Energy Use
What happens to energy when a person/animal is resting?
What is energy use decreases
True or false; when a human/animal loses weight, the mass disappears
False
Which body system brings oxygen into the body
Respiratory system
What gas must enter the body in order for energy releasing reactions to happen?
Oxygen
What is one reason scientists use models instead of just words
Models help show how parts of a system interact
Name one body process that slows down when energy use is low
What is Heart rate or breathing rate
Name one substance that carries mass out of the body
CO2 and H2O
Which system transports food molecules to cells?
Circulatory system
What two substances are produced in the chemical reaction to create energy
Carbon dioxide and water
Name TWO parts that should appear in a model showing energy use?
Cells, Oxygen, Fat, blood, energy
Which has MORE energy available: an animal that is active or one that is resting? Why?
What is resting uses less energy due to fewer processes happening
What part of the body removes carbon dioxide?
Lungs
Why is the circulatory system important for energy use?
It delivers oxygen and food molecules to cells
What two materials are needed for chemical reactions that release energy from food molecules?
oxygen and food molecules
Why is a model stronger when it includes lables instead of only pictures?
Labels help explain what each part represents/avoids confusion
What would happen to energy use if breathing suddenly increased? Explain.
Energy use would increase due to more reactions happening
The fat is converted into CO2 and H2O that leaves the body in our breathe/sweat
Which two systems work together to release energy from fat?
Respiratory and circulatory systems
An organism has used up all of its stored fat and is still not eating. Where would its cells get energy from next
From other body tissues like muscle
What should happen to oxygen in a energy model?
It enters from lungs and is used in chemical reactions
Explain why an organism can stay alive for a long time without eating
Stored fat provides energy
Explain where most of the mass goes when stored fat is used for energy
Into the air as carbon dioxide and water
Explain what could happen if oxygen could not reach cells
Cells could not release energy from store fat
Why is oxygen necessary even when no food is currently being eaten?
Oxygen is needed for reactions that release energy from fat
How should a model change when an organism runs out of stored fat but still needs energy?
It should show other body tissues being broken down and used in chemical reactions to release energy