Human nutrition：练习题

A deficiency of which vitamin in the diet is the primary cause of scurvy?

A student consumes a meal containing proteins, fats, and carbohydrates. In which part of the alimentary canal does the chemical digestion of all three of these nutrients occur simultaneously?

Which statement best explains the physiological importance of bile in the human digestive system?

Where in the human digestive system is the enzyme amylase secreted, and where does it carry out its chemical function?

A patient is found to have a significantly reduced rate of chemical digestion of fats in the small intestine, despite having a functional pancreas producing lipase. Further examination reveals that their liver is producing bile, but it is not reaching the duodenum effectively.

Which statement correctly explains the physiological reason why fat digestion is impaired in this scenario?

Describe two main functions of hydrochloric acid in gastric juice during the process of human digestion.

A balanced human diet contains several essential dietary components.
(a) State the dietary deficiency that causes the disease scurvy.
(b) State the dietary deficiency that causes the disease rickets.
(c) Name the enzyme produced in the human digestive system that breaks down starch into simple sugars.
(d) State the region of the alimentary canal where chemical digestion of protein begins.

The diagram shows the human digestive system with certain organs labelled W, X, Y, and Z.
(a) Identify the organs labelled W and X.
(b) State the role of organ Y in chemical digestion by naming two different digestive enzymes it secretes.
(c) Organ W produces bile, which is stored in the gall bladder before entering the small intestine. Explain two main functions of bile in the digestion of fats.