1.What is meant by respiration?
2.Write three differences between aerobic respiration and anaerobic
respiration?
3.What is the breathing rate? Why does it vary?
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Answers
Answer:
Hi friends
Explanation:
Respiration: The act of inhaling and exhaling air in order to exchange oxygen for carbon dioxide.
Aerobic respiration takes place in presence of oxygen; whereas anaerobic respiration takes place in absence of oxygen. Carbon dioxide and water are the end products of aerobic respiration, while alcohol is the end product of anaerobic respiration. Aerobic respiration releases more energy than anaerobic respiration.
Breathing mostly occurs automatically, which means a person does not have to think about it. Sometimes, the body needs to adjust the breathing rate. Receptors in the brain detect low oxygen or high carbon dioxide and send signals to the body, which can change the breathing rate.
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Answer:
1)
Respiration is a chemical reaction that happens in all living cells, including plant cells and animal cells. It is the way that energy is released from glucose so that all the other chemical processes needed for life can happen. Do not confuse respiration with breathing (which is properly called ventilation).
2)
Aerobic Respiration
Aerobic respiration can only occur in the presence of oxygen. During aerobic respiration, the reactants oxygen and glucose are turned into the products carbon dioxide, water, and ATP.
These products are created during aerobic respiration over the course of three steps: glycolysis, the citric acid cycle, and oxidative phosphorylation. During glycolysis, glucose molecules are broken down into two smaller pyruvate molecules. In the citric acid cycle, electrons are released and gathered by acceptor molecules. During oxidative phosphorylation, the electrons help make a concentration gradient with hydrogen ions that assist a molecule called ATP synthase in building ATP.
Most eukaryotic organisms use aerobic respiration. Eukaryotic organisms are ones whose cells contain a nucleus and other membrane-bound organelles. Virtually all plants and animals use aerobic respiration, and some bacteria do as well.
Anaerobic Respiration
Anaerobic respiration occurs when oxygen is not present. It consists of two steps. The first step, like aerobic respiration, is glycolysis, that produces ATP from the reactant glucose. The second step, fermentation, creates lactic acid or ethanol, depending on the type of fermentation. Lactic acid is produced as a result of lactic acid fermentation, while ethanol is produced as a result of alcohol fermentation. That's why we use yeast in the production of beer to create ethanol, which is what makes people drunk!
3)
Respiratory rate: The number of breaths per minute or, more formally, the number of movements indicative of inspiration and expiration per unit time. In practice, the respiratory rate is usually determined by counting the number of times the chest rises or falls per minute.