Biology - 0610 CIE

Absorption

Gbogbo ọrọ náà

Digestion has done its work and your food is now a soup of small soluble molecules. Absorption is the moment they finally cross into your blood. It happens mostly in the small intestine, an organ built like no other for one job: soaking up as many molecules as possible, as fast as possible.

In this lesson you will see where absorption happens and learn the clever tricks the small intestine uses to make its surface enormous: millions of finger-like villi, each covered in even tinier microvilli. Extended students will dissect a single villus and meet the capillaries and lacteals that carry the absorbed food away.

Ebumnobi

State that the small intestine is the region where nutrients are absorbed
State that most water is absorbed from the small intestine but that some is also absorbed from the colon
[Supplement] Explain the significance of villi and microvilli in increasing the internal surface area of the small intestine
[Supplement] Describe the structure of a villus
[Supplement] Describe the roles of capillaries and lacteals in villi

Akọmọ Ojú-ẹkọ

Absorption is the pay-off for all the chewing and enzyme action: it is where nutrients actually enter the body. The small intestine is a textbook example of how structure fits function, which is exactly what examiners love to test: 'explain how the villus is adapted for absorption' is a classic high-mark question.

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Ayẹwo Ẹkọ

Ekele diri gi maka imecha ihe karịrị na Absorption. 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.

Most absorption of digested food takes place in the: A. stomach B. small intestine C. mouth D. rectum Answer: B
Besides the small intestine, some water is also absorbed from the: A. oesophagus B. stomach C. colon D. pancreas Answer: C
[Supplement] The main role of villi and microvilli is to: A. produce enzymes B. increase surface area for absorption C. store bile D. kill bacteria Answer: B
[Supplement] Glucose and amino acids are absorbed mainly into the: A. lacteal B. blood capillaries C. bile duct D. stomach Answer: B
[Supplement] The products of fat digestion are absorbed mainly into the: A. capillaries B. salivary glands C. lacteal D. pancreas Answer: C