CHAPTER 9.3, 9.4 & 9.5 (F4)

How is food digested and absorbed in the human body?

• Through the respiratory system

• By the circulatory system

• Via the digestive system

• Through the nervous system

Which part of the digestive system is responsible for the absorption of water and vitamins?

• Small intestine

• Large intestine

• Stomach

• Esophagus

What are the role of the liver in the assimilation of digested food?

• Detoxification of drugs and alcohol

• Storage of excess glucose as glycogen

• Deamination of excessive amino acid into urea

• Production of bile

• Cellular respiration to generate energy

What is the function of villi in the ileum?

• Secretion of digestive enzymes

• Absorption of digested food

• Production of bile

• Mechanical digestion

What are the tiny projections on the internal layer of the ileum called?

• Microvilli

• Goblet cells

• Villi

• Lacteals

Which of the following is a function of goblet cells in the villi?

• To transport nutrients

• To secrete mucus

• To absorb fatty acids

• To produce bile

What role do lacteals play in the absorption process?

• They secrete digestive enzymes

• They carry droplets of fatty acids and glycerol

• They increase the surface area for absorption

• They produce mucus

How do microvilli contribute to nutrient absorption?

• By secreting intestinal juices

• By providing a large surface area

• By transporting blood

• By producing bile

Name the structure in the villus involved in the transporting of amino acids.

• Lacteal

• Blood capillaries

• Epithelial cells

• Lipid droplets

Which adaptation of the small intestine increases the surface area for absorption of nutrients?

• Presence of villi and microvilli

• Thick muscular walls

• Long length and narrow diameter

• Smooth inner surface