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Cardiac Control Centre

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A Recap of the Cardiac Control Centre for AS Level Students

A Recap of the Cardiac Control Centre for AS Level Students

Published in: Health & Medicine

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