Question 11 MarkWhat regulates the ionic gradient?AnswerIonic gradient is regulated by sodium potassium pump.View full question & answer→
Question 21 MarkWhy are neurons excitable cells?AnswerNeurons are excitable cells because their membrane remains in a polarised state.View full question & answer→
Question 31 MarkHow many pairs of cranial nerves are found in humans?AnswerThere are 12 pairs of cranial nerves found in humans.View full question & answer→
Question 41 MarkWhat is called Threshold Stimulus?AnswerThe minimum stimulation strength required to excite the nerve fibre is called Threshold Stimulus.View full question & answer→
Question 51 MarkWhich nervous system is called Cranio-sacral system?AnswerParasympathetic nervous system is called Cranio-sacral system.View full question & answer→
Question 61 MarkWhat is the nature of spinal nerves?AnswerSpinal nerves are of mixed nature.View full question & answer→
Question 71 MarkWhat is called stimulus?AnswerAny phenomenon occurring in the external or internal environment which is capable of exciting the nerve or body is called stimulation.View full question & answer→
Question 81 MarkDefine autonomic nervous system.AnswerThe nervous system associated with the regulation and operation of involuntary functions of the body is called the autonomic nervous system.View full question & answer→
Question 91 MarkWhat is corpus callosum? Where is it found?AnswerIn humans, the transverse band connecting the cerebral hemispheres is called corpus callosum. It is found beneath the cerebral cortex in the brain.View full question & answer→
Question 101 MarkHow many sodium ions go out and how many potassium ions enter the cell per cycle through the sodium potassium pump?AnswerThrough sodium potassium pump, $3 N a ^{+}$moves out and $2 K ^{+}$enters the cell.View full question & answer→
Question 111 MarkWhere are Nissl granules found? Write their work.AnswerNissl granules are found in the cell body (soma) of neurons. Their function is helpful in excretion and nutrition.View full question & answer→
Question 121 MarkThe somatic nervous system transmits stimuli from the central nervous system to which organs and muscles of the body?AnswerSomatic nervous system transmits stimuli from central nervous system to the involuntary organs and smooth muscles of the body.View full question & answer→
Question 131 MarkWhat is called depolarised stage?AnswerIf the nerve fibre is negatively charged on the outside and positively charged on the inside, then it is called depolarised stage.View full question & answer→
Question 141 MarkWhat is called nerve impulse?AnswerExcitation of nerve cells due to stimulation is called nerve impulse.View full question & answer→
Question 151 MarkWrite the name of nerve impulse transmission.AnswerThe name of the neurotransmitter substance used in nerve impulse transmission is acetylcholine.View full question & answer→
Question 161 MarkWhat is synapse?AnswerA nerve impulse is transmitted from one neuron to another through junctions called synapse.View full question & answer→
Question 171 MarkHow many types of axons are there? Write the name.AnswerThere are two types of axons- (1) myelinated and (2) non-myelinatedView full question & answer→
Question 181 MarkFrom which embryonic level is the nervous system formed?AnswerThe nervous system is formed from the ectoderm at the embryonic level.View full question & answer→
Question 191 MarkHow many axons emerge from a nerve cell?AnswerOne axon emerges from a nerve cell.View full question & answer→
Question 201 MarkWrite the names of two types of nerves found in the peripheral nervous system.Answer(i) Sensory or afferent, (ii) Conductor/motor or efferent.View full question & answer→
Question 211 MarkInto which two parts is the human nervous system divided?Answer(i) Central nervous system, (ii) Peripheral nervous system.View full question & answer→
Question 221 MarkIn what form is the nervous system in Hydra?AnswerIn Hydra the nervous system is in the form of nerve net.View full question & answer→
Question 231 MarkThe nervous system is made up of which highly specialised type of cells?AnswerNervous system is made up of highly specialised types of cells called neurons.View full question & answer→