Mechanisms of Absorption (AQA A-Level Biology): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
ShowHide
Practise the questions
10 questions from this quiz
What are villi in the ileum?
What are villi in the ileum?
Finger-like projections on intestine
Where are microvilli located?
Where are microvilli located?
On epithelial cell surface membranes
By how much can villi and microvilli increase small intestine surface area?
By how much can villi and microvilli increase small intestine surface area?
Up to 600 times
What is a lacteal?
What is a lacteal?
A lymphatic capillary in each villus
Where do amino acids pass after absorption into epithelial cells?
Where do amino acids pass after absorption into epithelial cells?
Blood capillaries within the villi
What components form micelles?
What components form micelles?
Monoglycerides, fatty acids, bile salts
What is the approximate diameter of micelles?
What is the approximate diameter of micelles?
4-7 nm
Where do monoglycerides and fatty acids recombine to form triglycerides?
Where do monoglycerides and fatty acids recombine to form triglycerides?
Endoplasmic reticulum
Where are chylomicrons released into after exocytosis?
Where are chylomicrons released into after exocytosis?
Lacteals
What structure do bile salt molecules have?
What structure do bile salt molecules have?
Lipophilic and hydrophilic ends