Physical digestion：練習題

How do the muscular walls of the stomach contribute to physical digestion?

Which statement best describes the primary structural role of cement in a human tooth?

If a spherical mass of food is broken down into many much smaller spheres, the total volume remains the same. Which statement correctly identifies the change in the surface area to volume ratio (\( \text{SA:V} \)) and its effect on chemical digestion?

What is the outermost, hardest layer of a human tooth called?

Which part of a human tooth contains the living tissue, including the nerves and blood vessels?

State the name of the hardest tissue that forms the outer layer of a human tooth and describe its specific function during the physical digestion of food.

In the context of physical digestion, how do the structural features of human premolars and molars differ to suit their specific functions in the breakdown of food?

Explain how the process of physical digestion carried out by bile in the duodenum facilitates a more rapid rate of chemical digestion of lipids.

(a) Define physical digestion.
(b) Explain how physical digestion increases the efficiency of chemical digestion, providing an example.
(c) Name the four types of human teeth and briefly describe their specific roles in physical digestion.

Physical digestion is essential for preparing food for the action of enzymes.
(a) Describe the mechanical action of the stomach and explain how it assists in the subsequent chemical digestion of proteins.
(b) Explain why the emulsification of fats by bile is classified as physical digestion rather than chemical digestion.
(c) Compare the functions of incisors and molars in the mouth and explain how their shapes are adapted to these specific functions.