The digestive system

Why must large molecules like starch, proteins, and fats be broken down into smaller units during digestion?

• To make you breathe faster after meals.

• So they can be saved in the liver as energy.

• So the lungs can eliminate them as waste.

• So they can be absorbed through the intestinal lining into the bloodstream.

What are the functions of the digestive system?

Which of the following best describes ingestion?

• The process of putting food into your mouth.

• The breakdown of food into small molecules.

• The movement of food through the esophagus

• The absorption of nutrients into the blood.

Which if the following statements about peristalsis is correct?

• It is the rhythmic, involuntary contraction of the muscles of the esophagus.

• It is the process of putting food into your mouth.

• It is the grinding and chewing of food.

• It is the absorption of nutrients.

Which substances present in the stomach and intestines help in chemical digestion?

• acids and enzymes

• water and fiber

• vitamins and minerals

• proteins and fats

Explain how food moves from the mouth to the stomach, mentioning the roles of different organs involved.

Which of the following best describes the function of accessory organs in digestion?

• They are part of the tubular passage where food passes and is digested.

• They help in digestion process by secreting enzymes to further break down food particles.

• They absorb nutrients from digested food.

• They store waste products before elimination.

What is the main role of the digestive system?

• To control body temperature

• To circulate blood

• To protect the body from diseases

• To transform food into nutrients and energy

What happens to food in the mouth?

• It turns into a liquid

• It becomes a moist lump called bolus

• It is absorbed into the bloodstream

• It is stored for later use

What is the role of the stomach in digestion?

• To transport food to the intestines

• To break down food into chyme

• To store food

• To absorb nutrients