organisation of cells

• • Cells are the fundamental units of life, each designed to perform specialised functions through a process called DIFFERENTIATION.
  • These specialised cells combine to form TISSUES, which then group to create ORGANS.
  • Multiple organs work together to form ORGAN SYSTEMS within larger multicellular organisms.

  
• TISSUES:

  group of similar cells with similar structures and function that work together to carry out specific jobs. 
• TISSUE EXAMPLE:

  • Muscular tissue: Responsible for movement by contracting and relaxing.
  • Glandular tissue: Produces and releases substances like enzymes and hormones.
  • Epithelial tissue: Covers the surfaces of the body, such as the inside of the gut.
• ORGANS:

  complex structures composed of different tissues, each contributing to the organ's overall function.

  e.g: the HEART is an organ that contains muscular tissue for PUMPING BLOOD around the body
• ORGAN SYSTEM 


  group of ORGANS working together to perform complex functions for the organism's survival.

  e.g: The CIRCULATORY SYSTEM is an example of an organ system