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Class 5 Science Question Answers - Nervous System

Q1: What is the main function of our nervous system, and why is it important for our body?
Ans: The main function of our nervous system is to make us aware of our surroundings and control all other body systems and sense organs. It helps us see, read, write, think, learn, feel, and respond. It is important because it allows our body to interact with the world and coordinate various activities.


Q2: Which organ serves as the control center of our body, and how does it send and receive messages?
Ans: The brain is the control center of our body. It sends and receives messages from different parts of the body through the spinal cord and nerves. These messages are essential for controlling our body's functions.


Q3: How is the brain protected, and what is the function of the fluid surrounding it?
Ans: The brain is protected by a bony structure called the skull. The space between the brain and the skull is filled with fluid that acts as a shock absorber, safeguarding the brain from impacts and injuries.


Q4: What is the cerebrum, and what functions does it control?
Ans: The cerebrum is the largest part of the brain. It controls our sense organs, intelligence, voice, thinking, learning, memory, and emotions.


Q5: What is the cerebellum, and what is its role in our body?
Ans: The cerebellum is the second-largest part of the brain, situated below the cerebrum. It controls and coordinates voluntary muscle actions like running, walking, dancing, and balancing our body.


Q6: What is the medulla oblongata, and what functions does it perform?
Ans: The medulla oblongata, also known as the brain stem, connects the brain to the spinal cord. It controls involuntary actions such as breathing and heart rate.


Q7: Describe the spinal cord's location and its role in the nervous system.
Ans: The spinal cord is a long bundle of nerves that runs down from the medulla to the lower end of the backbone, protected by the vertebral column. It carries messages between the brain and the rest of the body through nerves and controls actions that do not involve the brain, known as reflex actions.


Q8: What are nerves, and how do they transmit messages in our body?
Ans: Nerves are thread-like structures that extend from the brain and spinal cord to all body parts. They are composed of bundles of fibers (neurons) through which impulses pass between the brain or other body parts. Nerves transmit messages throughout our body.


Q9: Explain the different types of nerves and their functions.
Ans: There are three types of nerves:

  • Sensory Nerves: These carry messages from sense organs to the brain or spinal cord, conveying information about temperature, smell, color, or pressure.
  • Motor Nerves: These send messages from the brain or spinal cord to muscles, making muscles move.
  • Mixed Nerves: These connect sensory and motor nerves, carrying messages both to and from the brain or spinal cord and various organs.


Q10: What is a reflex action, and can you provide an example of one?
Ans: A reflex action is an automatic, quick response our body makes to a stimulus, often without conscious thought. It is controlled by the spinal cord without involving the brain. For example, when we touch a sharp object, the sensory nerves in our finger send a pain message to the spinal cord, which quickly sends a command through motor nerves to move the hand away from the sharp object to avoid injury.

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FAQs on Class 5 Science Question Answers - Nervous System

1. What is the function of the nervous system?
Ans. The nervous system is responsible for coordinating and controlling the body's actions and reactions. It helps in transmitting signals between different parts of the body and the brain, allowing us to move, think, and feel.
2. What are the two main components of the nervous system?
Ans. The two main components of the nervous system are the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS includes the brain and spinal cord, while the PNS consists of the nerves that extend throughout the body.
3. How does the nervous system transmit information?
Ans. The nervous system transmits information through electrical signals called nerve impulses. These impulses travel along the nerves, allowing communication between different parts of the body and the brain. Chemical messengers called neurotransmitters are also involved in transmitting signals between nerve cells.
4. What are the main parts of the brain?
Ans. The main parts of the brain include the cerebrum, cerebellum, and brainstem. The cerebrum is responsible for thinking, memory, and voluntary movements. The cerebellum controls balance and coordination, while the brainstem regulates basic functions such as breathing and heart rate.
5. How does the nervous system help in responding to danger?
Ans. When the nervous system detects danger, it triggers a response known as the "fight or flight" response. This response prepares the body to either confront the danger or escape from it. It involves physiological changes such as increased heart rate, heightened senses, and the release of stress hormones like adrenaline.
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