The Circulatory System


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Notes on the Cardiovascular system for 7th grade health.

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The Circulatory System

  1. 1. The Circulatory System Study Guide
  2. 2. <ul><li>What is the circulatory (cardiovascular) system? </li></ul><ul><li>It is made up of many arteries, veins, and the heart. </li></ul><ul><li>This system moves blood through your body to provide oxygen to all of your organs and tissues. </li></ul><ul><li>A doctor who studies the heart and cardiovascular system is a CARDIOLOGIST. </li></ul>
  3. 3. <ul><li>Heart </li></ul><ul><li>The heart is a muscle the size of a FIST . It is located slightly to the LEFT of the MIDDLE of your CHEST . </li></ul><ul><li>The heart is like a PUMP . It has two parts, the RIGHT and LEFT . </li></ul><ul><li>The right side receives BLOOD from the body and PUMPS it to the LUNGS to get oxygen. </li></ul><ul><li>The LEFT side receives blood from the LUNGS and pumps it to the BODY . The left side is LARGER because it must push BLOOD a longer distance. </li></ul>
  4. 4. <ul><li>The heart has four areas called CHAMBERS , two on each side. They are the right ATRIUM , left ATRIUM , right VENTRICLE , and left VENTRICLE . </li></ul><ul><li>Atria receive BLOOD returning from the BODY . </li></ul><ul><li>Ventricles PUMP blood out of the HEART . </li></ul>
  5. 5. <ul><li>What does the heart sound like? LUB-DUB </li></ul><ul><li>The “lub” sound occurs while the heart is CONTRACTING to push blood through the body. </li></ul><ul><li>The “dub” sound occurs while the heart is RELAXING and filling with blood. </li></ul><ul><li>What is the instrument that a medical professional uses to listen to your heart? </li></ul><ul><li>STETHOSCOPE . </li></ul>
  6. 6. <ul><li>What is the average or normal resting pulse rate? 60-100 bpm (beats per minute) </li></ul><ul><li>Blood Vessels </li></ul><ul><li>Help carry BLOOD to the ENTIRE BODY </li></ul><ul><li>*arteries carry blood AWAY form the heart. </li></ul><ul><li>* Veins return BLOOD back to the heart. Capillaries are very small tubes that connect ARTERIES and VEINS . </li></ul>
  7. 7. <ul><li>Blood Pressure </li></ul><ul><li>What is blood pressure? </li></ul><ul><li>Measure of the amount of force your blood exert against the walls of your arteries. </li></ul><ul><li>We record blood pressure as two numbers. SYSTOLIC and DIASTOLIC . </li></ul><ul><li>Systolic is the amount of force when the heart is CONTRACTING to push BLOOD through the BODY . </li></ul>
  8. 8. <ul><li>Diastolic is the amount of force when the HEART is RELAXED . </li></ul><ul><li>What is normal (or average) blood pressure? </li></ul><ul><li>120/80 </li></ul><ul><li>Hypertension </li></ul><ul><li>Is also known as HIGH BLOOD PRESSURE . </li></ul>
  9. 9. <ul><li>When blood pressure is too high, you are at risk for STROKE , KIDNEY disease and HEART ATTACK . </li></ul><ul><li>What is a stroke? </li></ul><ul><li>The brain does not get enough blood, oxygen to the brain. </li></ul>
  10. 10. <ul><li>What is a heart attack? </li></ul><ul><li>Part of the heart does not get blood and this can cause your heart muscle to be injured, damaged permanently, and can even cause death. </li></ul><ul><li>Signs and symptoms: </li></ul><ul><li>Chest pain, nauseated, weak body. Pulse may be fast, weak, or irregular. Might sweat, faint, feel dizzy, or unable to catch your breath, skin can become pale or blue. </li></ul>
  11. 11. <ul><li>What happens when your heart stops beating? </li></ul><ul><li>your body will die. </li></ul><ul><li>What is the number one cause of death in the United States? </li></ul><ul><li>Cardiovascular Disease. </li></ul>
  12. 12. <ul><li>Your Blood </li></ul><ul><li>Your heart pumps BLOOD to all the cells in your body. Every minute your heart pumps about 4 1/2 liters of blood, and in one day about 2,000 gallons . </li></ul><ul><li>Blood has two parts: </li></ul><ul><li>PLASMA is the liquid part, made up of WATER , chemicals and nutrients. </li></ul>
  13. 13. <ul><li>The solid part is made up of RED blood cells (RBC’s); they carry OXYGEN to your cells. </li></ul><ul><li>WHITE blood Cells (WBC’s) help to fight INFECTION . </li></ul><ul><li>Platelets help STOP bleeding. Some blood diseases that may affect RBC’s and WBC’s and platelets are ANEMIA and LEUKEMIA . </li></ul><ul><li>Anemia is a DISEASE in which your body does not have enough RBC’s . </li></ul>
  14. 14. <ul><li>This will cause your body to not get enough OXYGEN . Anemia can be cause by BLOOD loss, HEREDITARY , and poor NUTRITION . </li></ul><ul><li>Having too many WBC’s can cause LEUKEMIA . This is CANCER of the blood. </li></ul>