respiration幻灯片.pptVIP

Respiration Anaerobic respiration:?the release of relatively small amount of energy by the breakdown of food substances in the absence of oxygen. Respiration Anaerobic respiration Anaerobic Respiration in Humans: A symbol equation: C6H12O6 → 2C3H6O3 +120KJ A word equation: glucose→ lactic acid + energy Anaerobic Respiration in Yeast: A word equation: glucose→ ethanol?+ carbon dioxide +energy A symbol equation: C6H12O6?→ 2 C2H5OH?+ 2CO2 The oxygen debt The lactic acid that builds up during respiration is poisonous. So it should be broken down，and oxygen is needed to do this. You are taking in the extra oxygen to remove the lactic acid. This is called repaying the oxygen debt. Gaseous exchange? Breathing is different from respiration. Breathing is just the exchange of waste gases from the body with fresh air from the atmosphere.? Respiration is a chemical process releasing energy that happens in every cells. Human Respiratory System: The human respiratory system is made up of air passages (nose, mouth, trachea), lungs and the respiratory muscles (diaphragm muscle, intercostal muscles). Human Respiratory System: Inhalation and exhalation During Inhaling, the diaphragm contracts becoming flatter. The intercostal muscles also contract and move the ribs in an outer upwards directions. These actions expand the thoracic cavity making the lungs expand, thus increasing the volume, with the volume increasing the internal pressure decreases which makes air enter the lungs through the mouth, nose and trachea. During Exhaling, the diaphragm and the intercostal muscles relax again, contracting the thoracic cavity thus squeezing the air out of the lungs to the trachea and mouth and nose to the atmosphere. Respiratory System in Action: Inhaling occurs, air is absorbed by lungs, it enters the nose where bacteria and dust in it are trapped by mucus and warmed by blood capillaries. The air enters the trachea where it is cleaned again by cilia. The bronchi take the air from the tra