Reflex Action

Q.

Spinal cord is involved in reflex action. It is the processing unit for reflex actions because __________.

1. Spinal cord occupies more space in the body.

2. It can have more nerve connection.

3. All nerves from various parts of body meet at spinal cord before reaching brain.

4. All of these

Q. The neurons which carry away nerve impulses from the CNS to receptor organs are known as ___ .

1. Interneurons
2. Sensory neurons
3. Motor neurons
4. Peripheral neurons

Q.

Which of the following is a reflex action?

1. blinking of eyes

2. coughing

3. swallowing of bolus

4. all of these

Q.

Our body carries out reflex actions without the control of brain. Which other part of the nervous system is responsible for this?

1. Balance and equilibrium

2. Thinking and memory

3. Reflex actions

4. All the above

Q.

What is cerebral palsy?

Q. The neurons which carry away nerve impulses from the CNS to receptor organs are known as ___ .

1. Interneurons
2. Sensory neurons
3. Motor neurons
4. Peripheral neurons

Q.

Give an important characteristic of a muscle cell.

Q.

Why the nerve cell is so long?

Q. What is the role of brain in reflex actions? Is this ans correct that brain has no direct role in reflex actions it is mainly controlled by spinal cord as these actions are ver quick and do not require thinking

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

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

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

Q. Label the following diagram:

1. 1 - Receptor, 2 - Spinal cord, 3 - Sensory neuron, 4 - Afferent neuron, 5 - Interneuron, 6 - Effector
2. 1- Spinal cord, 2 - Receptor, 3 - Sensory neuron, 4 - Interneuron, 5 - Motor neuron, 6 - Effector
3. 1 - Spinal cord, 2 - Effector, 3 - Sensory neuron, 4 - Afferent neuron, 5 - Interneuron, 6 - Receptor
4. 1 - Effector, 2 - Spinal cord, 3 - Sensory neuron, 4 - Afferent neuron, 5 - Interneuron, 6 - Receptor

Q.

Our body carries out reflex actions without the control of brain. Which other part of the nervous system is responsible for this?

1. Spinal Cord

2. Brain
3. Liver
4. Heart

Q.

Reflex action in the body is controlled by ___________.

1. ANS

2. PNS

3. All of these

4. CNS

Q.

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

1. True

2. False

Q.

The possible reason for evolution of reflex action in higher animals is:

1. Spinal cord has more efficiency than brain

2. Thinking process of brain is not fast enough.

3. Multicellular organisms are more complex in design.

4. All sense organs are not connected to brain.

Q. Short Answer Question :
Write one word in the space provided to complete the second pair of the related words pertaining to the nervous system :
Memory : cerebrum : : breathing : .......

Q. Which of the following part of nervous system regulates the internal and involuntary movement?

1. Both A and B
2. Parasympathetic
3. Cerebellum
4. Sympathetic