Sebenarnya, dua hari lagi aku ada test Biology. Tapi aku rasa macam malas gila nak study. Aish! Masalah betul aku ni ! Walaupun malas, aku merajinkan diri untuk cari images yang mudah untuk aku faham anda aku still dapat study walaupun malas tahap maksima! Mudah-mudahan post kali ni dapat membantu sesiapa yang malas macam aku ni. Opss! Hehe.
Passive Transport
Passive transport does not require energy ( in the form of ATP ) from the cell !
The examples of passive transport includes the simple diffusion, osmosis and facilitated diffusion.
In passive transport process, the molecule move from high concentration to lower concentration through protein channel.
Lets look at the picture below !
The movement of the particle need protein channel to pass through.
Lets see another picture :)
The molecules move from a region at high concentration to the region at lower concentration through protein channel. There no energy is needed.
The first example of pasive transport is simple diffusion. Remember that?
Simple diffusion.
Diffusion is the net movement of solutes ( molecules, ions, or atoms ) from a region of higher concentration to a region at lower concentration or down the concentration gradient.
Lets see together :)
This process occur until there is no concentration gradient or its reached dynamic equilibrium.
IMPORTANT DEFINITION
Diffusion : Movement of particle from higher concentration to the lower concentration.
Dynamic Equilibrium : The particle continuously move but there is equal concentration on both sibe of the membrane.
The rate of diffusion depends on :
Its clear? But I think so. :)
Facilitated diffusion.
Facilitated diffusion is the net movement of solutes across a membrane with the help of transport protein.
This process follows the concentration gradient and no energy is needed.
Two types of transport protein are involved in facilitated diffusion, that is :
- Carrier protein - bind to the molecule they want to transport and then they change shape, releasing the diffusing molecules at the other side of the membrane.
- Protein channels - have a central pore that is lined with charged group. The diffusion of charged particles such as ions is helped by these ions channels.
Water diffuse from a region of high water potential to a region of lower potential.
Osmosis process is for water only !
Plasmolysis is a process whereby water leaves the plant cell by osmosis causing the plasma membrane to pull away from the cell wall.
If the plant cell is put into a strong salt solution, plasmolysis will occur.
Lets see the picture :)
The effect of different solutions on animal and plant cells.
Active transport.
Active transport is a process by which cells move molecules across a living membrane from an area of low concentration to an area of high concentration.
Its involved the use of energy in the form of ATP in the cell.
This process also involved carrier proteins in membrane.
The process of active transport.
Okey, now lets play this video ! Have fun ! This video will teach you about active transport :)
Maklumat tambahan korang boleh cari sendiri kat sini. A very good website.
Sampai kat sini je la ye. Papai :)
p/s : moga moga rakan rakan seperjuangan dapat buat yang terbaik. InsyaAllah, mudah mudahan :)
