Test: Neural Control & Coordination - 2 - NEET MCQ

Different parts of human brain have specializedarea for different receptors. Visual area is located in occipital lobe. General sensory area are located in parietal lobe, smell area is located in frontal area. Speech area is not located in parietal lobe.

Human nervous system consists of central nervous system and peripheral nervous system. Peripheral nervous system includes 12 pairs of cranial nerves emerging from brain and 31 pairs of spinal nerves arising from spinal nerve.

The middle layer, choroid contains many blood vessels and looks bluish in colour.

Reticular activating system (RAS) of brain works as a bridge to connect the lower brain to the upper brain. It helps to focus on the important things and evade useless things

The synapse is formed by the membranes of apre-synaptic neuron and a post-synaptic neuron, which may or may notbe separated by a gap called synaptic cleft. The neurotransmitter receptors are located on postsynaptic membrane

The sensory organs detect all types of changes in the environment and send appropriate signals to the CNS, where all the inputs are processed and analysed.

The choroid layer in human eye darkens the cavity of eyeball to prevent internal reflection of light. The blood vessels of choroid layer nourish the retina. The shape of eye lens is changed by ciliary muscles.

Refractory period is the time taken to nerve become ready to conduct other impulse. Due to this refractory period, a nerve fibre in human body on an average transmits about 1000 impulses per seconds.

In the human eye, there are three types of cones which possess their own characteristic photopigments that respond to red, green and blue lights. The sensations of different coloursare produced by various combinations of these cones and their photopigments.

Human eyes contain iris that is responsible for changing size of people to allow or preventthe amount of light entering the eyeball. Cons cells present in retina are responsible for colour perception.

The layer of cells which covers the cerebral hemisphere is called cerebral cortex and is throwninto prominent folds.

While crying, tears come out of eyes. Sometimes water fluid also comes out of the nose as well. This water fluid coming out of the nose is due to excessive secretion of lacrimal glands.

Human body is triploblastic in nature, ectoderm, mesoderm and endoderm. These three layers of embryo forms thedifferent organs of human beings. Human internal ear is ectodermal in origin.

The autonomic nervous system or ANS is the division of peripheral nervous system that influences the function of internal organs. ANS is also known as VNS. These nerves transmit impulse from CNS to involuntary organs and smooth muscles.

There are three differentkinds of bone present in middle ear of human beings to amplify the sound receivedby ear. Stapes is stir-up shaped, external auditory canal is S-shaped, Malleus is hammer shaped and incus is anvil shaped.

Bipolar neurons are found in the retina of the eye. They possess one axon and one dendrite. The cerebral cortex and autonomic ganglia have multipolar neurons. Unipolar neurons are found in embryo.

• The inner parts of cerebral hemispheres and a group of associated deep structures like amygdala, hippocampus, etc., form a complex structure called the limbic lobe or limbic system.
• Along with the hypothalamus, it is involved in the regulation of sexual behaviour, expression of emotional reactions (e.g., excitement, pleasure, rage and fear), and motivation.

The hemispheres are connectedby a tract of nerve fibres called corpus callosum.