Natural Science - Exam 6th Grade

The human ______ system is a group of organs that extract nutrients from food and eliminate waste products.

What happens when fresh air reaches the alveoli?

It is the large flat muscle under the lungs.

Each bronchus divides into smaller and smaller ...

At the end of each bronchiole, there are tiny air sacs called______

In what order does carbon dioxide leave our body?

It is a flap of cartilage that keeps food out of the lungs.

In the Respiratory System, what is combined with other nutrients to produce energy for our bodies?

How long can food take to pass through the system?

The muscular walls of the stomach contract and relax, mixing the food and gastric juices to form a thick liquid called___

When a bolus of food reaches the stomach, it combines with _____ juices that break down the food and kill dangerous bacteria.

It is a liquid that is produce by salivary glands that makes food easier to chew and swallow.

The Respiratory system releases a waste product/gas called ____

Food waste that the body does not need passes into the ____ , where extra water is absorbed back into the body

Where does the digestive process start?