Download
1 / 8
80 likes | 258 Vues
Respiration . Hessa Al Kubaisi 8D. Cellular Respiration. Cellular Respiration is a set of metabolic processes that take place in the cells of organisms to convert energy (glucose) using oxygen and giving out waste products like carbon dioxide and water. Measuring Respiration in yeast.
E N D
Respiration Hessa Al Kubaisi 8D
Cellular Respiration • Cellular Respiration is a set of metabolic processes that take place in the cells of organisms to convert energy (glucose) using oxygen and giving out waste products like carbon dioxide and water.
Measuring Respiration in yeast Material: • Balloons • Narrow funnel • 1 tablespoon (15mL) active dry yeast • 1 teaspoon (5 mL) sugar • measuring spoons • measuring cup • warm water • Ruler
Measuring Respiration in Yeast Procedure: 1. Place the bottom of a funnel into the opening of the balloon. You may need to stretch the opening of the balloon a little bit so that it fits. 2. Pour the yeast and the sugar into the balloon through the funnel. Then fill the measuring cup with warm water from the sink and carefully pour the water into the balloon. 3. Remove the funnel from the opening of the balloon. Tie a knot in the balloon to keep the water-and-yeast mixture inside. Measure your balloon. 4. Place the balloon in a warm place and wait. Measure your balloon again. 5.Now sit back and wait as the balloon gets bigger and bigger.
Measuring Respiration in Plants There are a couple of ways of measuring respiration of a plant. One method which gives the actual amount of carbon dioxide evolved as a by-product of respiration using a gas train. The plant is placed in a chamber that is sealed tightly and dark. A series of flasks are used to first remove the CO2 from the air entering the gas train, bubbled through water to hydrate the air, and through the plant chamber. As the plant respires, it used the O2 gas, emits CO2 gas which continues through the gas train to a bottle containing NaOH (sodium hydroxide). After running the gas train for a specific time period and at a constant temperature, the bottle containing NaOH is removed and the concentration of the remaining NaOH determined by titration. By knowing the amount of CO2 evolved you can calculate the amount of O2 used.
How to measure human respiration 1. Locate an area around the subject where the chest rises and falls. It is important that the subject not know the purpose of being watched. Just knowing that someone is measuring the person's respiration will change the breathing pattern. 2. Begin counting the respirations of the person when the second hand reaches the 12 position on the watch. It is easier to count the rises of the chest than the falls. 3. Count the rises of the chest for 30 seconds. This will give half of the person's respiration rate. 4. Multiply the 30-second count by two. This will give the respiration rate for one minute.
Exchanging Gases • The exchange of carbon dioxide and oxygen occurs in the alveoli. Each alveolus is surrounded by a network of small blood vessels. Like the alveoli, these small blood vessels have extremely thin walls. Blood that enters the vessels has a high level of carbon dioxide, which it picked up from the body tissues. It contains little oxygen. The carbon dioxide leaves the blood and moves through the walls of the blood vessels and alveoli into the lungs. Oxygen from the air in the lungs then passes through the walls of the alveoli and blood vessels and into the blood. The blood, now rich in oxygen, leaves the lungs and travels to the heart. The heart then pumps it to cells throughout the body. The carbon dioxide is finally expelled from the lungs when we exhale.
