Animals and Plants - tissues and organs

Animal and plants are mulicellular meaning they are built of many cells that are organised in our bodies.

• CELL                             - basic building block which can become specialised to          (e.g. : muscle cell)            perform a sepcific function
• TISSUE                          - a group of similiar cells working together
  • (e.g:heart muscle)       
• ORGAN                          - different tisues working together at a specific funtion
  • (e.g: heart)          
• ORGAN SYSTEM           - group of different organs working together at a specific funtion
  • (e.g: circulation)

Examples of animal tissues

• Muscle tissues - able to contract to bring movement
• Glandular tissues - produce subtances such as enzymes and hormons

Digestive System

• Organs work together to form organ systems
• The digestive system has two major functions :
  • Digestion - the break down of food using enzymes released by the glands
  • Absoprtion - where useful molecules are taken from the gut into the blood 

1. What does multicellular mean ?

2.Name three organs in the human digestive system

3.What is the difference between and organ and a tissue

Plants are organised into tissues, organs and organ systems

Organ                       Function

Stem                     Supports the plant

                             Transports molecules throught the plant

Leaf                       Produces food by photosynthesis

Root                      Anchors the plant

                             Takes up water and minerals from the soil 

• Organs of plants are made from tissues:
  • Epidermal Tissues -       form a covering layer over surface of plant
  • Mesophyll tissue layer -inside the leaf, contains cells with chroloplats to carry out                                        photosynthesis
  • Phloem tissue layer -    form long tubes through the lant to transport sugars frim the                                      leaves to other parts of the plant
  • Xylem Tissues -            made of hollow cells with strong cell walls. The cells are                                            stacked one above the other and form a long tube through                                        plant. It is found around the edge of the stem. These cells                                        carry water from the roots to the leaves and help support the                                      plant 

1. Name three tissues of a plant

2. Which tissues are involved in transport in plants ?

3. How is xylem adapted to carry out the funtion of transporting water ?