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active transport class 9 biology
active transport in urdu
biology class 9 chapter 4 active transport
active transport
active transport biology
active transport class 9th
active transport across cell membrane
active transport and passive transport
9th class biology chapter 4 active transport
what is active transport in biology
active transport in hindi
class 9 biology chapter 4 active transport
9 class biology chapter 4 active transport
#9thclassbiology
#class9biology
#eLearning pk
#Pk stories
#Learn with dyed atif
#Sreducators
#Sair medical learning
#Nextgene developer
#impulse wave
#TWC academy
#Study malaria
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LearningTranscript
00:00Assalam-o-Alaikum, today our topic of discussion is Epi-Transport.
00:07So, we had studied about passive transport in previous lecture.
00:13In passive transport, molecules move from higher concentration to lower concentration.
00:22And they do not use energy in this moment, whereas active transport is opposite of passive
00:29transport.
00:30So, in passive transport, molecules move from higher concentration to lower concentration.
00:37And they do not use energy in this moment, whereas active transport is opposite of passive
00:44transport.
00:46Whereas, active transport is opposite of passive transport.
00:50In active transport, molecules move from lower concentration to higher concentration.
00:58And they do not use energy in this moment.
01:02As we had studied about nerve cells, what do nerve cells do?
01:09They send messages to the brain.
01:12For example, when we touch something hot, we remove our hand immediately.
01:18How do we know that this thing is hot?
01:21So, our hands send messages to the brain through nerve cells.
01:27And the brain tells us that this thing is hot, so remove your hand.
01:32Similarly, when we touch something cold, we know that this thing is cold.
01:37Similarly, when we touch something soft, we know that this thing is soft.
01:43How do we know all this?
01:45Our whole body has nerve impulses, which send messages to the brain.
01:52So, nerve impulses do not always send messages to the brain.
01:58Whenever we touch something, they send messages to the brain.
02:04So, when nerve impulses are not passing, this condition is called nerve impulse resting state.
02:12So, when nerve cells are in resting state, they prefer to have as much potassium as possible in the nerve cells.
02:28In resting state, more and more potassium is present in the nerve cells.
02:34For example, the outermost covering of the cell is called the cell membrane.
02:42It is semipermeable.
02:44We have studied the structure of the cell membrane in detail in Fluid Mosaic Model.
02:49It has two layers of lipids.
02:52In addition to this, proteins are also attached to it.
02:55We have studied this in detail.
02:57So, this is a cell membrane of the nerve cell.
03:02It is semipermeable.
03:06Since it is in resting state, this is the inner part of the cell.
03:11And this is the outer part of the cell.
03:17As you can see, there is more potassium in the inner part of the cell as compared to the outer part of the cell.
03:24There is less potassium in the outer part of the cell and there is more potassium in the inner part of the cell.
03:30So, molecules always move from high concentration to low concentration.
03:36But in resting state, they want more potassium in the inner part of the cell.
03:43So, how does the cell membrane bring potassium inside?
03:48By using energy.
03:51It has to use energy.
03:54So, we have a sodium-potassium pump.
03:58It is made of protein.
04:01It uses energy.
04:04And energy is stored in the form of ATP in the cell.
04:10So, it uses energy.
04:13And this sodium-potassium pump brings more potassium inside.
04:23Since it has moved from lower concentration to higher concentration.
04:28So, it has to use energy.
04:33As you can see, there is less potassium in the inner part of the cell and there is more potassium in the outer part of the cell.
04:40So, this sodium-potassium pump brings more potassium inside.
04:45And for this, it uses energy in the form of ATP.
04:50This is called ectotransport.
04:53That is, molecules move from lower concentration to higher concentration by using energy.
05:00This is called ectotransport.
05:03That is, molecules move from lower concentration to higher concentration by using energy.