Tissues
A tissue are cells that have similar structure and function.
There are 4 types of tissues:
Connective tissue
Epithelial tissue
Muscular tissue
Nervous tissue
Epithelial tissue:
Covering/ lining tissue
Skin is a epithelial tissue, it also covers the heart, kidneys, intestines, liver and lungs
Lines the organs (hollow) - heart, intestines and stomach
Simple squamous (flat)
Inside of your gum - thin, flat epithelial cells - close together + form smooth surface
Connective tissue:
Binds + supports other tissues
Cells are not close together - separated by large amounts of material that are not cells this is called a matrix (intracellular material)
Blood (Matrix) is also called a connective tissue as a matrix of blood is the liquid in which blood is suspended.
Thin + flat (substances pass through easily)
Surface of heart, blood vessels and alveoli
Cuboidal Epithelial cells
Roughly cube shaped
Nucleus in centre of cells
Kidney Tubule ducts of glands
6 types - loose, dense, adipose, cartilage, bone and blood
Cartilage:
Firm matrix
Trachea
Support + flexible
Found in joints, trachea, nose and outer ear
Adipose Tissue
Bodies reserve of fat are stored here
Contain large globules of fat + acts as energy storage and cushioning
Loose connective tissue:
Supports + connects - areolar
Found around blood vessels + nerves
Under skin and between muscles
Dense connective tissue:
Tendon - attach muscle to bone
Ligaments - joins bone to bone at a joint
Fibres - give extra stength
Muscular tissues:
Cells are long + thin (fibres)
Cells lie parallel
Cells may contain 7 nuclei
Three types include:
Skeletal
Cardiac
Smooth
Found in walls of the heart
Striations - branching network
Walls of internal organs stomach + bladder
No striations
Cells are tapered
Nervous tissue:
Nerve cells are called neurons + receiving and transmitting messages
5 strands extending from the nucleus - called dendrites