1. How do the organs in the respiratory system work?

A. is a series of organs responsible for taking in oxygen and expelling carbon dioxide. The main organs of this system are the lungs which carry out the exchange of gases as we breathe.

B. is a transport system of the body, responsible for the flow of blood, nutrients, oxygen and other gases, and as well as hormones to and from cells, known as the cardiovascular system, is a network composed of the heart, the bloods vessels, and the blood .

C. is like the manager inside our body. Its function is to control and coordinate the parts of our body so that they work together, doing their job at the right time.

D. breaks down food into smaller portions, absorbs nutrients into the bloodstream and transfers nutrients to the cells to produce energy.

2. How do the organs in the circulatory system work?

A. is a series of organs responsible for taking in oxygen and expelling carbon dioxide. The main organs of this system are the lungs which carry out the exchange of gases as we breathe.

B. is a transport system of the body, responsible for the flow of blood, nutrients, oxygen and other gases, and as well as hormones to and from cells, known as the cardiovascular system, is a network composed of the heart, the bloods vessels, and the blood .

C. is like the manager inside our body. Its function is to control and coordinate the parts of our body so that they work together, doing their job at the right time.

D. breaks down food into smaller portions, absorbs nutrients into the bloodstream and transfers nutrients to the cells to produce energy.

3. How do the organs in the nervous system work?

A. is a series of organs responsible for taking in oxygen and expelling carbon dioxide. The main organs of this system are the lungs which carry out the exchange of gases as we breathe.

B. is a transport system of the body, responsible for the flow of blood, nutrients, oxygen and other gases, and as well as hormones to and from cells, known as the cardiovascular system, is a network composed of the heart, the bloods vessels, and the blood .

C. is like the manager inside our body. Its function is to control and coordinate the parts of our body so that they work together, doing their job at the right time.

D. breaks down food into smaller portions, absorbs nutrients into the bloodstream and transfers nutrients to the cells to produce energy.
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