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| Question | Answer |
| Systole | The Contraction Phase of the Cardiac Cycle |
| Diastole | The relaxation Phase |
| Diastole | Ventricles : Relax , Pressure falls Blood in arteries cause semi lunar valves to shut preventing backflow. Blood from veins enter the atria |
| Atrial Systole | Right and left ventricles relaxed, Tricuspid and Bicuspid valves forced open, Atria Contract Blood flows into the ventricles |
| Ventricular Systole | Atria Relax Both Ventricles contract forcing the semi lunar valves open and blood enters the arteries Tricuspid And Bicuspid valves shut due to rise in ventricular pressure. |
| What happens when the compartment has been emptied of blood? | The compartment Relaxes |
| Which ventricle has a thicker muscular wall ? Why? | Left Ventricle, Has to pump blood all round the body whereas the right has to pump blood to the lungs |
| Atrio- Ventricular Valves (2) | Tricuspid , Bicuspid |
| Why are there valves in veins ? | To prevent backflow |
| The heartbeat is initiated in an area of the right atrium called the ___ | SAN |
| The wave of excitation passes across both atria until it reaches an area of tissue in the septum called the ____ | AVN |
| This in turn passes the wave to a group of fibers called the _____which transfers the wave to the apex of the ventricles. | bundle of HIS |
| This causes the ventricles to ____ from the base upwards and forces blood to flow out of the heart through the aorta and ___ | Contract, Pulmonary Artery |
| Name two specialized structural features of Red blood cells, | Biconcave Shape - Increased SA No Nucleus - More room for haemoglobin |
| Blood is made up of ..... | RBC, WBC, Plasma |
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