Cells, Tissues, Organs & Organ Systems

• Organelles ➔ cells ➔ tissues ➔ organs ➔ organ systems 
• What is a tissue?

  A group of similar cells working together to perform a common function
• What is the cardiovascular system an example of?

  organ system
• In plants, what are leaves examples of?

  organs
• What is the definition of an organ?

  A group of different tissues...

  ...working together to perform a common function
• What organs are part of the cardiovascular system?

  heart

  blood vessels
• Explain, using an example, why the digestive system is considered an 'organ system'?

  The digestive system is considered an organ system because it consists of a group of organs...

  ...that work together to perform the common function...

  ...of digesting and absorbing our food (this mark is for describing the function of the system)

  For example the pancreas releases digestive enzymes which help break down the food molecules, while the small intestine absorbs the nutrients