Class 3 Exam > Class 3 Notes > Science for Class 3 > Short Answer Questions : Human Body : Organ Systems
Short Answer Questions : Human Body : Organ Systems | Science for Class 3 PDF Download
Q1: What are the tiny building blocks of the human body called?
Ans: The tiny building blocks of the human body are called cells. Cells join together to form tissues.
Q2: What does the skeletal system give to our body?
Ans: The skeletal system gives our body shape and support. It has 206 bones in adults.
Q3: How do bones protect our body?
Ans: Bones protect important organs like the brain, heart, and lungs. The skull, ribcage, and backbone keep them safe.
Q4: What is the job of the muscular system?
Ans: The muscular system helps us move our body parts. It has over 600 muscles. Muscles are soft parts that connect to bones and help us move, like blinking, walking, or jumping.
Q5: What does the digestive system do with food?
Ans: The digestive system breaks down food into simpler forms that the body can use for energy to do daily activites.
Q6: What are the main parts of the circulatory system?
Ans: The circulatory system includes the heart, blood, and blood vessels. It carries nutrients and oxygen to the body.
Q7: How does the respiratory system help us?
Ans: The respiratory system helps us breathe. It uses the nose, windpipe, and lungs to take in oxygen.
Q8: What does the nervous system control?
Ans: The nervous system controls all organs with the brain, spinal cord, and nerves. It helps us think, act, and learn.
Q9: Name two sense organs and their functions.
Ans:
1. Eyes: Our eyes help us see things. They show us pictures of what is around us.
2. Ears: Our ears allow us to hear sounds.
Q10: What does the excretory system remove from the body?
Ans: The excretory system removes waste like urine, sweat, and carbon dioxide. Kidneys, lungs, and skin help keep the body clean.
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FAQs on Short Answer Questions : Human Body : Organ Systems - Science for Class 3
| 1. What are the main organ systems in the human body? |  |
Ans. The main organ systems in the human body include the circulatory system, respiratory system, digestive system, nervous system, muscular system, skeletal system, endocrine system, and immune system. Each of these systems has specific functions that work together to maintain overall health and well-being.
| 2. How do the organ systems work together? | |
Ans. The organ systems in the human body work together in harmony. For example, the respiratory system brings in oxygen, which the circulatory system then transports to cells. The digestive system breaks down food into nutrients, and the circulatory system delivers these nutrients to the cells as well. This cooperation ensures that all body functions are performed efficiently.
| 3. What is the function of the heart in the circulatory system? | |
Ans. The heart is a vital organ in the circulatory system. Its main function is to pump blood throughout the body. This blood carries oxygen and nutrients to the tissues and organs while also removing waste products like carbon dioxide. The heart beats continuously to maintain this circulation.
| 4. Why is the nervous system important? | |
Ans. The nervous system is important because it controls and coordinates all body activities. It allows for communication between different parts of the body and helps respond to external stimuli. The brain, spinal cord, and nerves work together to process information and send signals that result in actions, making it essential for survival.
| 5. What role does the digestive system play in the human body? | |
Ans. The digestive system plays a crucial role in breaking down food into smaller molecules that the body can use for energy, growth, and repair. It involves various organs, including the mouth, stomach, and intestines, working together to digest food, absorb nutrients, and eliminate waste.
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