Level of organization

• Cells contain organelles:

  Here:

  1. Cells can be eukaryotic or prokaryotic: - eukaryotic cells are complex and include all animal and plant cells. -prokaryotic cells are smaller and simpler, e.g. bacteria
  2. Organelles are tiny structure within cells. You can only see them through a powerful microscope
• Similar cells are Organized into Tissues:

  Here:

  1. A tissue is a group of similar cells that work together to carry out a particular function

  • E.g: plants have a xylem tissue (for transporting water and mineral salts) and a phloem tissue (for transporting sucrose and amino acids).

  2. A tissue contains more than 1 cell type
• Tissue are organized into Organs

  Here:

  1. An organ is a group of tissues working together to perform a function

  E.g:

  • Lungs in mammals and leaves on plants are both organs - they're both made up of several different tissue types
• Organs make up Organ Systems:

  Here:

  1. Organs work together to form organ systems. Each system has a different job.

  E.g:

  • In mammals, the digestive system is made up of organs including the stomach, intestines, pancreas and liver