1. Distinguish between external and internal breathing in detail.
2. Write short notes on the following:
A. Pharynx
B. Larynx
C. Trachea
D. Lungs
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Answers
Answer:
1. External Respiration: External respiration refers to the gas exchange across the respiratory membrane of lungs. Internal Respiration: Oxygen diffuses out from the blood into tissue during internal respiration. External Respiration: Oxygen diffuses from alveolar air into the blood during external respiration.
2. Pharynx - The pharynx is a hollow tube that starts behind the nose, goes down the neck, and ends at the top of the trachea and esophagus. The three parts of the pharynx are the nasopharynx, oropharynx, and hypopharynx.
Larynx - The larynx houses the vocal cords that open to allow breathing; close to protect the windpipe when swallowing; and vibrate to give voice. The noise made by the larynx is changed by the tongue, lips and gums to generate speech.
Trachea - Your trachea, or windpipe, is one part of your airway system. Airways are pipes that carry oxygen-rich air to your lungs. They also carry carbon dioxide, a waste gas, out of your lungs. When you inhale, air travels from your nose, through your larynx, and down your windpipe.
Lungs - The lungs are the center of the respiratory (breathing) system. Every cell of the body needs oxygen to stay alive and healthy. Your body also needs to get rid of carbon dioxide. This gas is a waste product that is made by the cells during their normal, everyday functions.
Answer:
1) Internal respiration occurs when respiration takes place in each cell. Oxygen is used in the mitochondria of the cell to help release energy in food molecules. Because this happens inside the cell it is called internal respiration.
External respiration is the act of breathing . We are moving air that contains oxygen into the lungs where it will be carried by the bloodstream to each cell Then carbon dioxide is released as a waste product from burning the fuel. It travels back to the lungs to be expelled.All animals carry out both types of respiration.