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CARDIOVASCULAR SYSTEM

CARDIOVASCULAR SYSTEM. VASOMOTOR CONTROL CENTRE. Is responsible for regulating blood pressure VASODILATION dilation of arterioles and opening of precapillary sphincters Increases blood flow to active muscle VASOCONSTRICTION constriction of arterioles and closure of precapillary

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CARDIOVASCULAR SYSTEM

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  1. CARDIOVASCULAR SYSTEM

  2. VASOMOTOR CONTROL CENTRE Is responsible for regulating blood pressure VASODILATION dilation of arterioles and opening of precapillary sphincters Increases blood flow to active muscle VASOCONSTRICTION constriction of arterioles and closure of precapillary sphincters reduces blood flow to inactive organs

  3. Blood flow changes dramatically once exercise commences. • At rest, only 15-20% of cardiac output is directed to skeletal muscle (the majority of it goes to the liver (27%) and the kidneys (22%). • Blood is redirected to areas where it is needed most. • This is known as the VASCULAR SHUNT MECHANISM or Accommodation • Chemoreceptors in muscles inform VCC of increase in Lactic Acid and Carbon dioxide • Baroreceptors in aorta and carotid arteries inform VCC systolic pressure has increased/decreased

  4. The redistribution of blood is controlled primarily by the vasoconstriction and vasodilatationof arterioles. • It reacts to chemical changes of the local tissues. For example, vasodilatation will occur when arterioles sense a decrease in oxygen concentration or an increase in acidity due to higher CO2 and lactic acid concentrations.

  5. ACTIVITY 1 COMPLETE WORKSHEETS 4.11.4 & 4.11.5

  6. THE TRANSPORT OF OXYGEN 97% of Oxygen is carried by red blood cells combined with Haemoglobin in the blood plasma HAEMOGLOBIN + OXYGEN = OXYHAEMOGLOBIN Hb + O2 = HbO2

  7. ACTIVITY 2 DRAW THIS GRAPH AND THEN ADD THE FOLLOWING – BLOOD FLOW CHANGES TO SKELETAL MUSCLE AND ALL OTHER ORGANS 100 80 60 40 20 0 0 100 BLOOD FLOW (% OF CARDIAC OUTPUT) EXERCISE INTENSITY (%)

  8. WHICH LEGAL HABIT IS THE MOST DESTRUCTIVE AND DANGEROUS TO A PERSONS HEALTH ?

  9. SMOKING This simply has a negative effect on aerobic fitness Oxygen wants to attach to the Haemoglobin but the waste product from the smoke (Carbon Monoxide) attaches first therefore the oxygen supply to muscles is greatly reduced

  10. CARBON DIOXIDE Carbon Dioxide produced in the body tissues is transported in blood in different ways • 8% is dissolved in blood plasma • 20% combines with Haemoglobin to form Carbaminohaemoglobin • 70% dissolved in water as Carbonic Acid

  11. ACTIVITY 3 COMPLETE WORKSHEET 4.11.6

  12. ACTIVITY 4 WRITE A LIST OF ALL THE REASONS YOU CAN THINK OF AS TO WHY PRIOR TO PARTICAPTION IN AN ACTIVTY YOU PERFROM A WARM UP *REMEMBER WE ARE IN THE CARDIOVASUCLAR SYSTEM THINK ABOUT THE LAST COUPLE OF WEEKS*

  13. Warm Ups • Improves oxygen supply to muscles via increase in Heart Rate • Increases venous return therefore stroke volume • Initiates Vascular Shunt Mechanism which redistributes blood to the working muscles • Increase in body temp so reduction in blood viscosity • Delays D.O.M.S. – so can work harder for longer

  14. EXERCISE AS PART OF A HEALTHY LIFESTYLE • Cardiovascular disease (CVD) is the main cause of death in the industrialised World and is estimated at 40% of all UK deaths Independent risk factors These are so called because either one will greatly increase the chance of developing CVD Following: Smoking and eating a high fat diet

  15. There are several forms of CVD -Atherosclerosis, the deposition of fatty deposits in the arteries -Coronary Artery Disease, the narrowing of coronary arteries which can lead to angina or myocardial infarction (heart attack) -Stroke, a blockage of the arteries supplying the brain -Hypertension, permanently high blood pressure

  16. Dependent risk factors These are so named because they may not necessarily cause CVD but will increase the chances • Heredity – Genetics through family history • Personality/Stress – How you deal/cope • Lack of exercise – Working at 70%MaxHR can reduce risk by 30% • Age (older) • Gender (men more likely)

  17. ACTIVITY 5 YOU HAVE BEEN ASKED TO DESIGN A TRAINING PROGRAMME FOR MIDDLE AGED MEN WHO HAVE BEEN REALTIVELY INACTIVE FOR YEARS • WHAT FACTORS DO YOU NEED TO TAKE INTO CONSIDERATION • STATE WHICH TYPE OF EXERCISE YOU WOULD RECOMMEND

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