Grade 3 Science: The Human Body and Health
Free Grade 3 Science unit on The Human Body and Health: 10 lessons in order, starting with Major internal organs. Includes practice questions and answer keys.
10 lessons in this unit
Major internal organs
Learn what organs are and meet the main organs inside the body: brain, heart, lungs, stomach and intestines.
Lesson 2The brain
Learn that the brain controls the body, receives messages from the senses, helps us think, remember and feel, and needs protection.
Lesson 3The heart
Learn that the heart pumps blood around the body, measure pulse and see how exercise changes heart rate.
Lesson 4The lungs
Learn that the lungs take in oxygen and remove carbon dioxide, model them with a balloon and bottle, and protect lung health.
Lesson 5The stomach
Learn that the stomach is a muscular bag that mixes food with juices, begins breaking food down and passes it on.
Lesson 6The intestines
Learn that the small intestine takes in nutrients and the large intestine takes in water and forms waste, and see how long the intestines are.
Lesson 7Digestion introduction
Learn the full journey of food through the digestive system from mouth to waste, and which organ does what.
Lesson 8Breathing
Learn how breathing works, measure breathing rate and see how exercise changes breathing.
Lesson 9Nutrition
Learn about the food groups, what each does for the body and how to build a balanced meal from local foods.
Lesson 10Healthy habits
Learn healthy habits: washing hands, brushing teeth, sleeping well, being active, drinking safe water and caring for feelings.