Cell Diversity Cells are not identical – they diversify their structure to suit their function

Lesson Objectives By the end of this lesson you should be able to: Name 3 types of cells? Define a tissue? Recall 2 types of animal tissue? Recall 2 types of plant tissue? Define a Tissue Culture? Understand the conditions cells in tissue culture need to grow Name two uses for tissue culture?

Types of Cells Nerve Cells Red Blood Cells Muscle Cells

Tissues A Tissue is a group of similar cells that are adapted to carry out the same function

Plant tissues Dermal tissue - A single layer of cells that surrounds the different parts of a plant - Epidermis protects the plant Vascular Tissue - Transports materials around the plant - Xylem transports water and minerals around the plant Phloem transports food from the leaves to the other parts of the plant

Animal Tissues Muscle Tissue can contract Nervous Tissue composed of nerve cells called neurons

Tissue Culture Tissue culture is the growth of tissues in or on an artificial medium outside an organism The tissue sample is removed from a plant or animal and grown in glassware ( in vitro) or in a bioreactor under carefully controlled conditions Growth is by mitosis and produces a cluster of identical offspring - a clone

Conditions necessary for Tissue growth Oxygen Nutrients Growth factors and hormones Correct pH Optimum temperature Sterile conditions Freedom from competition

Applications of tissue cultures Skin grafts Can be used to grow new skin for patients who have been burned Stem cells are used Micro propagation of plants Produces exact copies Quickly produces mature plants Doesn’t need pollinators or seeds Producing plants that are disease resistant and virus free

What have you learned? Can you…. Name 3 types of cells? Define a tissue? Recall 2 types of animal tissue? Recall 2 types of plant tissue? Define a Tissue Culture? Understand the conditions cells in tissue culture need to grow Name two uses for tissue culture?

Lesson Objectives By the end of this lesson you should be able to: Define an organ? Name 2 plant organs? Name 2 animal organs? Define an organ system? Recall 2 animal organ systems?

Organs An organ is a structure composed of a number of tissues that work together to carry out one or more functions Examples  Root- Heart  Stem- Stomach  Leaf- Intestine  Flower- Liver  Seeds- Lungs  Fruit- Skin

Systems A system consists of a number of organs working together to carry out one or more functions Animal Systems Digestive Circulatory Nervous Urinary Endocrine Skeletal Muscular Reproductive

What have you learned? Can you…. Define an organ? Name 2 plant organs? Name 2 animal organs? Define an organ system? Recall 2 animal organ systems?