Functions of the Human Digestive System

This video tutorial covers the human digestive system, focusing on the AITs exam. It explains the four main functions: ingestion, digestion, absorption, and elimination. The video details the roles of the stomach, small and large intestines, and accessory organs like the liver and pancreas. It also discusses key hormones and enzymes involved in digestion. The tutorial concludes with study resources for the AITs exam.

Which of the following is NOT one of the four essential functions of the human digestive system?

• Ingestion

• Digestion

• Elimination

• Circulation

What is the primary role of saliva in the digestive process?

• To absorb nutrients

• To break down carbohydrates

• To transport food to the stomach

• To neutralize stomach acid

What is the function of the epiglottis during swallowing?

• To absorb water

• To prevent food from entering the windpipe

• To secrete digestive enzymes

• To break down proteins

What is the primary function of the lower esophageal sphincter?

• To absorb nutrients

• To store digestive enzymes

• To secrete bile

• To prevent acid reflux

Which part of the small intestine is primarily responsible for the absorption of vitamin B12?

• Colon

• Jejunum

• Duodenum

• Ileum

What is the main function of the ascending colon in the large intestine?

• To break down proteins

• To secrete digestive enzymes

• To absorb water and salts

• To store bile

Which organ is responsible for producing bile?

• Pancreas

• Gallbladder

• Liver

• Stomach

What is the role of insulin in the digestive system?

• To break down fats

• To lower blood sugar levels

• To secrete bile

• To absorb water

Which hormone is responsible for raising blood glucose levels?

• Glucagon

• Gastrin

• Secretin

• Insulin

What is the primary function of bile in the digestive process?

• To break down proteins

• To neutralize stomach acid

• To emulsify fats

• To absorb carbohydrates