Cell diversity

What is meant by tissue?

• A tissue is a group of similar cells that carry out the same Functions

Dermal tissue (Epidermis)

Location: Found covering leaves stems and roots

Function: Protect the plants

Adaption: Have a thickened cell wall

Vascular tissue

Function of Xylem:

• Transports water and minerals through the plant

• Provide support

Function of phloem:

• Transfer food from the leaf to other parts of the plant such as a the root

• adaption: Contains a companion cell which contains many mitochondria (Provide energy for transporting food-Sugars)

Nervous tissue

• Compose of nerve cells called neurons

• Function: Neuron’s carry electrical impulses to and from brain and spinal cord

• Adaption: Myelin sheath Helps insulate the movement of the electrical impulse

Muscle tissue

Function: Allows movement by contracting and relaxing

Adaption: By their cells having large amounts of mitochondria To provide the necessary energy required

Example: Skeletal muscle(Biceps/Triceps)

What is meant by tissue culture?

• Tissue culture is a growth of cells an sterile nutrient medium outside and organism

Note: Sterile refers to an environment free of microorganisms

Note: A nutrient medium provides food, allowing the cells to grow

In vitro growth

• Growth of cells outside the body in an artificial Environment

Vivo growth

• growth of cells inside the body

Factors that allow successful tissue culture

• Correct nutrients(Glucose)

• Vitamins and minerals

• Oxygen supply

• Suitable temperature\ PH

• Sterile environment

• Hormones\ Growth regulators

Facts on skin graphs

• Used to grow new skin for a bad skin burns

Benefits of skin grafts

• New skin will not be rejected by persons body as it is identical to patient skin

• A skin can be grown there is no need to remove it from other parts of body