An introduction to the organ systems of humans for Year 8 science students.

1. FUNCTIONING ORGANISMS.
01. Body systems.
Ian Anderson
Saint Ignatius College Geelong

2. MULTICELLULAR ORGANISMS.
Why do complex multicellular organisms like humans
need organ systems?
Source: http://www.bodymotsystems.com/

3. SINGLE-CELLED ORGANISMS.
 Single-celled organisms
can carry out all their life
processes within the one
cell.
 Organisms are able to
exchange substances
directly with their external
environment.
 Nutrients & oxygen can
be collected from the
surrounding water.
 Wastes can be got rid of
directly into the water.
Source: http://www.microscopy-uk.org.uk/mag/art97b/prointro.html

4. MULTICELLULAR ORGANISMS.
 The cells of multicellular
organisms are not all in
direct contact with their
external environment.
 Not all body cells are
able to exchange
substances with the
external environment.
 They are therefore unable
to obtain their own
nutrients, oxygen & other
substances needed for life
processes, nor get rid of
wastes.
Source: http://www.wrecksite.eu/marine-
species.aspx

5. MULTICELLULAR ORGANISMS.
 In order to obtain
nutrients, oxygen & other
substances and be able
to get rid of wastes the
cells of multicellular
organisms need a
helping hand.
 They need organ
systems which together
work to provide nutrients,
oxygen, get rid of waste
and lots more.
Source: http://cartoons-
picture.blogspot.com.au/2012/12/cartoon-coyote-pictures.html

6. LEVELS OF ORGANISATION.
Cells • form
Tissues • form
Organs • form
Organ
systems
• form
Organism
Source: http://encyclopedia.lubopitko-bg.com/

7. ORGAN SYSTEMS.
What are our main organ
systems?
 Digestive system.
Source: http://www.cakechooser.com/

8. ORGAN SYSTEMS.
What are our main organ
systems?
 Digestive system.
 Circulatory system.
Source: http://www.cakechooser.com/

9. ORGAN SYSTEMS.
What are our main organ
systems?
 Digestive system.
 Circulatory system.
 Respiratory system.
Source: http://www.cakechooser.com/

10. ORGAN SYSTEMS.
What are our main organ
systems?
 Digestive system.
 Circulatory system.
 Respiratory system.
 Excretory system.
Source: http://www.cakechooser.com/

11. ORGAN SYSTEMS.
What are our main organ
systems?
 Digestive system.
 Circulatory system.
 Respiratory system.
 Excretory system.
 Reproductive system.
Source: http://www.cakechooser.com/

12. ORGAN SYSTEMS.
What are our main organ
systems?
 Digestive system.
 Circulatory system.
 Respiratory system.
 Excretory system.
 Reproductive system.
 Nervous system.
Source: http://www.cakechooser.com/

13. ORGAN SYSTEMS.
What are our main organ
systems?
 Digestive system.
 Circulatory system.
 Respiratory system.
 Excretory system.
 Reproductive system.
 Nervous system.
 Muscular system.
Source: http://www.cakechooser.com/

14. ORGAN SYSTEMS.
What are our main organ
systems?
 Digestive system.
 Circulatory system.
 Respiratory system.
 Excretory system.
 Reproductive system.
 Nervous system.
 Muscular system.
 Skeletal system.
Source: http://www.cakechooser.com/

15. BIBLIOGRAPHY.
Cash, S., Quinton, G., Tilley, C., & Craven, E. (2013).
Oxford Big Ideas. Science 8: Australian
Curriculum. Melbourne: Oxford University Press.

16. http://sickscience8.wikispaces.com/