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Levels of Organisation

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Paul Sheffield

on 17 September 2014

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Transcript of Levels of Organisation

Levels of Organisation
Levels of organisation

Why are Viruses often described as non-living?
Levels of organisation
Cell Structure
Collective memory

Group the following and explain why
look at the muscle tissue slides
draw a muscle cell under high power
draw muscle tissue under low power

All of the organ systems come together to form an organism.

Organism is the fifth level of organisation.

Just as cells act together in tissues, and tissues act together in organs, organs act together in organ systems.

Organ systems is the fourth level of organisation.

1st Level: Cells working together form
2nd Level: Tissues, which can form
3rd Level: Organs, which work together to form
4th Level: Organ Systems, which work together to form
5th Level: Organisms!

Let’s review:

Organ Systems

When a group of different types of tissues work together, they form and organ.

Organs is the third level of organisation.

In multicellular organisms, cells rarely work alone.

Cells carry out their own “tasks” to ensure that the body as a whole continues to function


What is the body fundamentally made of?

Because we are multicellular organisms it’s very complex.


How many can you write?

Here, several different types of tissues have separate jobs, but they all form one larger structure – an organ.

Tightens and loosens itself to move other body parts

Muscle Tissue

Covers and lines body surfaces, cavities and ducts.

Cells look regular, geometric shaped with obvious nuclei.

Epithelial Tissue

But how do we organise it?

The body is wonderful thing…

Learning Objective:
How are cells organized into tissues, organs, organ systems?

Organisation In The Body

Scientists are learning about how cells work by studying the chemical reactions that go on inside cells. This is the job of biochemists. They study the body at the biochemical level.

There’s also one more level:

Organ system is a group of organs that work together to perform a major function.

Organ Systems

Carries messages -between the brain and the body

Nerve Tissue

Connects and supports other parts of the body.

Blood, bone, fat and cartilage are all examples of connective tissue.

Connective Tissue

There are four basic/major types of tissues in the human body:
Epithelial tissue
Muscle tissue
Connective tissue
Nerve tissue


Cells that are similar in structure and function are usually joined together to form tissues.

Tissues is the second level of organisation.


We can study the body at the cellular level.

Cells is the first level of organisation.

Excretory system


Organ Systems


I= Digestive system

H= Respiratory

Skin and hair

G= Lymph system

Organ Systems

D= Endocrine

C= Nervous system

E= Circulatory system

A and B=
Muscular and Skeletal

Organ Systems
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