CARDIOVASCULAR SYSTEM

Descrição

Basic overview of the cardiovascular system
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Mapa Mental por offintowonderland, atualizado more than 1 year ago
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Resumo de Recurso

CARDIOVASCULAR SYSTEM
  1. FUNCTIONS OF THE BLOOD
    1. Transport gasses e.g. oxygen & CO2
      1. Distributes nutrients e.g. proteins/lipids/carbohydrates
        1. Transport metabolic waste
          1. Delivers enzymes & hormones e.g Adrenaline
            1. Regulate pH & Electrolytes e.g. salts
              1. Defends body against toxins & pathogens
                1. Regulate body temperature
                  1. Restricts fluid loss through damaged vessels
                  2. COMPOSITION OF BLOOD
                    1. Blood cells = 45%
                      1. Plasma = 55%
                      2. TYPES OF BLOOD CELLS
                        1. Ethrocytes = red cells
                          1. Thrombocytes = platelets
                            1. Leukocytes = white cells
                            2. TYPES OF BLOOD VESSELS
                              1. Arteries
                                1. Arterioles (small artery)
                                  1. Carry blood away from heart
                                    1. Oxygenated blood
                                      1. High pressure
                                        1. Thick muscular elastic walls
                                          1. 3 layers thick
                                          2. Expand & accommodate increase blood volume
                                          3. Veins
                                            1. Venules (small veins)
                                              1. Carry blood to heart
                                                1. Deoxygenated blood
                                                  1. Valves present
                                                    1. Lower pressure
                                                      1. Thin elastic walls
                                                        1. 2 layers thick
                                                      2. Capillaries
                                                        1. Smallest vessel
                                                          1. Extremely narrow
                                                            1. 1 layer thick
                                                              1. Carry blood from artery to vein
                                                                1. Pressure is low
                                                                  1. Flow of blood slow
                                                                    1. Gaseous exchange & nutrients occur
                                                                    2. Heart
                                                                    3. HEART WALL
                                                                      1. Pericardium
                                                                        1. Outer layer
                                                                          1. Blood lymph capillaries & nerve fibres
                                                                          2. Myocardium
                                                                            1. Thin middle layer
                                                                              1. Cardiac muscle tissue
                                                                              2. Endocardium
                                                                                1. Inner layer
                                                                                  1. Forms part of valves in heart
                                                                                2. HEART CHAMBERS
                                                                                  1. Left Atrium
                                                                                    1. Left Ventricle
                                                                                      1. Right Atrium
                                                                                        1. Right Ventricle
                                                                                        2. SYSTOLE
                                                                                          1. 1. Contraction of heart muscle
                                                                                            1. 2. Atria relax & expands
                                                                                              1. 3. Semi lunar valve open
                                                                                                1. 4. Tricuspid & Bicuspid valve closed
                                                                                                  1. 5. ventricles contract
                                                                                                    1. 6. Blood flows to lungs & body
                                                                                                    2. DIASTOLE
                                                                                                      1. Relaxation of heart muscle
                                                                                                        1. 1. Atria contracts
                                                                                                          1. 2. Semi lunar valve closed
                                                                                                            1. 3. Tricuspid & Bicuspid valves open
                                                                                                              1. 4. Ventricles relax & expand
                                                                                                                1. 5. Blood flows from atria to ventricles
                                                                                                                2. HEART BEAT
                                                                                                                  1. Myogenic
                                                                                                                    1. Inilated from within heart muscle
                                                                                                                    2. Automatic nerve system in control
                                                                                                                      1. Cardiac control centre influence cerebrum & hypothalamus
                                                                                                                        1. Be stimulated or inhibited by nerve impulses
                                                                                                                          1. Release of adrenaline from adrenal medulla is control factor
                                                                                                                          2. SA NODE
                                                                                                                            1. Located in wall of right atria near vena cava
                                                                                                                              1. Determines heartbeat
                                                                                                                                1. Initiate heartbeat
                                                                                                                                  1. Usually keeps heartbeat regular
                                                                                                                                    1. Automatic excitation pulse every 0.85 sec
                                                                                                                                      1. Cause artria to contract
                                                                                                                                        1. If SA fails, heart still beats but slower
                                                                                                                                          1. (Sinoatrial)
                                                                                                                                          2. AV NODE
                                                                                                                                            1. Located base of right artria near septum
                                                                                                                                              1. Neuromuscular tissue
                                                                                                                                                1. Signals ventricles to contract
                                                                                                                                                  1. Sends impulses to bundle of His
                                                                                                                                                    1. Then throughout ventricular walls
                                                                                                                                                    2. Wave of excitation conducted along purkinje fibres
                                                                                                                                                      1. (Atrioventricular)
                                                                                                                                                      2. ECG
                                                                                                                                                        1. Measures electrical activity
                                                                                                                                                          1. Consists of waves
                                                                                                                                                            1. P
                                                                                                                                                              1. Movement from SA to AV node
                                                                                                                                                              2. QRS
                                                                                                                                                                1. Movement down centre across ventricle
                                                                                                                                                                2. T
                                                                                                                                                                  1. ventricle repolarisation
                                                                                                                                                                3. Detects abnormal heartbeats
                                                                                                                                                                  1. Arrhythmia = abnormal heart rhythm
                                                                                                                                                                    1. Fibrillation = Heart beating rapidly & contractions uncoordinated

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