Yr8 - specialised cells

Dr Pusey

www.puseyscience.com

Q: What do you think “Specialised” means?

You are here:

Organism(e.g. Human)

Systems(e.g. Nervous System)

Organs(e.g. Skin)

Tissue(e.g. Nerve)

Cells(e.g. Neuron)

Q: What does specialised mean??

A: Something that is designed to do a particular job

Specialised Cells

Q: What is a specialised cell?

A: A cell that has a special shape and features that help it to do it’s job

Structure:

Big surface area

Contains haemoglobin which pick up oxygen

Function:

Carry oxygen around the body

Red Blood Cells

Structure:

Found in leaves and stems of plants

Function:

Work in pairs

Control what goes in and out of leaves (water, gas, etc)

Guard Cells

Structure:

Long

Can carry electrical impulses

Connections at each end

Function:

Carry nerve impulses around your body

Nerve Cells

Structure:

Long tail for swimming

Enzymes in the head to get into the egg

Function:

To carry genetic information to the egg

Sperm Cell

Structure:

Large surface area

Thin cell wall

Function:

Absorbs minerals and water from soil

Root Hair Cells

Structure:

Contains yolk

Function:

Provides a large food store for the new cell being formed.

Cytoplasm containing yolk

Layer of jelly

Nucleus

Egg Cell

Smallest Building Block of Life

As you can see, the cell builds anything and everything in life

From this point on in Year 8, we’ll be looking at the Human Body

2. Tissue Cells specialise to do a certain job

(e.g. muscle cell)

These specialised cells join together to make a tissue (e.g. muscle tissue)

There are four main types of tissue

Each type does a different job

Organism(e.g. Human)

Systems(e.g. Nervous System)

Organs(e.g. Skin)

Tissue(e.g. Nerve)

Cells(e.g. Neuron)

Muscle tissue, found in the heart

Organs When a group of tissues work together they form

an organ

Q: Can you label these organs?

Organism(e.g. Human)

Systems(e.g. Nervous System)

Organs(e.g. Skin)

Tissue(e.g. Nerve)

Cells(e.g. Neuron)

Organ Systems Groups of organs work together in

organ systems

These systems provide a specific service for our bodies.

For example, the nervous system carries impulses throughout the body so that we humans can sense our surroundings, and send signals to other organs like our muscles!

Organism(e.g. Human)

Systems(e.g. Nervous System)

Organs(e.g. Skin)

Tissue(e.g. Nerve)

Cells(e.g. Neuron)

Organisms Different organ systems work together to

make an organism

Organisms can have similar or different systems, depending on how they live their daily life!

Organism(e.g. Human)

Systems(e.g. Nervous System)

Organs(e.g. Skin)

Tissue(e.g. Nerve)

Cells(e.g. Neuron)