EVS
Write
the following content in your science note book.
The
digestive system
Mouth : The
teeth bite and chew the food.
Saliva in the mouth digests the food .
Oesophagus
: Food goes into stomach through food pipe.
Stomach
: It grinds the food and mixes it further with digestive juices.
Small
intestine : Food is further broken down and absorbed with the help of
intestinal juices.
Absorbed food passes into
the blood.
Large intestine
–Water is absorbed and further the undigested food passes through
the large intestine to
rectum .This undigested food is faecal matter.
Liver secretes bile juice which helps in the digestion of fats.
Gall Bladder stores bile juice.
Pancreas secretes pancreatic juice which helps in digestion and also
secretes insulin which helps in
regulation of sugar level in our body.
Anus- The
faecal matter is expelled out of the body through anus.
Digestive fluid secreted:
Mouth- saliva
Stomach- Hydrochloric
acid
Liver-Bile
Pancreas- Pancreatic
juice
Respiratory system :
We breathe
in through our nose, the hair in our nose clears the air before it enters. A
sticky substance called mucus prevents dust and germs to enter our lungs, so we
should breathe often through our nose.
From the nose air enters the wind pipe(trachea).
It passes through bronchi and enters into the lungs present in our chest.
As we breathe in, lungs expand, their volume
increases and as a result outside air enters our lungs.
Our lungs
contain many blood capillaries and oxygen enters the blood capillaries and gets
dissolved in blood and is taken to different parts of the body.
Carbon-dioxide
is collected from different parts of the body and sent to the lungs.
When we breathe out our lungs contract. When
they contract their volume decreases and as a result carbon-dioxide is released
from the lungs.
Hindi
Write Word – Meanings of Lesson-1 given
on page no. 7 of the textbook in Hindi notebook.
