Summary: The Human Body
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Read the summary and the most important questions on The Human Body
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1 The Human Body
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What happens when you breathe in?
The intercostal muscles contract, bringing the ribs up and out. The diaphragm contracts, pulling downwards. The lungs expand causing the air pressure to be lowered and air is drawn in -
What happens when you breathe out?
The intercostal muscles relax, bringing the ribs down and in. The diaphragm relaxes, curving back up. The lungs deflate causing the air pressure to increase and air is forced out -
What types of artificial ventilation are there?
Negative-pressure ventilators - cause air to be sucked in to lungs
Positive-pressure ventilators - force air into the lungs
Hand-controlled ventilators - done by hand -
Describe the journey of blood starting with the vena cava
Vena cava --> Right atrium --> Tricuspid valve --> Right ventricle --> Semi-lunar valve --> Pulmonary artery --> Lungs --> Pulmonary vein --> Left atrium --> Mitral valve --> Left ventricle --> Semi-lunar valve --> Aorta -
What is the function of valves?
To stop backflow -
What are the properties of arteries?
Thick walls containing muscle and elastic tissue -
What are the properties of veins?
Thinner walls, contain valves -
What are the properties of capillaries?
One cell thick walls, narrow -
How do stents work?
Balloon catheter inserted. Balloon inflates the stent. The stent is left in place. The stent opens up the artery -
Why might a valve need to be replaced?
It has a leak, it doesn't open fully
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