Lesson 1.3 Digestive

This net movement is defined as diffusion. Where do you think this happens mainly in the body?

• Gas exchange sites such as alveoli

• Absorption of nutrients in small intestine

• Removal of waste in kidneys.

• All of the above

Smooth muscle contraction that forces food to travel down the digestive tract is referred to as

• Dilation

• Contraction

• Peristalsis

• Targeting

The small intestine is responsible for both digestion of food and absorption of food.

• True

• False

Which of the following is the correct order on how food travels in the digestive system?

• Stomach , small intestine, liver, pancreas, large instestine

• Small intestine, stomach , large intestine, liver, pancreas

• Stomach, Small intestine, Large intestine

Digestion is:

• The movement of small nutrients from the digestive system into the circulatory/cardiovascular system.

• The breakdown of food into smaller and fine molecules within the digestive system.

Which of the following highlight how absorption is done in the body?

• A. The breakdown of food into smaller molecules and nutrients in the digestive system

• B. The movement of nutrients from high concentration to low concentration areas.

• C. The diffusion of nutrients from the small intestine into the surrounding blood vessels.

• Only B and C.

Digestion of food in the mouth can happen both by mechanical digestion and chemical digestions.

• True

• False

Mechanical digestion is:

• Breaking food down by means of applying force such as grinding and chewing.

• Breaking food down by means of chemical reaction to speed up the process

Indicate what is involved in the chemical digestion happening in the mouth:

• Applied forces by teeth on food

• Saliva produced by salivary glands in mouth

Food moves in chyme form by the help what process:

• Muscle spasm

• Peristalsis

• Arrhythmia

• Respiration