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Natural sciences

Grade 4

Life and way of living

Module 17

The digestive system

Learn about the digestive system and to name a few important organs in the system

Let us look at how the digestive system works: Your body needs food to grow and to remain healthy. A long canal runs from your mouth, right through the body to the opening where the food (residue) leaves the body again. The upper part of this canal is fairly straight, but the lower part is convoluted. Several things happen to the food while it travels along this canal.

When you chew your food, your teeth and tongue grind it and the saliva helps you to swallow it.

The food gets pushed through the oesophagus to the stomach. Muscles in the walls of the oesophagus contract automatically to do this. We speak of the peristaltic action of the oesophagus.

In the stomach, the food is mixed, ground and stirred by the muscles of the stomach wall.

Nutrients are removed from the food in the small intestine and are transported to other parts of the body by the blood.

What is left of the food goes through the large intestine, where water is mainly taken up, before the residue that is not needed leaves the body when the bowels are emptied.

Complete the illustration by filling in the captions.

Write a proper sentence to explain why babies are able to live on milk alone.

Memorandum

  1. mouth
  2. oesophagus
  3. stomach
  4. small intestine

5. large intestine

Questions & Answers

what is mutation
Janga Reply
what is a cell
Sifune Reply
how is urine form
Sifune
what is antagonism?
mahase Reply
classification of plants, gymnosperm features.
Linsy Reply
what is the features of gymnosperm
Linsy
how many types of solid did we have
Samuel Reply
what is an ionic bond
Samuel
What is Atoms
Daprince Reply
what is fallopian tube
Merolyn
what is bladder
Merolyn
what's bulbourethral gland
Eduek Reply
urine is formed in the nephron of the renal medulla in the kidney. It starts from filtration, then selective reabsorption and finally secretion
onuoha Reply
State the evolution relation and relevance between endoplasmic reticulum and cytoskeleton as it relates to cell.
Jeremiah
what is heart
Konadu Reply
how is urine formed in human
Konadu
how is urine formed in human
Rahma
what is the diference between a cavity and a canal
Pelagie Reply
what is the causative agent of malaria
Diamond
malaria is caused by an insect called mosquito.
Naomi
Malaria is cause by female anopheles mosquito
Isaac
Malaria is caused by plasmodium Female anopheles mosquitoe is d carrier
Olalekan
a canal is more needed in a root but a cavity is a bad effect
Commander
what are pathogens
Don Reply
In biology, a pathogen (Greek: πάθος pathos "suffering", "passion" and -γενής -genēs "producer of") in the oldest and broadest sense, is anything that can produce disease. A pathogen may also be referred to as an infectious agent, or simply a germ. The term pathogen came into use in the 1880s.[1][2
Zainab
A virus
Commander
Definition of respiration
Muhsin Reply
respiration is the process in which we breath in oxygen and breath out carbon dioxide
Achor
how are lungs work
Commander
where does digestion begins
Achiri Reply
in the mouth
EZEKIEL
what are the functions of follicle stimulating harmones?
Rashima Reply
stimulates the follicle to release the mature ovum into the oviduct
Davonte
what are the functions of Endocrine and pituitary gland
Chinaza
endocrine secrete hormone and regulate body process
Achor
while pituitary gland is an example of endocrine system and it's found in the Brain
Achor
what's biology?
Egbodo Reply
Biology is the study of living organisms, divided into many specialized field that cover their morphology, physiology,anatomy, behaviour,origin and distribution.
Lisah
biology is the study of life.
Alfreda
Biology is the study of how living organisms live and survive in a specific environment
Sifune
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Source:  OpenStax, Natural sciences grade 4. OpenStax CNX. Sep 18, 2009 Download for free at http://cnx.org/content/col11096/1.1
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