Quick Revision: Digestive System Video Lecture | Science for Class 4

0:0:0: hey everyone today we're going on an
0:0:3: exciting journey through our digestive
0:0:6: system in this video we will learn about
0:0:9: our body's digestive system and discuss
0:0:11: our
0:0:12: teeth imagine eating your favorite
0:0:16: sandwich did you know as soon as you
0:0:19: take that first bite your food begins a
0:0:21: fascinating Journey inside you this
0:0:24: whole process of digestion from start to
0:0:27: finish takes about 3 to 4 hours
0:0:30: let's dive in and see what
0:0:34: happens our digestive system is made up
0:0:37: of several important parts the mouth
0:0:40: food pipe stomach liver pancreas small
0:0:44: intestine large intestine and finally
0:0:47: the Anis each of these organs plays a
0:0:50: crucial role in breaking down the food
0:0:52: we eat ready to find out how let's go
0:0:58: first up is the mouth
0:1:0: yeah our teeth work like little Grinders
0:1:3: breaking the food into smaller pieces
0:1:6: meanwhile saliva a special liquid in our
0:1:9: mouth makes the food soft and even turns
0:1:12: it a bit sweet by converting starch into
0:1:15: sugar it's like
0:1:18: magic next the food travels down the
0:1:21: food pipe or the esophagus as it's
0:1:24: scientifically called this tube is like
0:1:27: a slide that takes the food right into
0:1:29: our St stomach fun isn't
0:1:34: it once in the stomach our food enters a
0:1:37: bad-like structure where it gets mixed
0:1:40: and churned into a paste this paste is
0:1:43: mixed with digestive juices making sure
0:1:46: everything is well
0:1:49: Blended moving on the partly digested
0:1:52: food then enters the small
0:1:54: intestine yeah it gets an extra dose of
0:1:57: digestive
0:1:58: juices then something amazing happens
0:2:1: the nutrients from the food are absorbed
0:2:4: into our blood and delivered to
0:2:5: different parts of our body it's like
0:2:8: our food going on its own little
0:2:11: Adventure what's left of our food the
0:2:13: part that our body doesn't need moves
0:2:16: into the large
0:2:17: intestine here most of the water gets
0:2:20: absorbed back into the body and we are
0:2:22: left with the undigested
0:2:26: food and finally the journey ends as the
0:2:29: undigested food is thrown out of our
0:2:31: body through an opening called the Anis
0:2:34: it's how our body gets rid of what it
0:2:36: doesn't need now let's take a moment to
0:2:40: appreciate our teeth the heroes of our
0:2:42: digestive Journey did you know when the
0:2:46: baby is about 6 months old the teeth
0:2:49: start appearing by the time the baby is
0:2:52: about 3 years old they have 20 teeth
0:2:55: these teeth are called milk teeth at the
0:2:59: age of six the milk teeth start falling
0:3:1: out new teeth appear in their place
0:3:5: these are called permanent
0:3:9: teeth the part of the tooth we can see
0:3:11: is called the crown the part we cannot
0:3:14: see is called the root it holds the
0:3:17: tooth firmly in place the outer part of
0:3:21: each tooth is made of enamel that is
0:3:23: very hard and shiny
0:3:25: substance it protects the inside parts
0:3:27: of the
0:3:28: tooth
0:3:31: enamel is the hardest substance in the
0:3:33: human body dentine lies under the enamel
0:3:38: it is hard but not as much as the enamel
0:3:41: dentine protects the innermost part of
0:3:43: the tooth called the pulk it is soft and
0:3:47: contains nerve endings and blood
0:3:51: supply the nerve endings inside the
0:3:53: pulps send messages to the brain about
0:3:55: any
0:3:56: sensation the nerves are connected to
0:3:59: the gum through a hole in the root gums
0:4:2: are the pink colored soft tissue
0:4:3: surrounding the
0:4:6: teeth in our mouths we have different
0:4:9: types of teeth each with its own jaw
0:4:12: there are incisors canines premolar and
0:4:16: MERS together they help us bite tear and
0:4:20: grind our
0:4:22: food taking care of our teeth is very
0:4:26: important brushing teeth with a
0:4:28: toothpaste twice a day day it is also
0:4:31: good to clean between the teeth with
0:4:33: dental floss which is a special string
0:4:35: for cleaning teeth to remove food
0:4:38: particles it is also important to visit
0:4:40: the dentist
0:4:41: regularly we can also prevent tooth
0:4:44: decay by not eating many sugary snacks
0:4:46: and drinks calcium in milk keeps our
0:4:49: teeth strong vitamin C keeps our gums
0:4:53: healthy the best way to brush teeth is
0:4:56: in little circles until we have covered
0:4:58: surface of every
0:5:0: tooth brush up and down rather than side
0:5:3: to side and that's it folks
0:5:8: conclusion we were able to learn how our
0:5:10: food is digested in our body our teeth
0:5:14: play a big role in our digestive system
0:5:17: they help us to properly digest food
0:5:21: hence we should take care of them we
0:5:23: hope that you have understood the topic
0:5:26: you can now study chapter notes watch
0:5:28: video lecture and solve McQ tests of
0:5:31: this chapter on uff to ensure you score
0:5:34: well in your school
0:5:36: exams and that's not all you also get
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0:5:45: thank you