Heart
- Created by: Megannia2000
- Created on: 13-04-17 08:43
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- The Heart
- Structure of the heart
- If the heart doesn't work properly, tissues and cells won't get enough oxygenated blood so the tissue can't respire, & the supply of blood will be less. This will cause a person to become breathless & fatigued.
- The heart is divided into 2 halves
- Blood flows in one direction through each half of heart
- Valves between the atria and ventricles close to stop back flow of blood when ventricles contract
- Valves at bottom of pulmonary artery and aorta to prevent back flow of blood to ventricles when they relax.
- Tendons attached to valves to stop them from being pushed inside out
- Valves at bottom of pulmonary artery and aorta to prevent back flow of blood to ventricles when they relax.
- Valves between the atria and ventricles close to stop back flow of blood when ventricles contract
- Blood flows in one direction through each half of heart
- Cardiac Muscle
- Coronary arteries on surface which supply heart muscle with oxygen and glucose so it can continue contracting and pumping blood.
- Valves
- One way valves
- Semi-lunar
- Tricuspid
- These are attached to wall of heart to prevent them from being turned inside out
- Semi-lunar
- Biscuspid
- They prevent blood flowing back into ventricles when they stop contracting.
- Stop blood flowing into atrium
- These are attached to wall of heart to prevent them from being turned inside out
- Biscuspid
- One way valves
- Passage of Blood through the heart
- 1) Vena Cava carries blood from organs of body to right atrium
- 2) Blood then passes through a valve to right ventricle
- 3) Right ventricle contracts and so pumps blood through valve into pulmonary artery
- 4) The pulmonary artery passes blood to lungs where it is oxygenated
- 5) Pulmonary vein carries blood from lungs to left atrium
- 6) Oxygenated blood passes through valve into left atrium
- 7) Left ventricle contracts and pumps blood through valve into aorta
- 8) Aorta carries blood from heart to organs of body
- 7) Left ventricle contracts and pumps blood through valve into aorta
- 6) Oxygenated blood passes through valve into left atrium
- 5) Pulmonary vein carries blood from lungs to left atrium
- 4) The pulmonary artery passes blood to lungs where it is oxygenated
- 3) Right ventricle contracts and so pumps blood through valve into pulmonary artery
- 2) Blood then passes through a valve to right ventricle
- How does blood travel from right ventricle to left atrium?
- Muscle of right ventricle contracts and pumps blood through valves of pulmonary artery into the lungs
- Blood then leaves the lungs, passing into the pulmonary vein, re-entering the heart in the left atrium
- Muscle of right ventricle contracts and pumps blood through valves of pulmonary artery into the lungs
- 1) Vena Cava carries blood from organs of body to right atrium
- Cardiac Cycle
- The cardiac cycle is the series of events that occur when the heart beats
- 1) All four chambers are relaxed and partially filled with blood
- 2) ATRIAL SYSTOLE- atrial contract so relaxed ventricles completely fill with blood
- 3) ATRIAL DIASTOLE- continues until next cycle begins
- 4) VENTRI-CULAR SYSTOLE
- 3) ATRIAL DIASTOLE- continues until next cycle begins
- 2) ATRIAL SYSTOLE- atrial contract so relaxed ventricles completely fill with blood
- Effect of exercise on heart beat rate
- Heart rate increases to supply muscles with more oxygen and glucose for respiration
- The lower the heart beat rate the fitter the person
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