Brief explaination of the human digestive system

1. Transport System
in mammals
(Humans)
Compiled by Ms S Nkwanyana

2. Learning
outcomes
• For this lesson

3. Roll up your sleeves, let the show
begin!!!
OK, LISTEN PROPERLY!!!

4. Open Circulatory system
spot any similarities?
Pool with a pool pump

5. Open circulatory system
• Blood vessels lead into a cavity, which leads to a network of interior
channels and spaces
• Blood moves freely inside the body cavity in all directions.
• Arthropods are group of animals consisting mostly of insects that
have an open circulatory system

6. Examples of animals with
an open circulatory system
• Grasshoppers
• Snails
• Spiders

7. Closed Circulatory System
Any similarities?
A parallel circuit

8. Closed Circulatory system
• Blood vessels lead from one type of vessel to another, not into a body
cavity
• Blood flows in one direction, continuously.
• Vertebrates have a closed circulatory system

9. Examples of animals
with a closed
circulatory system
• Humans
• Cats
• Dogs
• Dolphins
• Fishes

10. Cardiovascular
circulatory
systems
• https://youtu.be/LlTzdGw
2ouI

11. Cardiovascular
circulatory
systems
• Cardiovascular circulatory
stems in vertebrates show
a single or a double
circulation pathway

12. Cardiovascular circulatory systems
• Single circulatory pathways
• A fish has a venous heart, which means it receives only deoxygenated (oxygen-poor) blood.
• The heart pumps the blood to the gills to get oxygen and from there the blood is pumped to the rest of the body.
• The blood passes only once through the heart, so we say that fish have a single circulation.
• Double circulation pathways
• Amphibians, some reptiles, birds and mammals have an arteriovenous heart, which means it has arteries and veins.
• Arteries carry oxygenated blood and veins carry deoxygenated blood. Both are connected to the heart.
• The blood goes twice to the heart and is pumped out twice, which is why it is called
• a double circulation pathway.
• The first time it is pumped to the lungs (pulmonary circulation) and the second time to the rest of the body (systemic circulation

13. Lets change the pace a bit…

14. Lets play a little game!
How to play:
In groups of 6, choose one member to ask
you questions.
The questioner will read the cue-cards, and
the remaining members have to guess the
correct answer to the statement read.
You’ll have 30 seconds to go through the cue-
cards as quickly as possible.
As a group, if you don’t know, shout PASS
and the next statement will be read.
The group with the most questions answered
in 30 seconds, WINS!!!

15. Till next time…