Nervous System Video Lecture | Science Class 10

0:0:0: do you remember the time when one of
0:0:1: your friends pinched you I am sure you
0:0:5: reacted to it by pulling away
0:0:7: suddenly similar is the case when
0:0:9: someone tickles you or you touch some
0:0:11: hot object if you think more deeply
0:0:14: you'll realize that all these movements
0:0:16: are controlled and they are in response
0:0:18: to some external Trigger or
0:0:21: stimulus so in this video we'll see how
0:0:24: these movements are controlled and
0:0:26: coordinated in
0:0:27: animals the control and ordination in
0:0:30: all the animals is done by the nervous
0:0:33: system nervous system consists of a
0:0:36: network of neurons or nerve cells some
0:0:39: of these nerve cells have specialized
0:0:41: tips which detect the external Factor
0:0:45: these specialized tips are called
0:0:46: sensory
0:0:48: receptors all the sensory receptors are
0:0:50: present in the sense
0:0:52: organs some of the sensory receptors are
0:0:56: photo
0:0:57: receptors phor receptors alory
0:1:1: receptors gustatory
0:1:3: receptors Thermo
0:1:5: receptors the sensory receptors present
0:1:8: in the tongue are called gustatory
0:1:11: receptors these receptors detect
0:1:13: taste because of these receptors we can
0:1:16: say that the food is sweet or
0:1:19: salty similarly sensory receptors
0:1:22: present in our nose are called alory
0:1:24: receptors and these receptors detect
0:1:27: smell have you ever tried eating food by
0:1:30: blocking your nose this is weird right
0:1:34: just try eating food like this and you
0:1:36: will observe that all Factory and
0:1:38: gustatory receptors are required
0:1:40: together to satisfy your
0:1:42: pallet now let's have a look at the
0:1:44: structure of
0:1:46: neurons the neuron consist of cell body
0:1:52: dendrites and the
0:1:53: axon cell body is this spherical part of
0:1:57: the neuron which contains the nucleus
0:2:0: dendrites are the branches of the neuron
0:2:2: which receives the signal from the other
0:2:4: cells the axon is the longest dendrite
0:2:8: present in the neuron and it transmits
0:2:10: the signal to the other cells now let's
0:2:12: see how these nerve cells or neurons
0:2:15: function the main function of these
0:2:17: nerve cells is to receive conduct and
0:2:20: transmit the signals the dendrites of
0:2:23: the nerve cells receive the signal and
0:2:25: sets off a chemical
0:2:27: reaction this chemical reaction creates
0:2:30: an electrical impulse the impulse is
0:2:33: then transmitted from these dendrites to
0:2:35: the cell body and then to the axon from
0:2:38: the axon the signal is transmitted to
0:2:41: the dendrites of the other
0:2:43: neuron The Junction between the axon of
0:2:46: the first neuron and the dendrites of
0:2:48: the second neuron is known as
0:2:51: synapse at the end of the axon of the
0:2:53: first neuron the electrical impulse sets
0:2:55: off a chemical
0:2:57: reaction these chemicals generated by
0:2:59: this reaction cross the synapse and
0:3:1: generate the electrical impulses again
0:3:4: in the dendrite of the next
0:3:6: neuron and finally as I mentioned
0:3:8: earlier that the impulse from all these
0:3:10: nerve cells is transmitted to the cells
0:3:12: of the sensory organs like some muscle
0:3:15: cells or to some
0:3:16: glands here we can see how the axons are
0:3:19: transmitting the information to the
0:3:21: muscle
0:3:22: cells this quick movement of my hand
0:3:25: away from the Flames is called reflex or
0:3:27: reflex action so we can Define reflex
0:3:31: action as an involuntary instantaneous
0:3:33: movement in response to the external
0:3:36: stimulus when I put my hand over the
0:3:38: flame the signals from my hand are taken
0:3:41: up by the neurons and are transmitted to
0:3:43: the spinal cord these signals are
0:3:46: detected by the spinal cord and then the
0:3:48: spinal cord prepares the response which
0:3:50: is transmitted back from the spinal cord
0:3:52: to my hand and which makes me remove my
0:3:55: hand from the flame neurons that carry
0:3:58: the signals from all the parts of the
0:4:0: body are known as Sensory
0:4:2: neurons while the neurons that carry the
0:4:5: signals from the brain to all the parts
0:4:7: of the body are called motor
0:4:9: neurons so now you know that the reflex
0:4:12: responses are very quick but it would
0:4:15: take much longer if the information goes
0:4:18: the whole way from the sensory organs to
0:4:20: the brain so the responses to these
0:4:23: reflex actions are given up by the
0:4:25: spinal
0:4:27: cord this shorten nerve pathway the
0:4:29: connection between the sensory nerve and
0:4:31: the motor nerve that controls the reflex
0:4:34: action is known as reflex arc the
0:4:37: nervous system consists of many nerve
0:4:39: cells or
0:4:41: neurons a nerve cell is made up of a
0:4:43: cell body dendrites and an axon the
0:4:47: involuntary instantaneous movements in
0:4:49: response to some external stimuli are
0:4:52: known as reflex
0:4:53: actions we hope that you have understood
0:4:56: the concept of animal nervous system now
0:5:0: here's a secret on how you can study
0:5:2: effectively with the urv app you can
0:5:5: learn with chapter notes watch video
0:5:7: lectures and solve ncer based McQ tests
0:5:11: of this chapter on
0:5:13: urv and that's not all you also get
0:5:16: amazing courses for class 10 and much
0:5:18: more for your class 10
0:5:20: preparation thank you