1. How does the nervous system help the lungs to take in oxygen and expel carbon
dioxide?
A. It tells the heart to pump and let the oxygen mixes with the blood.
B. It commands the muscles of the mouth to open for the air to rush in.
C. It delivers information to the arteries to let the exchange of gases takes
place.
D. It sends message to the muscles of the diaphragm to contract as air rushes
in and relaxes as it goes out.

2. Which of the following shows how the nervous system regulates body
temperature?
A. The nerve cells travel under the skin to cool it down.
B. The brain tells the skin to trap the water in to feel cool.
C. The spinal cord produces water and send it to the skin.
D. The brain tells the sweat glands to release water and cool the body.

3. What important function does nervous system do for the circulatory system?
A. It makes the heart tough and strong.
B. It maintains the red color of the blood.
C. It regulates the number of times the heart beats.
D. It allows the smooth flow of blood in the blood vessels.

4. How does the process of digestion in our body happen?
A. The nervous system sends signals to smooth muscles to digest food.
B. Water helps the food in digestion as both enters the mouth.
C. The digestive system works independently.
D. Muscles and bones move to chew the food.

5. Why do we drop the bowl of soup when we feel that it is hot?
A. The reflex action takes place.
B. Oil in the palm makes hot objects slipped easily.
C. The skin cannot resist the pain that is why you dropped it.
D. Muscles and bones sometimes do not coordinate to hold an object.
need na po answer plssss.