D. Answer the following questions.
1. What is an organ system?
2. What do you mean by digestion?
3. What is circulatory system?
4. Name the four types of teeth we have.
5. What is the function of lungs in respiratory system?
Answers
1. An organ system is a group of organs that work together as a system to perform one or more functions.
2. The digestive system consists of the parts of the body that work together to turn food and liquids into the building blocks and fuel that the body requires.
3. The circulatory system is made up of blood vessels that carry blood away from and towards the heart. Arteries carry blood away from the heart and veins carry blood back to the heart. The circulatory system carries oxygen, nutrients, and hormones to cells, and removes waste products, like carbon dioxide.
4. Four types of teeth :
- Incisors
- Canines
- Premolar
- Molar
5. The main function of the lungs is the process of gas exchange called respiration . In respiration, oxygen from incoming air enters the blood, and carbon dioxide, a waste gas from the metabolism, leaves the blood.
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Answer:
Answer below
Explanation:
Ans1: A group of organs that perform a specific task is called an organ system.
For ex: Circulatory system , Nervous system, Digestive system etc.
Ans2: Digestion is a process in which food gets digested in our body that provides energy to body. The process of digestion starts from the mouth.
Ans3: The heart along with all arteries and veins form the circulatory system. The main function of circulatory system is to transport blood in all part of the body through arteries and veins . The arteries carry the blood rich in Oxygen from the heart to all parts of the body. The Veins carry the blood from organs rich in carbon dioxide to the heart. This is called the circulatory system.
Ans4: The four types of teeths are :
Inscissors
Canines
Molars
Premolars
Ans5: The lungs perform the most important role in the respiratory system. It receives oxygen through the wind pipe and wind pipe from the nose . The lungs takes the oxygen and the Oxygen is absorbed by the bronchioles and give out carbon dioxide .