Tissue

Question 1

what are tissues?

Answer 1

• A group of cells that are similar in structure & work together to carry out a particular task.
• The structure or function of the tissue allows it to be classified into one of four types.

Question 2

1. Epithelial Tissue

Answer 2

• Covering or lining tissue
• Examples:
  - Outer lining of skin
  - Outer epithelium of organs (lungs, heart, kidneys, intestines, liver)
  - Inner lining of heart, stomach & intestines
• Cells are very closely joined together.
• Vary in shape from thin/flat to column-shaped to cube-shaped depending on tissue.

Question 3

2. Nervous tissue

Answer 3

• Made up specialised nerve cells = neurons
• Have long projections from the body of the cell
• When stimulated, messages are carried along these projections to another part of the body.
• This can be found in the brain, spinal cord & nerves

Question 4

3. Muscular tissue

Answer 4

• Cells of muscular tissue = muscle fibres
  
  • These are long & thin and contract to become shorter
• Voluntary muscle = muscle you can consciously control so you an move when necessary (eg: biceps & triceps of your arm)
• Involuntary muscle = muscle not under our conscious control (eg: muscles that line intestinal tract)
• Striated muscle = muscle made up of dark and light bands making a striped appearance
  -Three types of muscle tissue:
• Skeletal muscle = muscles that are attached to bones
  - Voluntary & striated
• Smooth muscle = found in walls of internal organs
  - Involuntary & non-striated
• Cardiac muscle = muscle that makes up most of the heart, contracts to pump blood around
  - Involuntary

Question 5

4. Connective tissue

Answer 5

• Provides support for the body & helps hold all body parts together.
• Cells are not close together.
• Separated by large amount of material not made up of cells
  - Non cellular material = matrix
• This includes bone, cartilage, tendons, ligaments & fat storage (adipose tissue)