Reflex Arc and Reflex action

Q.

________ is the pathway of impulses to and from the spinal cord.

1. Reflex arc

2. Reflex pathway

3. Reflex route

4. Reflex journey

Q.

Which of the following statements are true?
(i) Sudden reaction in response to the stimulus is called the reflex action.
(ii) Sensory neurons carry signals from the spinal cord to the muscles.
(iii) Motor neurons carry signals from the receptors to the spinal cord.
(iv) The path through which signals are transmitted from a receptor to a muscle or a gland is called a reflex arc.

1. (i) and (ii)

2. (i) and (iii)

3. (i) and (iv)

4. (i), (ii) and (iii)

Q.

Identify the given pathway and label A, B, C, and D.

1. Reflex arc, A - Receptor, B - Sensory neuron, C - Motor neuron, D - Relay neuron

2. Central Nervous System, A - Electrical impulse, B - Sensory neuron, C - Motor neuron, D - Nerve ending

3. Peripheral Nervous System, A - Electrical impulse, B - Sensory neuron, C - Motor neuron, D - Nerve ending

4. Neuromuscular junction, A - Cell body, B - Sensory neuron, C - Motor neuron, D - Axon

Q.

Playing the harmonium without seeing its reeds is an example of reflex action.

1. True

2. False

Q.

Mark the parts labelled in the following diagram.

1. Neuromuscular junction, Cell body, Sensory neuron, Motor neuron

2. Central Nervous System, Electrical impulse, Sensory neuron, Motor neuron

3. Central Nervous System, Electrical impulse, Sensory neuron,
   Motor neuron

4. Receptor, Sensory neuron, Motor neuron, Relay neuron

Q. Arrange the path taken by an impulse in a reflex arc.

1. Spinal cord
2. Sensory neuron
3. Effector muscle
4. Motor neuron

Q. Identify the parts in the following pathway that leads to the removal of hand on touching a hot object.

1. Effector
2. Spinal cord
3. Afferent neuron
4. Efferent neuron

Q.

In an event of hand touching a hot object and taken back immediately, ________acts as a receptor and _____acts as effector organ.

1. Muscles, skin

2. Fingers, Upper arm

3. Hand, hand

4. Skin, muscles

Q.

The response in a reflex action is______

1. Very Slow

2. Fast

3. Regular

4. Very fast

Q.

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

1. $\text{Receptors}\to \text{muscles}\to \text{sensory neuron}\to \text{motor neuron}\to \text{spinal cord}$

2. $\text{Receptors}\to \text{sensory neuron}\to \text{spinal cord}\to \text{motor neuron}\to \text{muscles}$

3. $\text{Receptors}\to \text{spinal cord}\to \text{sensory neuron}\to \text{motor neuron}\to \text{muscles}$

4. $\text{Receptors}\to \text{motor neuron}\to \text{spinal cord}\to \text{sensory neuron}\to \text{muscles}$