P4 Human Body Systems (Concept Map)
Primary 4 Science — Concept Map
Created by Miss Clarissa Ng · www.clartutors.com
The body is a system of systems
Different parts, each with its own job, all working together to keep the body alive
A system is different parts working together for one function; the body has several systems.
Digestion follows one order: mouth → gullet → stomach → small intestine → large intestine.
The small intestine does most of the digesting and absorbs the digested food; the large intestine absorbs only water from undigested food.
Digestive supplies digested food, respiratory supplies oxygen, circulatory carries both, muscular and skeletal use them to move.
Only what each system does is required — the names of individual bones and muscles are not.
What a system is
Parts work togethera system is made of different parts that work together to do one job
Living things are systemsa body is made of parts that work together so the organism can survive and grow
The digestive system
Breaks food downdigestion breaks food into simpler substances so it can be absorbed into the blood
Why it mattersthe simpler substances give the body energy, and are used for growth and repair
Mouth to stomach
Mouth and teethchewing grinds food into smaller pieces, increasing the surface area to digestive juices so digestion is faster
Gulletpushes the food from the mouth down to the stomach
Stomacha muscular bag that churns food with digestive juices
Absorbing the food
Small intestinemost digestion happens here, and the digested food is absorbed into the bloodstream
Large intestineno food is digested here; only water is absorbed from the undigested food
The other systems
Respiratory systemallows gaseous exchange between the body and the surroundings to take place
Circulatory systemcarries digested food, oxygen and water to all parts of the body
Skeletal systemsupports the body, gives it shape and protects parts such as the brain and lungs
Muscular systemworks with the skeleton so the body can move; muscles contract or relax
Working together
Food and oxygenthe digestive system supplies digested food and the respiratory system supplies oxygen
Carried to the bodythe circulatory system carries both to all parts of the body
Then movement happensthe muscular and skeletal systems use that energy to move the body
One job eachevery system has its own function, but the body needs all of them working at once