Plasma membrane, cytoskeleton, centrioles, flagella

Description of plasma membrane

Plasma membrane surrounds all cells and controls what enters and leaves. Membranes are also found inside cells.

Function of plasma membrane

Allows for exchange of substances

What is plasma membrane made from?

Plasma membrane is made from 2 layers of phospholipid molecules plus protein

Description of cytoskeleton

A network of protein fibres in cells.

What do microtubules do?

Support for movement

What does actin do?

More organelles for movement, seen in some WBC

What do intermediate filaments do?

They bear tension, thus maintaining the shape of the cell, and anchor the nucleus and other organelles in place.

Function of cytoskeleton

Provides mechanical strength to the cell. Maintains shape and structure. Holds organelles in place. Aids organelles for molecular transport. Allows for cell movement. Helps with cell division

Description of centrioles

Small tubes of protein fibres. Found next to nucleus in animal cells. 90 degrees to each other

Function of centrioles

Takes part in cell division forming fibres known as the spindle which moves chromosomes apsrt

Description of flagella

Projection from the plasma membrane. Sperm tail

Function of flagella

Involved in locomotion, moves the cell in a direction