October 28, 2026
Class 4 Human Body Questions with Answers
Class 4 human body practice: digestion, breathing, the heart and the skeleton, with answers and explanations.
- practice-questions
- class-4
- science
In Class 4, children move from naming body parts to understanding systems, organs that work together to do one job. The digestive system breaks down food, the respiratory system brings in oxygen, the circulatory system carries it around the body, and the skeletal system holds everything up.
What your child should know
- Digestive system: mouth, food pipe, stomach and intestines break down food.
- Respiratory system: the lungs take in oxygen and give out carbon dioxide.
- Circulatory system: the heart pumps blood through blood vessels.
- Skeletal system: bones support the body and protect organs like the brain and heart.
5 Human body questions with answers
Read each question with your child and let them answer before you open Show answer.
Q1. How many lungs does a healthy human usually have?
A) One
B) Two
C) Three
D) Four
Show answer
Answer: B) Two
Most healthy humans have two lungs.
Q2. Which organ pumps blood to all parts of the body?
A) Lungs
B) Brain
C) Heart
D) Stomach
Show answer
Answer: C) Heart
The heart pumps blood throughout the body.
Q3. Which organ helps us think, remember, and control our body?
A) Kidney
B) Liver
C) Brain
D) Lung
Show answer
Answer: C) Brain
The brain controls the body's activities and helps us think and remember.
Q4. Which body system carries oxygen and nutrients to all parts of the body?
A) Digestive system
B) Circulatory system
C) Skeletal system
D) Nervous system
Show answer
Answer: B) Circulatory system
The circulatory system carries blood, oxygen, and nutrients throughout the body.
Q5. Which sequence correctly shows the path of food through the digestive system?
A) Mouth → Stomach → Food Pipe → Intestines
B) Mouth → Food Pipe → Stomach → Intestines
C) Stomach → Mouth → Intestines → Food Pipe
D) Food Pipe → Mouth → Stomach → Intestines
Show answer
Answer: B) Mouth → Food Pipe → Stomach → Intestines
Food passes from the mouth to the food pipe, then the stomach, and finally the intestines.
How to practise human body at home
- Feel your heartbeat before and after running on the spot, and talk about why it changes.
- Trace the path of a bite of food from mouth to stomach on a simple drawing.
- Watch a short animated video on one system at a time, then quiz each other.
Keep going
More Class 4 Science questions · Class 3 Animal Adaptations Questions with Answers · Class 3 Food and Nutrition Questions with Answers · Class 5 States of Matter Questions with Answers · All practice questions
Practise more with Brain & Bounce Kids
These questions come from the Brain & Bounce Kids question bank. In the app, your child gets five minutes of Science practice a day at the right level for Class 4, an explanation after every answer, and a Parent Zone that shows which topics need work.
Frequently asked questions
- What are the main human body systems in Class 4?
- Usually the digestive, respiratory, circulatory and skeletal systems, sometimes with the muscular and nervous systems too.
- Which organ exchanges oxygen and carbon dioxide?
- The lungs. When we breathe in, oxygen passes into the blood, and carbon dioxide passes out to be breathed out.