Wednesday, 13 February 2013

2.26 describe the structures of the human alimentary canal and describe the functions of the mouth, oesophagus, stomach, small intestine, large intestine and pancreas

The mouth
Mechanical digestion happens here- your jaw action.
A bolus is created; this is a ball of food covered in saliva. This is help full as the food is lubricated to enable swallowing and enzymes in the saliva can begin to break down the food. (amylase)

The oesophagus
this tube connects you mouth and stomach. It is next to the trachea which is covered by the epiglottis when you swallow so the food only enters the oesophagus.
Peristalsis- or muscular contractions- moves the food downward.

The stomach
Churning mechanically digests whilst enzymes do so chemically.
Chyme is the name for liquid food existing in the stomach.

The small intestine
This absorbs digested molecules into the blood stream.
Villi cover the inside giving it a large surface area which many molecules can diffuse through into the blood.

Large intestine
This absorbs water from undigested food, producing faeces.

Pancreas
This produces the enzymes lipase, amylase and protease.
Posted by at
Labels: , ,

15 comments:

  1. William1 June 2014 at 02:17

    Pancreas should be just before small intestine.

    Thanks for all the help!

    ReplyDelete
    Replies
    1. William2 April 2015 at 03:55

      This was me revising for end of year exams last year. It's really weird seeing myself.

      Anyway, you got me an A* back then so let's do it again for the real thing :D

      Delete
    2. HannahHelp3 April 2015 at 15:33

      Oh mate nice! Best of luck :))

      Delete
    3. HannahHelp3 April 2015 at 15:35

      Thanks for all the help from your side, its people like you who keep the blog going even when I have no recolection of GCSE haha. Remeber not to work too hard will!

      Delete
    4. Anonymous13 May 2017 at 03:57

      Now you're probably studying for your A-level exam. I'm only revising for my year 10 IGCSE exams.

      Delete
  2. physics hater15 November 2015 at 11:26

    Thank u so much

    ReplyDelete
  3. Unknown23 December 2015 at 03:14

    It's important to mention that gastric juice in the stomach contains: 1) protease to digest protein and 2) hydrochloric acid which maintains the pH and also kills bacteria.

    ReplyDelete
  4. Ask The Audience30 December 2015 at 12:23

    u the best hannah

    ReplyDelete
  5. Anonymous3 April 2016 at 22:34

    *helpful.

    ReplyDelete
  6. Unknown4 April 2016 at 08:45

    Stomach contains acid which helps digest food and small intestine seceretes enzymes to help digest food as well

    ReplyDelete
  7. theguru8 May 2016 at 08:46

    thanks x

    ReplyDelete
  8. Unknown13 June 2016 at 15:29

    this has helped me so much ! thank you xx

    ReplyDelete
  9. Unknown14 March 2017 at 04:47

    I got DE in my IGCSE science double award... I really want to cry when I got my result. I've study so hard and yet...

    ReplyDelete
  10. Mike Tsang26 June 2017 at 02:41

    The Biology Syllabus has changed.... New Syllabus Blog:

    http://igcse-biology-2017.blogspot.hk

    ReplyDelete
  11. SophieRice26 June 2017 at 07:46

    look at here for more

    http://igcse-biology-notes.blogspot.hk/2017/06/226-describe-structures-of-human.html

    ReplyDelete

Subscribe to: Post Comments (Atom)