Q5 of 61 Page 58

Which is the correct sequence of the components of a reflex arc?

The path through which signals are transmitted from a receptor to a muscle or a gland is called reflex arc.


The correct sequence of the components of a reflex arc is –


Receptors Sensory neuron Spinal cord Motor neuron Muscle


Stimulus received by the sensory receptors. Then sensory neuron or nerve carries signals from receptors to spinal cord. Impulses travels from the spinal cord to the motor neuron. The end of motor neuron connects effector organ or muscles which produce response.

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In a synapse, chemical signal is transmitted from

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In a neuron, conversion of electrical signal to a chemical signal occurs at/in

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Which of the following statements are true?

1. Sudden action in response to something in the environment is called reflex action.


2. Sensory neurons carry signals from spinal cord to muscles.


3. Motor neurons carry signals from receptors to spinal cord.


4. The path through which signals are transmitted from a receptor to a muscle or a gland is called reflex arc.

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Which of the following statements are true about the brain?

1. The main thinking part of brain is hind brain.


2. Centres of hearing, smell, memory, sight, etC. are located in forebrain.


3. Involuntary actions like salivation, vomiting, blood pressure are controlled by the medulla in the hindbrain.


4. Cerebellum does not control posture and balance of the body