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Heart beat
Heart beat
Heart beat
Heart beat
Heart beat
Heart beat
Heart beat
Heart beat
Heart beat
Heart beat
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Heart beat

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  • 1. Heart Beat
  • 2. <ul><li>The sound made by blood hitting the heart valves as it flows through the heart. </li></ul><ul><li>It produces a 'lub-dub' sound. </li></ul>
  • 3. Heart rate <ul><li>Heart rate is the number of heart beats in unit time. </li></ul><ul><li>In a normal healthy male, heart beat around 70 times per minute. </li></ul>
  • 4. Tachycardia & Bradycardia <ul><li>High heart rate is referred to as tachycardia. </li></ul><ul><li>Low heart rate is referred to as bradycardia. </li></ul>
  • 5. Cardiac Cycle <ul><li>The contraction of the heart is called systole. </li></ul><ul><li>During atrial systole, the atria contract pushing blood into the ventricles. </li></ul><ul><li>During ventricular systole, the ventricles contract pushing blood into the lungs and rest of the body. </li></ul><ul><li>Between contractions, the heart relaxes and the atria fill with blood. </li></ul><ul><li>This relaxation stage is called diastole. </li></ul>
  • 6. Cardiac Cycle <ul><li>One cycle of systole and diastole makes up a single heartbeat, which lasts for about 0.8 seconds in humans. </li></ul><ul><li>This is known as cardiac cycle. </li></ul>
  • 7. Electrocardiogram <ul><li>Recording of the electrical activity of the heart is known as an electrocardiogram or ECG. </li></ul>Electrocardiograph
  • 8. Factors Affecting Heart Rate <ul><li>An average adult heart rate is about 70 beats per minute. </li></ul><ul><li>Physical exercise increases the heart rate as tissues need more oxygen. </li></ul><ul><li>Stress or excitement can raise heart rate. </li></ul><ul><li>Rest can lower the heart rate. </li></ul><ul><li>Many drugs such as caffeine and nicotine also have an effect on heart rate. </li></ul>
  • 9. Control of Heart Rate <ul><li>Heart is having intrinsic rhythmicity . </li></ul><ul><li>This means that heart can beat at a constant rhythm, on its own for a long period of time. </li></ul><ul><li>An adult heart removed from the body will continue to contract as long as it is kept in an oxygen rich fluid with suitable nutrients. </li></ul>
  • 10. Control of Heart Rate <ul><li>Heart can produce its own impulses necessary for the functioning of cardiac muscles. </li></ul><ul><li>These impulses are called cardiac impulses and produced at special tissues found on the walls of right atrium. </li></ul><ul><li>The cardiovascular centre in the brain can increase or decrease the speed of the heart rate depending on the requirements of the body. </li></ul><ul><li>Some hormones such as adrenaline can also affect heart rate. </li></ul>

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