Yr 11 - SCB - Absorption, Assimilation & Egestion (biology)

Question 1

Define absorption

Answer 1

the process by which the nutrients of food move from the small intestine into the bloodstream

Question 2

Purpose of absorption

Answer 2

To absorb the nutrients in food

Question 3

what structure are involved in absorption

Answer 3

The small intestine is where food is absorbed. It is lined with villi and they are lined with micro villi. Nutrients are absorbed through diffusion.

Question 4

What are the villi adaptations

Answer 4

• large blood supply
• thin epithelium wall and thin capillary walls which increases speed of diffusion
• blood has low concentration of nutrients which increases the speed of diffusion
• villi also have micro villi

Question 5

Define assimilation

Answer 5

is the movement of digested food molecules into the cells of the body.

Question 6

Define egestion

Answer 6

the process of removing un digested food from the body

Question 7

What is the purpose of egestion

Answer 7

to absorb the water used up during digestion back into the body in the large intestine. the remnants are stored in the rectum until released.