1752991
Description
Flashcards by Gurdev Manchanda, updated more than 1 year ago
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Created by Gurdev Manchanda
almost 11 years ago
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| Question | Answer |
| Transport in animals keywords | 1. the circulatory system 2. heart basics 3. electrical activity of the heart 4. blood vessels 5. haemoglobin |
| Affinity | Tendency to bind |
| Single Circulatory System | Blood only passes through heart once |
| Double Circulatory System | Blood passes through heart twice |
| Open Circulatory System | Blood isn't enclosed in blood vessels all the time, instead it flows freely through the body cavity |
| Closed Circulatory System | Blood is always enclosed inside blood vessels |
| Atrio-Ventricular Valves | Link atria to ventricles |
| Semi-Lunar Valves | Link Ventricles to the pulmonary artery and aorta |
| Valves | Close chamber to stop blood flowing the wrong way. Close due to pressure difference : lower ----> higher closes valve |
| Hydrostatic Pressure | Pressure created by a fluid pushing against the side of a container Arteries |
| Cardiac Cycle | Ongoing sequence of contraction and relaxation of atria and ventricles that keeps blood continuously circulating around the body. |
| Systole | Cardiac Concentration |
| Diastole | Cardiac Relaxation |
| Myogenic | Can contract and relax without receiving signal from nerves |
| ECG | Electrocardiogram. Graph showing the electrical activity of the heart muscle during a cycle |
| SAN | Sino-Atrial Node. Sets the rhythm of the heartbeat by sending regular waves of electrical activity over the atrial walls- both atria contract at the same time |
| AVN | Atrio-Ventricular Node. Passes the waves of electricity from the SAN to the bundle of His |
| Bundle of His | group of muscle fibres which conduct the waves of electrical activity to the purkyne tissue |
| Purkyne Fibres | carry the waves of electrical activity up the muscular walls of the ventricles they contract simultaneously |
| Electrocardiograph | Machine which records the electrical activity of the heart by tracking changes in electrical charge using electrodes placed on the chest - depolarises and repolarises |
| Electrocardiogram (ECG) | Trace produced by electrocardiograph |
| P Wave | caused by contraction (depolarisation) of atria |
| Depolarisation | losing electrical charge - contraction |
| Repolarisation | Regaining charge - relaxation |
| QRS Complex | main peak of heartbeat contraction (depolarisation) of ventricles |
| T wave | relaxation (repolarisation) of ventricles |
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