3. Cells, tissues, organs,
systems…
The cell is the smallest living unit of a
human body.
◦ When a group of cells join, they form a
tissue.
When a group of tissues join, they form
an organ.
When a group of organs join, they form
a system.
All the cells, tissues, organs or systems that join
perfom the same work so they do it together.
4.
5. Basic human processes
As all the living things in the
world, humans also perform
the three basic life
processes:
◦ Nutrition
◦ Interaction
◦ ReproductionUSEFUL LINKS:
http://www.primaria.librosvivos.net/archivosCMS/3/3/16/us
uarios/103294/9/5EP_Cono_ud1_in_184_1/frame_prim.s
wf
http://www.bbc.co.uk/bitesize/ks3/science/organisms_beh
aviour_health/cells_systems/activity/
6. In the first unit we are going to talk
about NUTRITION and the human
systems that perform this process.
DIGESTIVE SYSTEM
RESPIRATORY SYSTEM
CIRCULATORY SYSTEM
EXCRETORY SYSTEM
7. NUTRITION
Nutrition is the process that allows
humans to take the energy they need
from food.
But… nutrition doesn’t mean only
EATING, it also means BREATHING
from the air, EXPELLING what we
don’t need and moving the BLOOD all
around the body.
10. DIGESTIVE SYSTEM:
Function
The Digestive System breaks down
food into nutrients.
The Disgestive System absorbs the
nutrients.
The Digestive System eliminates the
waste.
11. DIGESTIVE SYSTEM:
How it works?
The Digestive System works on three
different processes:
◦ Digestion
◦ Absorption
◦ Elimination
12. DIGESTION
The food arrives to your mouth.
The salivary glands produce the saliva, and
the tongue mixes everything, creating the
BOLUS.
The bolus goes through the esophagus.
In the stomach, the bolus is mixed with the
gastric juices, creating the CHYME.
The chyme goes to your small intestine.
13. ABSORPTION
In the small intestine the chyme mixes
with some intestinal juices and the
bilis and makes the CHYLE.
The small intestine absorbs the
nutrients you need to live and the rest
goes to your large intestine.
14. In the large intestine, water from the
CHYLE is absorbed.
The CHYLE is transformed into
FECES. They go to the rectum and
are expulsed by the anus.
ELIMINATION
Follow these links to see the process again:
https://www.youtube.com/watch?v=yB86O2giBu8&index=1&list=PLc-
Q5I46mTBx3OX-iedRKwsa1Eivg-26P
http://kitses.com/animation/swfs/digestion.swf
16. 2. They are the first
tubes inside the
lungs
3. They are at the
beginning of the
Respiratory System
5. It connects the
Nassal Passages to
the Pharynx
6. They are the
biggest and main
part of the
Respiratory System
1. It is also called
windpipe
4. It is the tube
before the trachea
17. RESPIRATORY SYSTEM:
Function
The Respiratory System extracts oxygen
from the air and eliminates the Carbon
Dioxide (CO2) that your cells produce.
It exchanges oxygen and carbon dioxide
between the lungs and the blood.
It exchanges oxygen and carbon dioxide
between the blood and your body cells.
19. The air enters by the nasal passages
and goes to the pharynx through the
trachea. This air is mainly oxygen.
The oxygen arrives to the lungs,
bronchi and bronchiole.
When the oxygen arrives to the alveoli
it passes to the blood.
INHALATION
20. The carbon dioxide (from the cells)
comes back to the alveoli.
The carbon dioxide goes to the
trachea and then to the nasal
passages.
Finally the carbon dioxide is sent to
the external air.
EXHALATION
