Which of the following statements are true?
(i) sudden action in response to something in the environment is called reflex action.
(ii) sensory neurons carry electrical signals from spinal cord to muscles in a reflex action.
(iii) motor neurons carry signals from receptors to spinal cord in a reflex action.
(iv) the pathway of transmitting signals from a receptor to a muscle is a reflex action.

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Solution

Correct Option: (c)- (i) and (iv).

The quick response that is taken in response to the stimulus from the surrounding is called reflex action. It does not involve the use of the brain and only involves the spinal cord and peripheral nervous system.

The electrical signal is generated at the receptors and is then carried to the spinal cord through the sensory neurons. From the spinal cord, the impulse is transmitted to muscles through the motor neurons. This path is called the reflex arc.

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Question 6
Which of the following statements are true?

(i) Sudden action in response to something in the environment is called reflex action.

(ii) Sensory neurons carry signals from the spinal cord to muscles.

(iii) Motor neurons carry signals from receptors to the spinal cord.

One of the following gives the correct sequence of the components in a reflex arc. This is :

(a) Receptors $\to$ Muscle $\to$ Sensory neuron $\to$ Motor neuron $\to$ Spinal cord

(b) Receptors $\to$ Motor neuron $\to$ Spinal cord $\to$ Sensory neuron $\to$ Muscle

(d) Receptors $\to$ Sensory neuron $\to$ Spinal cord $\to$ Motor neuron $\to$ Muscle

Which of the following statements are true?

(i) Sudden action in response to something in the environment is called reflex action.

(ii) Sensory neurons carry signals from the spinal cord to muscles.

(iii) Motor neurons carry signals from receptors to the spinal cord.

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