Sciences - Co-ordinated (9-1) - 0973 CIE

Digestion

Bayani Gaba-gaba

Before any enzyme can work on your food, the food has to be broken into small pieces. That mechanical breaking up, by teeth, by the churning stomach and by bile splitting fat into droplets, is physical digestion. It changes the size of the food, not its chemistry, and it sets the stage for the chemical digestion that follows.

In this lesson you will see why chewing matters so much, learn the four kinds of human teeth and the layers inside a tooth, and discover how the stomach and bile each increase the surface area of food. The thread running through it all is one powerful idea: more surface area means faster enzyme action.

Manufura

Describe physical digestion as the breakdown of food into smaller pieces without chemical change to the food molecules
State that physical digestion increases the surface area of food for the action of enzymes in chemical digestion
Identify in diagrams and images the types of human teeth: incisors, canines, premolars and molars
Describe the structure of human teeth, limited to: enamel, dentine, pulp, nerves, blood vessels and cement, and understand that teeth are embedded in bone and the gums
Describe the functions of the types of human teeth in physical digestion of food
Describe the function of the stomach in physical digestion
[Supplement] Outline the role of bile in emulsifying fats and oils to increase the surface area for chemical digestion

Takardar Darasi

Physical digestion is the body's way of making food easier to digest chemically. A whole steak and a finely chopped steak contain the same molecules, but the chopped one is digested far faster because enzymes can reach more of it. Understanding teeth, the stomach and bile explains why dental care matters and how fats are handled, and it is regularly tested with 'explain the importance of increasing surface area'.

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Nazarin Darasi

Barka da kammala darasi akan Digestion. Yanzu da kuka bincika mahimman raayoyi da raayoyi, lokaci yayi da zaku gwada ilimin ku. Wannan sashe yana ba da ayyuka iri-iri Tambayoyin da aka tsara don ƙarfafa fahimtar ku da kuma taimaka muku auna fahimtar ku game da kayan.

Za ka gamu da haɗe-haɗen nau'ikan tambayoyi, ciki har da tambayoyin zaɓi da yawa, tambayoyin gajeren amsa, da tambayoyin rubutu. Kowace tambaya an ƙirƙira ta da kyau don auna fannoni daban-daban na iliminka da ƙwarewar tunani mai zurfi.

Yi wannan ɓangaren na kimantawa a matsayin wata dama don ƙarfafa fahimtarka kan batun kuma don gano duk wani yanki da kake buƙatar ƙarin karatu. Kada ka yanke ƙauna da duk wani ƙalubale da ka fuskanta; maimakon haka, ka kallesu a matsayin damar haɓaka da ingantawa.

Physical digestion is best described as breaking food into smaller pieces: A. by enzymes B. with a chemical change to the molecules C. without a chemical change to the molecules D. into amino acids Answer: C
A person bites a chunk out of an apple using the flat, chisel-edged teeth at the very front of the mouth. What is the name of these teeth? A. canines B. incisors C. premolars D. molars Answer: B
The very hard outer layer of the crown of a tooth is the: A. dentine B. enamel C. pulp D. cement Answer: B
Which part of a tooth contains the nerves and blood vessels? A. enamel B. cement C. pulp D. dentine Answer: C
The main importance of physical digestion is that it: A. changes food molecules chemically B. increases the surface area of food for enzymes C. absorbs nutrients D. kills bacteria Answer: B