AQA A Level Biology: Digestion and Absorption - Part 1 скачать в хорошем качестве

AQA A Level Biology: Digestion and Absorption - Part 1

Unlock full course: https://studymind.co.uk/online-course... Today you’re going to learn about Digestion & Transport from the A-Level Biology AQA Specification and feel confident about exam technique! ✅ Watch all the videos for FREE on https://bit.ly/32OAe7d alongside our textbook and free flashcards. A-Level Biology especially for AQA can be tough but fortunately we’ve made this tutorial to help you score the A* you need for questions on Digestion & Transport. ✅ 📒The three main aims of this tutorial are to cover: 📒 1. Digestion of Carbohydrates, Proteins and Lipids 2. Absorption in the Small Intestine 3. Absorption of Amino Acids Introduction (1:40) The digestive system breaks down food. There is both mechanical and chemical digestion. Mechanical digestion alone is not enough. Chemical digestion involves hydrolysis. Digestion of Carbohydrates (6:59) Carbohydrates are hydrolysed by carbohydrases. Carbohydrate digestion begins in the mouth. Additional digestion of carbohydrates takes place in the duodenum. Disaccharides are broken down into monosaccharides. Defects of these digestive enzymes can lead to dietary issues. Digestion of Proteins (10:05) Protein digestion occurs first in the stomach. Protein digestion occurs second in the small intestine. Proteins are broken down by three major enzymes: endopeptidases, exopeptidases & dipeptidases into single amino acids. These amino acids are reabsorbed into the blood stream by cells of the small intestine and are transported throughout the body to carry out various functions such as synthesising new proteins. Digestion of Lipids (12:55) Before lipids can be hydrolysed, they need to be emulsified. Emulsification happens in the duodenum by bile salts. Lipases catalyse the hydrolysis of lipids. Lipases work in the small intestine. Summary of Digestion (15:05) See table on video. To catch our latest videos, subscribe and leave a comment below on a video you’d like us to record! 👇 Subscribe to Study Mind with ONE CLICK👇 👇Revise with free past papers BY TOPIC for AQA A-Level Biology👇 https://bit.ly/2mE065v 👇Get personalised 1-1 Tutoring at £30ph for GUARANTEED improvement👇 https://bit.ly/2mDXNzn Tags: #AQABiology #ALevelBiology #StudyMind #Digestion #Lipids