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Criado por Gurdev Manchanda
mais de 9 anos atrás
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Questão | Responda |
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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