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Practice each question, then open the answer or worked solution.
Rearrange the following in the correct order of involvement in electrical impulse movementSynaptic knob, dendrites, cell body, Axon terminal, Axon
The correct order of involvement of the given parts of neuron in electrical impulse is-
Dendrites → Cell body → Axon → Axon terminal → Synaptic knob
Comment upon the role of the ear in maintaining the balance of the body and posture.
Maintaining the balance of the body and posture is done by the inner ear. There are two parts which are semicircular canals and vestibules, that are involved in the balancing.
Which cells of the retina enable us to see coloured objects around us?
The cone cells present inside the retina enable us to see coloured objects around us.
Arrange the following in the order of reception and transmission of a sound wave from the eardrum: Cochlear nerve, external auditory canal, eardrum, stapes, incus, malleus, and cochlea.
The order of reception and transmission of the sound wave from the eardrum is –
Ear Drum → Malleus → Incus → Stapes → Cochlear → Cochlear nerve
During resting potential, the axonal membrane is polarized, indicate the movement of +ve and –ve ions leading to polarisation diagrammatically.
Name the structures involved in the protection of the brain.
The human brain is protected by the skull. Inside the skull, there are cranial meninges that cover the brain. The cranial meninges are made up of three layers, namely – Dura mater (outer layer), Arachnoid (middle layer) and Pia mater (inner layer which is in contact with the brain). Dura mater is a thick, tough, fibrous membrane. Arachnoid is a membrane with a spider-like structure. The parameter is a very thin, delicate and vascular membrane. The space between dura mater and arachnoid is called subdural space. The space between arachnoid and parameter is called subarachnoid space. It is filled with cerebrospinal fluid, which acts as a cushion for CNS from shock.
Our reactions like aggressive behaviour, use of abusive words, restlessness etc. are regulated by the brain, name the parts involved
The limbic system (the inner part of the cerebral hemisphere and a group of associated deep structures) and hypothalamus (a small region located at the base of the brain near the pituitary gland)
What do grey and white matter in the brain represent?
Grey matter – The cerebral cortex is referred to as Grey matter due to its greyish appearance
White matter – Fibres of the tract are covered with a myelin sheath.
Where is the hunger centre located in the human brain?
The hunger centre is located in hypothalamus in the human brain.
Which sensory organ is involved in vertigo (sensation of oneself or objects spinning around)?
The vestibular system of the inner ear is associated with vertigo.