Body Systems

Front

What is an external stimulus?

Back

An external stimulus is a change in the environment that can provoke a response from an organism, such as smelling food and feeling hungry.

Front

What system is responsible for delivering oxygen to the body?

Back

The respiratory system is responsible for delivering oxygen and removing carbon dioxide from the body.

Front

How does the respiratory system work with the circulatory system?

Back

The circulatory system brings waste gases to the lungs and exchanges them for oxygen.

Front

What is the role of hydrochloric acid in the stomach?

Back

Hydrochloric acid helps break down proteins in food into amino acids, which is a chemical change.

Front

What organ pumps blood throughout the body?

Back

The heart pumps blood throughout the body to supply oxygen and nutrients.

Front

What is the function of the lungs?

Back

The lungs are responsible for gas exchange, taking in oxygen and expelling carbon dioxide.

Front

What is a chemical change?

Back

A chemical change occurs when substances combine or break apart to form new substances, such as digestion.

Front

What is the role of enzymes in digestion?

Back

Enzymes help break down food into smaller molecules that the body can absorb.

Front

What is the difference between physical and chemical changes?

Back

A physical change alters the form of a substance without changing its chemical composition, while a chemical change results in new substances.

Front

What is the excretory system responsible for?

Back

The excretory system removes waste products from the body, including excess water and salts.