Respiratory
This muscle helps you breathe by moving up and down.
What is the diaphragm?
This organ pumps blood throughout the body.
What is the heart?
This organ controls the body and processes information.
What is the brain?
These two systems work together to deliver oxygen to cells.
What are the respiratory and circulatory systems?
This waste gas must be removed from the body
What is carbon dioxide?
These tiny air sacs in the lungs are where oxygen and carbon dioxide are exchanged.
What are alveoli?
These blood vessels carry blood away from the heart.
What are arteries?
These carry messages from the brain to the rest of the body
What are nerves?
Which system tells your heart to beat faster when you run?
What is the nervous system?
If arteries are blocked, oxygen cannot easily reach cells. Which system is directly affected first?
What is the circulatory system?
When you inhale, oxygen moves from the lungs into this system.
What is the circulatory system (or bloodstream)?
This part of the blood carries oxygen.
What are red blood cells?
This is the body’s quick response to danger without thinking.
What is a reflex?
What would happen if the lungs could not exchange gases properly?
The body would not get enough oxygen and cells could not function properly.
Why would brain cells die quickly without oxygen?
They need oxygen for energy; without it they cannot function.
Explain why a person breathes faster during exercise.
The body needs more oxygen and must remove more carbon dioxide.
Why is the circulatory system important to the nervous system?
It delivers oxygen and nutrients to the brain and removes wastes.
Explain how the nervous system helps you catch a ball
Eyes send signals to brain → brain processes → nerves send signals to muscles to move hands.
Why do all three systems need to work together during exercise?
Nervous system signals movement → respiratory brings in more oxygen → circulatory delivers oxygen to muscles.
Compare the jobs of the brain and the heart.
The brain controls and sends messages; the heart pumps blood.
Describe how oxygen travels from the nose to the bloodstream in order.
Nose → trachea → bronchi → lungs → alveoli → capillaries (bloodstream).
Describe how the circulatory and respiratory systems work together.
The respiratory system brings oxygen into the lungs, and the circulatory system carries that oxygen to body cells.
If the nervous system signals the body to run, what happens next?
Heart rate & breathing increase
A person trips and scrapes their knee. Describe how all three systems respond.
Nervous system senses pain and sends signals, circulatory system brings blood to heal, respiratory provides oxygen for energy and healing.
Predict what would happen to the body if the nervous system stopped sending signals to the diaphragm.
Breathing would stop because the diaphragm would not move.