Science: Human Body Systems Overview
Learning the main body systems and how they work together
Science: Human Body Systems Overview
Learning the main body systems and how they work together
Biology - Grade 6-8
- 1
Name the body system that carries oxygen and nutrients to cells and removes wastes through the blood. Describe its main job.
Think about the system that includes the heart and blood vessels.
The circulatory system carries oxygen and nutrients to cells and removes wastes through the blood. Its main job is to transport important materials throughout the body. - 2
The lungs are the main organs of which body system, and what does that system do?
The lungs are the main organs of the respiratory system. This system brings oxygen into the body and removes carbon dioxide. - 3
Explain how the digestive system helps the body get energy from food.
Include the ideas of breaking down food and absorbing nutrients.
The digestive system breaks food down into smaller nutrients that can be absorbed into the bloodstream. The body then uses those nutrients for energy, growth, and repair. - 4
Which body system includes the brain, spinal cord, and nerves? State one main function of this system.
The nervous system includes the brain, spinal cord, and nerves. One main function of this system is to send and receive messages so the body can respond to changes. - 5
Muscles and bones work together to help the body move. Name these two systems and explain how they interact.
One system provides force, and the other provides structure.
The muscular system and the skeletal system work together to help the body move. Muscles pull on bones, and bones provide support and a framework for movement. - 6
What is the main function of the skeletal system besides helping the body move?
Besides helping the body move, the skeletal system supports the body and protects important organs. For example, the skull protects the brain and the rib cage protects the heart and lungs. - 7
The skin is the largest organ in the body. Which body system is it part of, and what are two jobs it does?
This system includes skin, hair, and nails.
The skin is part of the integumentary system. Two jobs it does are protecting the body from injury and germs and helping regulate body temperature. - 8
How do the respiratory system and circulatory system work together?
The respiratory system brings oxygen into the lungs, and the circulatory system carries that oxygen in the blood to body cells. The circulatory system also brings carbon dioxide back to the lungs so it can be exhaled. - 9
Which body system helps remove liquid wastes from the blood and out of the body? Name one organ in this system.
This system helps control water balance and remove wastes.
The excretory system helps remove liquid wastes from the blood and out of the body. One organ in this system is the kidney. - 10
A person touches a hot pan and quickly pulls their hand away. Which body system detects the heat, and which body system helps move the hand?
The nervous system detects the heat and sends signals. The muscular system helps move the hand away quickly. - 11
Why is it important for body systems to work together instead of separately?
Use an example that involves more than one system.
It is important for body systems to work together because the body depends on many connected processes to stay alive. For example, cells need oxygen from the respiratory system, transport from the circulatory system, and nutrients from the digestive system. - 12
Choose one body system and describe what might happen if it stopped working properly.
If the respiratory system stopped working properly, the body would not get enough oxygen and carbon dioxide would build up. This would make it hard for cells to function and could quickly become life-threatening.