Digestive system：练习题

What is the main function of the oesophagus in the human digestive system?

Which of the following processes is correctly defined as the movement of nutrients from the alimentary canal into the blood?

Protein digestion involves different proteases acting at different stages. Which of the following correctly compares pepsin and trypsin?

Which statement best describes physical digestion?

Which statement correctly describes the sequence of events and the role of bile as food moves from the stomach into the small intestine?

Identify two main organs that are part of the alimentary canal.

Explain how the structure of the small intestine is adapted for efficient absorption of nutrients.

How do villi and microvilli structurally adapt the small intestine to maximize the rate of nutrient absorption into the blood?

Explain the specific physiological difference between the processes of absorption and assimilation in the human body. In your answer, include one example of how a glucose molecule is used once it has been assimilated into a muscle cell.

The digestive system relies on coordination between the alimentary canal and associated organs.
(a) Describe the pathway of pancreatic juice from the pancreas to its site of action and name one protease it contains.
(b) Explain how the liver and gall bladder contribute to physical digestion, and why this process is necessary for the subsequent action of lipase.