Neural Control and Coordination Test - 38

• The different cells in the body can regenerate in order to replace the damaged or the worn-out cells. 
• The neurons are one of the brain cells. The cells divide during the embryonal stage. After the birth of a child, the cells lose their capacity to divide. 
• These cells have the least capacity of regeneration. 
• Thus, the correct answer is option C. 

• The blind spot is the region in the posterior part of the eye. There are no photoreceptor cells, rods and cone cells are absent in this region.
• The rods and the cones are the cells that can detect light and help in the formation of the image. 
• As the light cannot be detected, there is no image formation at this spot.

• The membrane which covers the brain and the spinal cord is called as the meninges. 
• There are three layers of the meninges. The outermost is the Dura mater, middle one is the arachnoid mater and the innermost is the pia mater. 
• Dura mater is the tough membrane which is present in the outermost region. The three meninges provide protection to the brain from shock and injury. 
• Thus, the correct answer is option B. 

In humans, the brain is highly developed as compared to other organisms found on the earth. The cerebral cortex of the brain is involved in the speech ability in the humans. So, the humans have better capability to speak and converse with respect to the other animals.

The dendrites are the short, cytoplasmic extension which is present in the sensory organs and are responsible for the reception of the electric impulse. The dendrite passes the electric impulse to the cell body which passes the impulse to the axon. The axon is the long cytoplasmic extension of the neuron. There are telodendrons which are present at the tail of the axons. These regions can release neurotransmitters which can help in the transmission of the impulse through the synapse to the next neuron.

The cerebrum is the largest part of the brain. The cerebrum is made up of two cerebral hemispheres and their cortices. These two cerebral hemispheres are connected through the corpus callosum. This brings about the communication between the two hemispheres. It is mostly made of white matter. Thus the correct answer is option D.

The cerebral cortex is divided into lobes and the different lobes are involved in different functions due to the regions or centers. The centers for the detection of the sensation of touch, pain, and the temperature is controlled by the parietal lobe of the cerebral cortex. 

• The lateral sulcus serves to separate the temporal lobe from the frontal and parietal lobe. 
• Central sulcus serves to separate the frontal and parietal lobe. Longitudinal fissure serves to separate the two cerebral hemispheres. 
• Parieto-occipital sulcus serves to mark the boundary between parietal and occipital lobe.

 

Schwann cells are cells in the peripheral nervous system that wraps around the axons of motor and sensory neurons to form the myelin sheath.

It makes the conduction of impulses through the neuron more efficient.

Thus, the correct answer is option A.

The Broca's area is a portion in the frontal lobe at the left cerebral hemisphere. This area is involved in the production of speech and language comprehension. It is also involved in motor-related processes and speech-related gestures. 
Thus the correct answer is option D.