Flashcards
The Cardiac Cycle
Cards in this deck (15)
- 1SystoleThe Contraction Phase of the Cardiac Cycle
- 2DiastoleThe relaxation Phase
- 3DiastoleVentricles : Relax , Pressure falls
Blood in arteries cause semi lunar valves to shut preventing backflow.
Blood from veins enter the atria - 4Atrial SystoleRight and left ventricles relaxed,
Tricuspid and Bicuspid valves forced open,
Atria Contract
Blood flows into the ventricles - 5Ventricular SystoleAtria 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. - 6What happens when the compartment has been emptied of blood?The compartment Relaxes
- 7Which 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
- 8Atrio- Ventricular Valves (2)Tricuspid , Bicuspid
- 9Why are there valves in veins ?To prevent backflow
- 10The heartbeat is initiated in an area of the right atrium called the ___SAN
- 11The wave of excitation passes across both atria until it reaches an area of tissue in the septum called the ____AVN
- 12This 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
- 13This causes the ventricles to ____ from the base upwards and forces blood to flow out of the heart through the aorta and ___Contract, Pulmonary Artery
- 14Name two specialized structural features of Red blood cells,Biconcave Shape - Increased SA
No Nucleus - More room for haemoglobin - 15Blood is made up of .....RBC, WBC, Plasma
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- The Cardiac Cycle Flashcards for As BY2 Exam !
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- WKatie
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