Sciences - Co-ordinated (Double) - 0654 CIE

Digestion

Gbogbo ọrọ náà

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.

Ebumnobi

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

Akọmọ Ojú-ẹkọ

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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Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.

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Ayẹwo Ẹkọ

Ekele diri gi maka imecha ihe karịrị na Digestion. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.

Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.

Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.

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