The vegetation is present in all parts of the field if it is left uncut for many years.
If a field has been left uncut for a year, the vegetation will grow to its highest point. But if the field is left uncut for five years and then in ten years, all the field is covered with dense vegetation including different types of plants.
The plants will grow and turn into shrub if they are not cut down. After 10 years the field looks like a forest with dense vegetative cover so we can conclude that all the field covered with vegetation if it is left uncut for many years.
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The sequence of impulse through the cardiac conduction system starts from SA node passes to AV node to atrioventricular bundle fibers and finally to Purkinje fibers.
Heart is an organ that receives oxygenated blood form lungs and deoxygenated blood from different parts of body. Oxygenated blood is transported to different organs and deoxygenated blood is transported to lungs for oxygenation.
Now, to perform this transportation, the auricles and ventricles of heart contract and relax. In order to contract and relax, impulse generation is required, which begins at SA node or Sinoatrial node. It is also referred to as pacemaker of the heart. SA node contracts the atria and the impulse transfers to AV node or Atrioventricular node.
This is followed by transfer of impulse to atrioventricular bundle fibers which further passes it on to Purkinje fibres for ventricular contraction. Now the blood is sent to lungs and aorta as per it's oxygen status.
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It breaks down and is denatured as any other protein molecule
