Neural control: neuron, nervous system, nerve impulse

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Given below are two statements :Statement I : The cerebral hemispheres are connected by nerve tract known as corpus callosum.Statement II : The brain stem consists of the medulla oblongata, pons and cerebrum.In the light of the above statements, choo… Answer: 4. Statement I is correct but Statement II is incorrect. Statement I is correct. The corpus callosum is the nerve tract joining the... Neural control: neuron, nervous system, nerve impulse 1 answer
Match List I with List II :List I:A. PonsB. HypothalamusC. MedullaD. CerebellumList II:I. Provides additional space for Neurons, regulates posture and balance.II. Controls respiration and gastric secretions.III. Connects different regions of the brai… Answer: 3. A-III, B-IV, C-II, D-I Pons - fibre tracts that connect different regions of the brain (A-III). Hypothalamus - contains neurosecr... Neural control: neuron, nervous system, nerve impulse 1 answer
The parts of human brain that helps in regulation of sexual behaviour, expression of excitement, pleasure, rage, fear etc. are : Answer: 2. Limbic system & hypothalamus Key idea: The limbic system together with the hypothalamus controls emotions and behaviour. It regul... Neural control: neuron, nervous system, nerve impulse 1 answer
Match List I with List II with respect to human eye.List I: A. Fovea; B. Iris; C. Blind spot; D. ScleraList II: I. Visible coloured portion of eye that regulates diameter of pupil.; II. External layer of eye formed of dense connective tissue.; III. P… Answer: 2. A-III, B-I, C-IV, D-II Key idea: Match each eye part with its function. Fovea: point of greatest visual acuity (III). Iris: visib... Neural control: neuron, nervous system, nerve impulse 1 answer
Select the incorrect statement regarding synapses : Answer: 1. Impulse transmission across a chemical synapse is always faster than that across an electrical synapse. Key idea: Electrical syna... Neural control: neuron, nervous system, nerve impulse 1 answer
Match the following columns and select the correct option.Column - I | Column - II(a) Organ of Corti | (i) Connects middle ear and pharynx(b) Cochlea | (ii) Coiled part of the labyrinth(c) Eustachian tube | (iii) Attached to the oval window(d) Stapes… Answer: 3. (a) (iv), (b) (ii), (c) (i), (d) (iii) Organ of Corti sits on the basilar membrane: (a) - (iv). Cochlea is the coiled part of the... Neural control: neuron, nervous system, nerve impulse 1 answer
Which of the following statements is correct ? Answer: 4. Cornea consists of dense matrix of collagen and is the most sensitive portion of the eye. Key idea: The cornea is made of dense c... Neural control: neuron, nervous system, nerve impulse 1 answer
Which part of the brain is responsible for thermoregulation ? Answer: 2. Hypothalamus The hypothalamus contains the thermoregulatory centre. It also controls hunger, thirst and hormone release. The cere... Neural control: neuron, nervous system, nerve impulse 1 answer
Nissl bodies are mainly composed of Answer: 4. Free ribosomes and RER Key idea: Nissl bodies are granular masses in the cell body and dendrites of neurons. They are made of fre... Neural control: neuron, nervous system, nerve impulse 1 answer
Which of the following structures or regions is incorrectly paired with its function ? Answer: 3. Limbic system : consists of fibre tracts that interconnect different regions of brain; controls movement. Key idea: Find the pair... Neural control: neuron, nervous system, nerve impulse 1 answer
The transparent lens in the human eye is held in its place by Answer: 1. ligaments attached to the ciliary body Key idea: The lens is suspended by the suspensory ligaments (zonular fibres). These ligame... Neural control: neuron, nervous system, nerve impulse 1 answer
Good vision depends on adequate intake of carotene-rich food.Select the best option from the following statements.(a) Vitamin A derivatives are formed from carotene.(b) The photopigments are embedded in the membrane discs of the inner segment.(c) Ret… Answer: 1. (a), (c) and (d) Go statement by statement. (a) True: vitamin A derivatives form from carotene. (b) False: photopigments lie in t... Neural control: neuron, nervous system, nerve impulse 1 answer
Myelin sheath is produced by : Answer: 4. Schwann Cells and Oligodendrocytes The myelin sheath is formed by glial cells that wrap around axons. In the peripheral nervous s... Neural control: neuron, nervous system, nerve impulse 1 answer
Receptor sites for neurotransmitters are present on : Answer: 3. post-synaptic membrane Key idea: At a chemical synapse the neurotransmitter crosses the cleft and binds to receptors on the next... Neural control: neuron, nervous system, nerve impulse 1 answer
Choose the correct statement. Answer: 2. Photoreceptors in the human eye are depolarized during darkness and become hyperpolarized in response to the light stimulus. Go t... Neural control: neuron, nervous system, nerve impulse 1 answer
Photosensitive compound in human eye is made up of : Answer: 2. Opsin and Retinal Key idea: The photosensitive pigment of the eye, rhodopsin (visual purple), is made of opsin (a protein) and re... Neural control: neuron, nervous system, nerve impulse 1 answer