This is a legacy topic. View the most up to date content by selecting the exam board in the dropdown to the left.
Unlike diffusion, osmosis and facilitated diffusion, active transport requires energy in the form of ATP (adenosine triphosphate), and moves substances against a concentration gradient (from a lower concentration to a higher concentration). This process is essential in removing of all toxins from the body, as well as the movement of rare chemicals.
Active transport is achieved by specific carrier proteins in the plasma membrane, and relies on adequate oxygen supply (which results in ATP being available). Here’s a quick video that shows the process:
There are certain cells which carry our active transport more than others, for example in the kidney. These cells have special adaptations, such as microvilli for increased surface area, hence more carrier proteins available, as well as many mitochondria for the production of ATP.
I bookmarked the site
translucent The Student Room
Thank you for making all the content btw!
Serena Kutty YouTube
Just a huge thank you for spending your time helping others. I love your site and I'm seriously very grateful. No word of a lie
Neuron13 The Student Room
Thank you!! Your site is so helpful!
Hi! I have recently finished my first year doing biology at uni and I subscribed to you back when I was doing AQA A levels (glad I don’t live in Wales after watching this vid lol) and you and your website helped me so much. Just wanted to say it’s so nice to see you
Mr Peanutbutter YouTube