Human Organ Systems
Year 5 students explore the major organ systems of the human body — including digestive, circulatory, and respiratory — understanding how organs work together to keep us alive.
What You Need to Know
Key Concept Diagram
The digestive system breaks food into nutrients that are absorbed into the bloodstream for energy and growth
The circulatory system uses the heart to pump blood, carrying oxygen and nutrients to every cell in the body
The respiratory system takes oxygen from the air into the lungs and removes carbon dioxide waste
Organ systems work together — for example, the respiratory and circulatory systems cooperate to supply oxygen to all cells
Key Vocabulary
Organ
A structure made of specialised tissues that performs a specific function in the body
Organ system
A group of organs working together to carry out a major body function
Circulatory system
The system of the heart, blood, and blood vessels that circulates blood through the body
Respiratory system
The system including the lungs and airways that enables breathing and gas exchange
Knowledge Check
Select the correct answer for each question. Click "Check Answer" to see if you are right.
Question 1
What is the primary function of the heart?
Question 2
Where does gas exchange (oxygen in, carbon dioxide out) occur in the body?
Question 3
Which body system breaks down food into nutrients the body can use?
Key Concepts Summary
- ●The digestive system breaks food into nutrients that are absorbed into the bloodstream for energy and growth
- ●The circulatory system uses the heart to pump blood, carrying oxygen and nutrients to every cell in the body
- ●The respiratory system takes oxygen from the air into the lungs and removes carbon dioxide waste
- ●Organ systems work together — for example, the respiratory and circulatory systems cooperate to supply oxygen to all cells