Intro to Cells, Tissues

What can 3D shapes represent in histology diagrams

Tubes/spheres

Can be different sizes depending on how far from the equator of tubes/spheres the diagram is

What does a smear show

Whole cells

What does section show in histology

Thin slice of the specimen

What does the ground disc show in histology

Thick slice of the specimen

How is Haematoxylin and Eosin used in staining

Haematoxylin stains acidic things blue- nuclei is stained blue

Eosin stains everything else pink

What is not stained in the staining process

Watery extra-cellular jelly- does not mean there is any empty space

What does PAS stain

Sugars

What does Van Gieson stain

Elastic fibres

What does trichrome stain

Stains 3 types of cells

Helps differentiate various tissue components

What does Alician Blue stain

Stains mucins blue

Why are cells different in shape

Function dictates form- the shape of cells helps the cell carry out its role/function

What is the shape of rounded cells

Round

What is the shape of polygonal cells

Flat geometric shape with straight sides connected end to end to form a loop

What is the shape of fusiform cells

Elongates ovals/spindles

What is the shape of squamous cells

Flattened cells

What is the shape of cuboidal cells

Squares in shape

What is the shape of columnar shape

They are taller than they are wide

Why are metabolically active cells larger

Have a larger nucleus because there is a high demand for protein synthesis.

Need rRNA which is produced in the nucleolus which is in the nucleus