Consider the following statements regarding 'Nerve Impulses': 1. They are signals that pass along the nerve fibre. 2. They are electrical signals that cannot trigger muscle movement. 3. The combination of nerve and muscle tissue is absent in animals. Which of the statements given above are correct?

Correct Option The correct option is (a). Explanation Nerve impulses are electrochemical signals that transmit information throughout the nervous system. They travel along neurons (nerve cells) and enable the body to react to stimuli by coordinating with effectors such as muscles and glands. Statement-wise Analysis - Statement 1 is Correct: A nerve impulse is a signal transmitted along a nerve fiber (axon). It propagates as a wave of electrical activity (action potential) along the membrane of the neuron. - Statement 2 is Incorrect: While nerve impulses are electrical signals, they do trigger muscle movement. When an impulse reaches the neuromuscular junction (the interface between a nerve and a muscle), it causes the release of neurotransmitters that stimulate the muscle fibers to contract. - Statement 3 is Incorrect: The functional combination of nerve and muscle tissue is present and is a fundamental characteristic of most animals. This coordination is essential for rapid movement in response to environmental stimuli. Key Takeaway: Nerve impulses are the primary mechanism for rapid internal communication in animals, directly facilitating muscle contraction and coordinated physical movement.

Consider the following statements regarding 'Nerve Impulses':… - NCERT Class 9 Science MCQ

NCERT Class 9 Science — Chapter 2: Tissues

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Consider the following statements regarding 'Nerve Impulses':

They are signals that pass along the nerve fibre.
They are electrical signals that cannot trigger muscle movement.
The combination of nerve and muscle tissue is absent in animals.

Which of the statements given above are correct?

NCERT textbook question

From NCERT Science - class 9 · Page 69

Options

A1 only
B2 only
C1 and 3 only
D1, 2 and 3

Did you get this right?

Solution

Correct Option

The correct option is (a).

Explanation

Nerve impulses are electrochemical signals that transmit information throughout the nervous system. They travel along neurons (nerve cells) and enable the body to react to stimuli by coordinating with effectors such as muscles and glands.

Statement-wise Analysis

Statement 1 is Correct: A nerve impulse is a signal transmitted along a nerve fiber (axon). It propagates as a wave of electrical activity (action potential) along the membrane of the neuron.
Statement 2 is Incorrect: While nerve impulses are electrical signals, they do trigger muscle movement. When an impulse reaches the neuromuscular junction (the interface between a nerve and a muscle), it causes the release of neurotransmitters that stimulate the muscle fibers to contract.
Statement 3 is Incorrect: The functional combination of nerve and muscle tissue is present and is a fundamental characteristic of most animals. This coordination is essential for rapid movement in response to environmental stimuli.

Key Takeaway: Nerve impulses are the primary mechanism for rapid internal communication in animals, directly facilitating muscle contraction and coordinated physical movement.

Your note

More from Chapter 2: Tissues

Consider the following statements regarding 'Complex Permanent Tissues': 1. They are made of more than one type of cell. 2. Each cell in the tissue functions independently without coordination. 3. Xylem and Phloem are examples of complex tissues. Which of the statements given above is/are correct?

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Consider the following statements about epithelial tissue: 1. It forms a barrier to keep different body systems separate. 2. It is directly connected to the underlying tissue without any separating membrane. 3. It contains large intercellular spaces to facilitate the movement of materials. Which of the statements given above is/are correct?

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Consider the following statements about 'Smooth Muscles': 1. They are also known as striated muscles. 2. They control involuntary movements like the movement of food in the alimentary canal. 3. They are multinucleate. Which of the statements given above are correct?

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With reference to the fundamental differences between plants and animals, consider the following statements: 1. Plants have a large quantity of supportive tissue which generally consists of dead cells. 2. Growth in plants is uniform throughout the body, whereas in animals it is limited to specific regions. 3. Animals consume more energy compared to plants due to active locomotion. Which of the statements given above is/are correct?

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Which one of the following is the most appropriate reason for the skin being made of 'Stratified Squamous Epithelium'?

easy

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