Transportation - AP & TS Class 10th State Board Syllabus Biology

Transportation – AP & TS Class 10th State Board Syllabus Biology



so now let us look at the human circulator system I already told it has got different parts like heart blood and blood results so the first thing we are going to discuss about the heart human heart so human heart is a very very important organ which has to work continuously throughout the life so if it stops beating the life ends there because the supply of energy the nutrients and the oxygen stopped when the heart beats stop so where is this heart located the heart is located in the chest cavity in our body so in the trunk we have two cavities abdominal cavity and torus a cavity or the chest cavity so in the chest cavity here the heart is located between the lungs on either side there are lungs so it is embedded in between these lungs there is phase slightly towards the left side of our line now slightly towards left side the right lung is much bigger compared to the left and because it is giving some place to the heart to accommodate so this is the position of the heart hot is a peer shaped organ the hardship if you observe that it is wide at its the top end and it is narrow or pointed towards the lower end so you see the upper end it is broader lower end is narrow it is in the shape of a peer and the size of a heart the size of the heart of a person will be the size of the fist so this is the size of my fist this will be the size of the heart so approximately this is an approximate calculation showing that to get an idea how much size the heart will be so the heart is located here it is both sides it is cushioned by lungs and at the same time it is protected externally by the ribcage ribcage is the bony case made up of bones called as ribs which is with muscles it is covering the chest cavity so the rib case it is giving protection at the same time the lungs they are giving protection as it is to be very well protected so see how much of protection is given along with these protections we find some other protection around the heart if you see the heart the heart is covered by two membranes called as pericardial pericardial membranes again the heart is covered by two membranes called as pericardial membranes so the two membranes between the two membranes it has got outer pericardial membrane inner pericardial membrane outer and inner so between these outer and inner pericardial membranes it is some fluid in between which is called as pericardial fluid so this pericardial fluid pericardial membrane they give protection from shocks they absorb the shock jerks physical injuries so these are all absorbed by this pericardial fluid and pericardial membranes give protection to the heart now let us look at the internal parts of the heart the other features of the heart the cross section of the heart if you observe the human heart in mammals we find the heart is for Chum bird there are four rooms in the heart in human heart here we can observe the four rooms one two three four so here we observe the four rooms this is not a room this is a blood vessel a broad and thick blood vessel this is not the room of the heart there are the four rules we call them as chambers chambers of our heart so how many chambers are there four chambers are there the upper chambers are called as a tria artery arms these are called as a tree ax and the lower jumpers are called as ventricles there are two atria two ventricles left atria right atria right ventricle left ventricle so these are the four chambers if you observe the adrià are smaller compared to ventricles wind rickles are much bigger compared to atria and moreover the ventricles they have very thick walls thick walls but whereas atria will have very thin walls so now what is the main function of the heart here it performs two major tasks one it is to collect the pure blood from the lattice hewed blood in the sense the blood which contains oxygen and the blood which is free from carbon dioxide so where such blood is found in the lines because in the lungs exchange of gases takes place so after exchange of gases the blood is filled with oxygen and the blood is free of carbon dioxide such blood is called as pure blend or oxygenated blood he used to be brought to the heart so the heart gets the oxygenated blood now what it should do with the oxygenated blood the first a task is completed for the heart that is collecting the oxygenated blood from the lungs what is the second task pumping this oxygenated blood to various parts of our body to head to trunk hands and legs and all the other cells pumping first thing is collecting oxygenated blood from the lungs second thing is pumping the oxygenated blood to all the other parts of the body at the same time the heart pumps again deoxygenated blood to lungs for oxygenation so in this way the heart it pumps the blood two different parts for different purposes and the heart it collects the blood so collecting pumping collecting pumping now let us see the heart is connected to various blood vessels in these blood vessels certain great results some blood vessels are called as arteries some let whistles or cold days winds now if you see that this one this is called as systemic this is the systemic iota systemic artery major systemic artery and if you see this one this is pulmonary artery for pulmonary iota or artery see this is the one which is branched into two and this one is vena cava means major main vena cava so you can see this having connections from down here one connection here one connection this is called superior vena cava superior from the top of our body from the head and all the blood is collected and this is inferior vena cava this is superior vena cava this is inferior vena cava I am talking about the major blood vessels right now so this is the vein this is a vein which is connected to the right atria right atria is connected to a bigger veins to bigger veins one is from the top one is from the bottom the top one is called the superior vena cava and the bottom one is inferior vena cava now this is the system Iike your top you can see very big ring like one that is systemic aorta what is the systemic I Ortegas its supply the oxygenated blood to various parts of our body so that his system in kyoto system acai artery and pulmonary artery this is the pulmonary artery the pulmonary artery it pumps the blood to lungs for oxygenation it pumps the blood to lungs for oxygenation so these are the different arteries and veins we find here we find pulmonary veins pulmonary veins which bring the oxygenated blood from the lungs pulmonary veins bring the oxygenated blood from the lungs to the heart so if you observe the major differences between the arteries and veins arteries are very rigid and there is more pressure in the arteries because arteries they carry the blood with high pressure because the blood is to be supplied to various parts so they are very rigid more is in arteries are more rigid blood vessels which usually carry oxygenated blood the chief function of the arteries is to carry the oxygenated blood the veins are less Raziel which carry the deoxygenated

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