Hair Structure

Hair Structure

Anagen is...

1. Resting Phase
2. Growing and resting Phase
3. Active Growing Phase
4. Changing Phase

Catagen is...

1. Resting Phase
2. Growing and resting Phase
3. Active Phase
4. Changing Phase

Telogen is...

1. Growing and resting Phase
2. Active Phase
3. Changing Stage
4. Resting Phase

What term describes a molecule that avoids water?

1. Hydrophilic
2. Soluble
3. Polar
4. Hydrophobic

Which type of molecule is repelled by water?

1. Hydrophobic
2. Hydrocarbon
3. Hydrogen
4. Hydrophilic

Cuticle 

• Is made up of transparent overlapping scales 
• Heat/ chemicals will open the cuticles 
• The cuticle scales should ideally be closed from root to tip to give the hair shine and lustre 
• Healthy hair reflects light 
• Damaged cuticle scales will make the hair feel porous and appear dull
• When the hair is in good condition they are water repellent and when in poor condition they will allow more water to be absorbed into the hair making it more porous. 

What happens when the cuticle scales are damaged?

1. Hair loses color
2. Hair feels porous and appears dull
3. Hair grows faster
4. Hair becomes thicker

What can open the cuticles?

1. Water
2. Sunlight
3. Heat/chemicals
4. Brushing

What is the cuticle made up of?

1. Transparent overlapping scales
2. Sebaceous glands
3. Protein fibers
4. Melanin pigment

Cortex 

• This is the section under the cuticle and is where most the action happens.  
• Your natural colour is determined in the cortex and this is where artificial colouring mostly takes place.
• It is this layer that has the bonds which hold your hair in place to determine if your hair is straight, wavy, curly or very curly. 
• Where the hair is temporarily or chemically changed from straight to curly or curly to straight. 
• It is the main part of the hair that gives it's strength and elasticity.  

Which part of the hair is responsible for its strength and elasticity?

1. Cuticle
2. Epidermis
3. Medulla
4. Cortex

Which layer of the hair holds the bonds to determine its texture?

1. Epidermis
2. Medulla
3. Cortex
4. Cuticle

Which layer of the hair is responsible for determining your natural color?

1. Medulla
2. Epidermis
3. Cuticle
4. Cortex

Medulla  

• The medulla is the least interesting layer. 
• it is the central part of the hair but is not always present. 
•  In a single strand it may fade in and out when analysed under a microscope  or it may be present all the way through in some hair types.
• it tends to appear in more thicker or coarser hair textures. 

In which hair types is the medulla more likely to be present all the way through?

1. Blonde or brunette hair types
2. Thicker or coarser hair types
3. Curly or wavy hair types
4. Thin or fine hair types