Choose the letter ofthe best answer.

1.What happens to the food after chewing?

What is the mass of food called as it enters the small intestine?

Which part of the digestive system physically digests the food?

Digestive system breaks down food which serves as a good source of energy needed by our body. Which shows the path of food in the digestive system?

Which structure prevents the swallowed food from going ino the trachea?

What do you call the rythmic, wave-like ovement of some muscles in yourbody?

Nostrils are the opening into the nasal passages that are lined with hairs called cilia. Why are cilia important?

Which is the major function of the integumentary system?

Which part of the skin contains fats for food and energy storage?

Skin helps our body to maintain normal state. How does the skin regulates body temperature?

What do you call the outermost layer of the human skin that protects the body?

What kind of blood vessels that carry oxygen-rich blood away from theheart?

They are thin- walled and floppy blood vessels that carry oxygen poor blood back to the heart.

Blood is the liquid part of the circulatory system. Which is the mainwork of the blood?

The function of this blood component is to stop the blood bleeding, or it clots the blood if it is exposed to the air.

Which of the following is the main organ of the nervous system?

The nervous system has many different functions in the body. Which of the following does NOT describe the nervous system?

What is the largest part of the brain?

Why is our nervous system important?

Why do you suddenly move your hand away even before realizing  that you touched a hot object?