Levels of Structural Organisation and Body Systems

Question 1

What are the 6 Levels of structural organisation and body systems?

Answer 1

Chemical
Cellular
Tissue
Organ
Organ System level (Cardiovascular + Digestive)
Organism

Question 2

Chemical

Answer 2

Chemical Level - smallest level is the foundation for each successive level, ranges from tiny atoms to complex chemical structures called molecules; composed of between two and thousands of atoms

Question 3

Cellular

Answer 3

2. Cellular Level - formed by groups of many different types of molecules combined in specific ways to form cellular structures
   
   1. Cells in body vary widely in size, shape and function

Question 4

Tissue

Answer 4

3. Tissue Level - two or more cell types cooperate to perform a common function
   
   1. Tissues consist of two components: Cells and the surrounding material extracellular matrix.
   2. Tissues vary from membrane sheets that cover body cavities to irregularly shaped cartilage found in noses.

Question 5

Organ

Answer 5

4. Organ Level - consists of two or more tissue types combined to form a structure or organ; has a recognisable shape and performs a specialised task
   
   1. Examples include skin, heart and bones.

Question 6

Organ System Level

Answer 6

5. Organ System Level - body’s organs are grouped into organ systems. (The human body has 11 organ systems).
   
   1. Consists of two or more organs that together carry out a broad function in the body.
   2. For example:
      
      1. Cardiovascular system (heart and blood vessels) work together to transport blood through the body.
      2. Digestive system ingests food, absorbs nutrients and eliminates wastes.

Question 7

Organism

Answer 7

Organism Level - Organ systems function together to make up the working human body, an organism.