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Cardiac Control Centre


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A Recap of the Cardiac Control Centre for AS Level Students

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Cardiac Control Centre

  1. 1. Sixth Form RevisionAS and A-Level P.E.<br />Monday 14th March<br />Miss Bowe<br />
  2. 2. Objectives<br />Starter - Taboo<br />Recap the conduction system of the heart<br />Complete an exam style question<br />Complete some random AS exam questions<br />
  3. 3. Taboo<br />Preparation for the game;<br />Think of or find a topic in your AS textbook<br />Write the topic at the top of the paper<br />Below list 3 words that describe or are associated with the topic you have chosen<br />Hand in your card to me<br />Let’s play …<br />Alveoli<br />Gas exchangeLungsCapillaries<br />
  4. 4. The Conduction System<br />The heart is capable of increasing or decreasing cardiac output to meet the demand for oxygen needed by the working muscles.<br />How is the heart regulatedto meet these changes?<br />
  5. 5. Cardiac control centre (CCC)<br />Located in the medulla oblongataof the brain.<br />The CCC is responsible for regulating the heart.<br />The CCC is controlled by the autonomic nervous system (ANS).<br />AUTONOMICautomatic or involuntary<br />
  6. 6. ANS<br />Is under involuntary control and consists of:<br />Sympathetic nervous system<br />increaseHR (via accelerator nerve)<br />Parasympathetic nervous system<br />decreaseHR (via vagus nerve).<br />
  7. 7. How does the CCC regulate HR?<br />Each cardiac cycle is controlled by the CCC.<br />The CCC initiates either the sympathetic or parasympathetic nervous systemto stimulate the SA node causing either….<br />An increase in HR<br />A decrease in HR<br />
  9. 9. What factors affect the activity of the CCC?<br />Neural control = chemo/baroreceptors<br />Hormonal control = adrenalin<br />Intrinsic control = venous return<br />
  10. 10. During exercise <br /><ul><li>Proprio-receptorsin muscles, tendons and joints, inform CCC that movement has increased.</li></ul>Chemoreceptorslocated in aorta and carotid arteries detect decrease in blood pH due to increase of lactic acid and CO2<br />Baroreceptorsdetect increase in blood pressure, aorta and carotid arteries are sensitive to stretch<br />
  11. 11. Exam question (May 2005)<br />Cardiac Output is a determining factor during endurance activities. Describe how cardiac output is increased during endurance activities. [5 marks/5 points]<br />1. Chemo/Barorecetorsdetect.<br />2. Stimulate CCC<br />3. Initiates Sympathetic via accelerator.<br />4. Increased impulse at SA node.<br />5. Increased HR/SV = increased Cardiac Output<br />