to keep the blood going forward.

  19. Components of Blood • 45% Cells • 55% Plasma

  20. Plasma • All other materials in the blood besides blood cells. • 90% water

  21. Plasma Components • Gases • Salts • Waste • Hormones • Nutrients

  22. Red Blood Cells (Erythrocytes) • Most numerous in the body. • Transport oxygen (hemoglobin) • Circulate for about 120 days.

  23. White Blood Cells (Leukocytes) • Help defend the body against foreign invaders. • Will live for many years in the circulatory system.

  24. Atherosclerosis • Fatty deposits called plaque build up on the arteries. • This causes: • 1. Blockage in the artery. • 2. Less flexible vessels.

  25. High Blood Pressure • Makes the heart and blood vessels work harder. • Increases the chance of heart disease, heart attack or stroke.

  26. Heart Attack • Interruption of the oxygen supply to the heart. • Causes death of the heart muscle. • Leading cause of death for both men and women.

  27. Stroke • A clot in or the breaking of an artery in the brain. • Causes the brain cells to be deprived of oxygen.

  28. Platelets • Blood cells that make your blood clot.

  29. Blood clotting • 1. Blood vessel is injured. • 2. Platelets clump at the site and produce a substance that produces strands of fibrin. • 3. Fibrin strands help to clog the opening or hole in the vessel.

  30. Fibrin

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