Turn on thread page Beta
    • Thread Starter
    Offline

    0
    ReputationRep:
    Can anyone explain to me the process of the digestive system please!?!
    Offline

    3
    ReputationRep:
    Ingestion is putting food into your mouth. In your mouth, food is mechanically digested by the chewing movement created by our jaw action. It is also partially digested by saliva as saliva contains amylase, which breaks down starch into maltose. A bolus (ball of food covered in saliva) is created so food is lubricated for easy swallowing. The bolus passes down the oesophagus (the muscular tube connecting the mouth and stomach) into the stomach. In the stomach, the muscular walls of the stomach pummel food (churning) to mechanically digest food. The stomach also produces the protease enzyme, pepsin. The stomach contains hydrochloric acid to kill bacteria and give the optimum pH for pepsin to work at. Food then moves into the small intestine. The pancreas produces pancreatic juice, containing protease, amylase and lipase- it releases this into the small intestine. In the small intestine food is broken down into smaller molecules (Note that amylase converts starch into maltose, maltase converts maltose into glucose, protease converts proteins into amino acids and lipase convert lipids into fatty acids and glycerol), absorbed (Absorption is the process of moving small food molecules into the blood through the walls of the small intestine) and assimilated (Small food molecules are used to build large molecules e.g. amino acids are used to make structures in cells). The large intestine absorbs water from undigested food, producing faeces. Faeces are egested (removed through the anus).

    If you need info on peristalsis, bile or the villi then ask. I am assuming u are doing edexcel
 
 
 

1,451

students online now

800,000+

Exam discussions

Find your exam discussion here

Poll
Should predicted grades be removed from the uni application process
Useful resources

Study tools

Rosette

Essay expert

Learn to write like a pro with our ultimate essay guide.

Thinking about uni already?

Thinking about uni already?

See where you can apply with our uni match tool

Student chat

Ask a question

Chat to other GCSE students and get your study questions answered.

Creating

Make study resources

Create all the resources you need to get the grades.

Planner

Create your own Study Plan

Organise all your homework and exams so you never miss another deadline.

Resources by subject

From flashcards to mind maps; there's everything you need for all of your GCSE subjects.

Papers

Find past papers

100s of GCSE past papers for all your subjects at your fingertips.

Help out other students

Can you help? Study help unanswered threads

Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.