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lungs & circulatory system aka heart (lungs are in the thorax (3) the…
lungs & circulatory system aka heart
lungs are in the thorax
3) the lungs are like big pink sponges and are protected by the rib cage they surrounded by the pleural membrane
4) the air you breathe goes in through the trachea this splits into 2 tubes called bronchi one going to each lung
2) separated from the lower part of your body with the diaphragm
5 ) the bronchi splits into progressively smaller tubes called bronchioles
1) the thorax is the top part of your body
6)the bronchioles finally end at small bags called alveoli where the gas exchange takes place
alveoli carry out gas exchange in the body
2) blood passing next to the alveoli has just returned to the lungs from the rest of the body containing lots of carbon dioxide and very little oxygen diffuse out the alveolus carbon dioxide diffuses out the blood into the alveolus to be breathed out
3) when the blood reaches body cells oxygen is released from the red blood cells and diffuses into te body cells
1) the lungs contain millions and millions of little air sacs called alveoli surrounded by a network of blood capillaries this is where gas exchange happens
4) at the same time carbon dioxide diffuses out of the body cells into the blood then carried back into the lungs
double circulatory system
1) in the first one the right ventricle pumps deoxynated blood to the lungs to take in oxygen the blood then returns to the heart
2)in the second one the left vertical pumps oxygenated blood around all the other organs of the body the blood gives up its oxygen at the body cells and deoxygenated blood returns to the heart to be pumped out the lungs again.
the circulatory system is made up of the heart blood vessels and blood humans have double circulatory systems two joined together
heart contracts
the heart also needs its own supply of oxygenated blood arteries called coronary arteries branch off the aorta and surrounding the heart making sure that its oxygenated blood it needs.
3) this is how the heart uses its fore chambers
3) the ventricles contract forcing the blood into the pulmonary artery and the aura and out of the heart
2) the atria contracts pushing the blood into the vertices
4) the blood then flows to the organs through the arteries and returns through veins
1) blood flows into the two atria from the vena cava and the pulmonary vein
5) the atria fills again and the whole cycle repeats
2)the heart has valves to make sure that blood flows in the right direction they prevent it flowing backwards
1) the heart is pumping organ that keeps the blood flowing around the body the walls of the heart are mostly made of muscle tissue
heart is a pacemaker
2)these cells produce small electrical signals which spread to the surrounding muscles cells causing them to contract
3) an artificial pacemaker is often used if the cells don't work properly its a little device that's implanted under the skin and has a wire going to the heart it produces electrical current to keep the heart beating regularly
1) your resting heart rate is controlled by a group of cells in the right atrium wall that acts as a pacemaker