Neural Control and Coordination Test

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Neural Control and Coordination Test - 77

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Weekly Quiz Competition

Question 1

1 / -0

Which of the following statements are true for "Motot cortex"?

(i)	It is located in the frontal lobe of cerebral cortex
(ii)	It contains pyramidal cell
(iii)	It is responsible for all visual functions
(iv)	It is essential for our thought processes
(v)	It stimulates wakefulness
(vi)	It regulate voluntary muscular movements

(i), (ii), (iii) and (iv)

(ii), (iii), (iv) and (v)

(ii), (iv), (v) and (vi)

(i), (ii), (iv) and (vi)

Solution

The motor cortex is the region which controls the motor activities. This region is located in the dorsal portion of the frontal lobe of cerebral cortex. This region contains very big and giant pyramidal-shaped neurons. These cells are called as Betz cells. This region plays an important role in the regulation and control of planning, thinking and other voluntary activities. This region is involved in the thoughts processing. The region is important for decision making and performing voluntary movements including the bones and muscles. Thus, the correct answer is option D.

Question 2
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Node of Ranvier occurs where

A
Nerve is covered with myelin sheath

B
Neurolemma is discontinuous

C
Neurolemma and myelin sheath are discontinuous

D
Myelin sheath is discontinuous
Solution
- Myelin sheath is a fat layer formed by the Schwann cells that surround the axon.
- They are not continuous but leave gaps in between called the nodes of Ranvier
So, the correct answer is 'Myelin sheath is discontinuous'
Question 3
1 / -0

Which of the following protion of the brain is associated with the motor control of speech?

A
The parietal lobe

B
The cerebellum

C
The occipital lobe

D
The frontal lobe

E
The lateral sulcus

Solution

The frontal lobe of the cerebral hemisphere is responsible for the motor control of speech. Frontal lobes are involved with personality, speech, and motor development. Temporal lobes are responsible for memory, language and speech functions. Parietal lobes are involved with sensation. Occipital lobes are the primary vision centres. thus, the correct answer is option D.
Question 4
1 / -0

A typical neuron has a myelin sheath insulating its axon. It is formed from cells known as Schwann cells. Some nervous system disorders, such as adrenoleukodystrophy result from the deterioration of the myelin sheath.
Why is the myelin sheath important to the correct functioning of the neuron?

A
The surface of the myelin sheath carries many receptors for neurotransmitters, allowing the neuron to receive chemical signals

B
Gaps in the myelin sheath allow for saltatory conduction, where electrical impulses jump from one covered area to another

C
The myelin sheath blocks external signals that originate outside the neuron, preventing interference with nervous signal transmission

D
None of these

Solution

Schwann cells that constitute the myelin sheath, are lipid-rich cells that create a biological insulation over axon and do not allow the free flow of electrical impulses through it. The myelin sheath is discontinuous and the gaps are called nodes of Ranvier. This gap has no insulation and thus allow the electrical impulses to pass through and allow saltatory conduction. So electrical impulses jump from one covered area to another.
So the correct answer is B.
Question 5
1 / -0

Corpus callosum occurs in the brain of

A
Pigeon

B
Frog

C
Crocodile

D
Elephant

Solution

The corpus callosum is present only in placental mammals and hence the only elephant from the above options classify in this category. It is presently under the cerebral cortex in the brain. Pigeon, frog, crocodile are avians, amphibians, and reptilians respectively. So corpus callosum is absent in these three.
So the correct answer is 'Elephant'.
Question 6
1 / -0

Birds, bees and bacteria are able to navigate their path with the help of

A
Brain

B
Hormones

C
Intuition

D
Magnetoreception

Solution

The correct option is D.
Magnetoreception (also magnetoception) is a sense which allows an organism to detect a magnetic field to perceive direction, altitude or location. This sensory modality is used by a range of animals for orientation and navigation and as a method for animals to develop regional maps. In navigation, magnetoreception deals with the detection of the Earth's magnetic field.
Question 7
1 / -0

Spinal cord and sympathetic ganglion of autonomous nervous system are connected by

A
Ramus ventralis

B
Ramus communicans

C
Ramus dorsalis

D
Connective

Solution

Ramus communicans is the branch which connects the spinal cord and the sympathetic trunk. There are two forms of ramus communicans. They are gray ramus communicans and white ramus communicans. They are responsible for conduction of signals in the sympathetic nervous system. The white rami communicans outflow from the spinal cord. The gray rami communicans are composed of largely unmyelinated neurons.
Thus, the correct answer is option B.
Question 8
1 / -0

Grey matter is composed of

A
Ependymal cells

B
Nerve cells

C
Nerve fibres

D
Nissl granules

Solution

The grey matter refers to that part of the neuron which is not surrounded by the myelin sheath. The nerve cells or the cyton or the soma along with the dendrites are not covered with the myelin sheath. So they constitute the grey matter.
A. Ependymal cells are the glial cells present in the choroid plexus that take part in the formation of the cerebrospinal fluid.
B. Nerve cells form the grey matter.
C. If nerve fibres myelinated they will form the white matter.
D. Nissl granules are the ribosomes present in the nerve cell.
Hence, the correct answer is 'Nerve cells'
Question 9
1 / -0

White matter is composed of

A
Nerve cells

B
Nerve fibres

C
Ependymal cells

D
None of the above

Solution

White matter is composed of the nerve fibres or the axons that are surrounded with the Schwann Cells secreting the myelin sheath. As the myelin sheath is made up of the fats, it appears white in colour and the myelinated nerve fibres are called the white matter.
A. Nerve cells include the cyton and dendrites as well that are never myelinated.
B. Nerve fibres can be myelinated and form the white matter.
C. Ependymal cells are the glial cells.
Hence, the correct answer is 'Nerve fibres'
Question 10
1 / -0

Lateral funiculi possess ganglia

A
Sensory

B
Motor

C
Both A and B

D
None of the above

Solution

Lateral funiculi are part of white matter of spinal cord having myelinated nerve fibres. Cell bodies/ganglia occur in grey matter that lies inside and in horns of spinal cord.

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Neural Control and Coordination Test - 77

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Neural Control and Coordination Test - 77

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Question 1

(i), (ii), (iii) and (iv)

(ii), (iii), (iv) and (v)

(ii), (iv), (v) and (vi)

(i), (ii), (iv) and (vi)

Solution

Question 2

Nerve is covered with myelin sheath

Neurolemma is discontinuous

Neurolemma and myelin sheath are discontinuous

Myelin sheath is discontinuous

Solution

Question 3

The parietal lobe

The cerebellum

The occipital lobe

The frontal lobe

The lateral sulcus

Solution

Question 4

The surface of the myelin sheath carries many receptors for neurotransmitters, allowing the neuron to receive chemical signals

Gaps in the myelin sheath allow for saltatory conduction, where electrical impulses jump from one covered area to another

The myelin sheath blocks external signals that originate outside the neuron, preventing interference with nervous signal transmission

None of these

Solution

Question 5

Pigeon

Frog

Crocodile

Elephant

Solution

Question 6

Brain

Hormones

Intuition

Magnetoreception

Solution

Question 7

Ramus ventralis

Ramus communicans

Ramus dorsalis

Connective

Solution

Question 8

Ependymal cells

Nerve cells

Nerve fibres

Nissl granules

Solution

Question 9

Nerve cells

Nerve fibres

Ependymal cells

None of the above

Solution

Question 10

Sensory

Motor

Both A and B

None of the above

Solution

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