Question

D. Differentiate between
1. digestion and absorption.
3. small intestine and large intestine.
2. mechanical digestion and chemical digestion
4. digestion and assimilation.
E. Find the odd one out. Give reasons for your choice.
1. oesophagus, stomach, small intestine, liver 2. canines, incisors, saliva, premolars
3. salivary amylase, pepsin, trypsin, erepsin
4. lactase, maltase, lipase, sucrase
F. Answer the following in short.
1. How do teeth help in digestion?
2. What is dental plaque?



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Answer 1

Answer:

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Diabetes

Our digestive system provides us with one of the essential functions of life, Nutrition, which helps to provide us with energy and provides our body with building blocks to create new body cells from.

The digestive system is essentially a tube which extends from the mouth to the rectum.

COMPONENTS OF THE DIGESTIVE SYSTEM

Food passes through the digestive system in the following order:

Mouth

Esophagus

Stomach

The small intestine

Colon (large intestine)

Rectum

Through this process a number of enzymes act on the food we eat (inc liver, pancreas, gall bladder).

THE MOUTH AND ESOPHAGUS

In the mouth, saliva acts to start to break down carbohydrates thanks to an enzyme called amylase. The esophagus is a tube, controlled by muscles and autonomic nerves, that helps food to travel from the mouth to the stomach.

THE STOMACH

The stomach coats the food with a mixture of acid and digestive enzymes to help break the food down further. A layer of mucous protects the stomach lining from being damaged by the acid.

The bottom of the stomach is able to contract, which helps to speed up the process. When the food is broken down sufficiently the stomach releases its contents into the duodenum.

Diabetes and the stomach

THE SMALL INTESTINE

The small intestine is categorised in three parts; the duodenum being the first, the jejunum second and the ileum the final part.

When food enters the duodenum, the pancreas releases enzymes to help break down fat, protein and carbohydrate The gall bladder releases bile, which has been produced by the liver, to help further break fats down into a form that can be absorbed by the intestines.

The small intestine is lined with finger-like projections, called villi, which provide a very large surface area facilitating the absorption of nutrients, including carbohydrates, proteins and fats, into the bloodstream.

The small intestine also plays a key role in regulating blood glucose levels The small intestine contains a number of receptive cells which detect the presence of macronutrients and secrete hormones which instructs the pancreas on how much insulin and glucagon to release.

Diabetes and the small intestine

THE COLON (LARGE INTESTINE)

The final stage of the digestive system is the colon (large intestine) which absorbs water and salts before the remains are passed out of the rectum as faeces. The colon can also help to absorb remaining carbohydrate and some fats.

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Answer 2

Answer:

In the world of geography exists The Seven Natural Wonders of the World: The Grand Canyon, Iguazú Falls, Yosemite Valley's giant sequoias, Mount Everest, the harbor of Rio de Janeiro, the Nile River, and the Aurora Borealis. Among these natural wonders, the Grand Canyon is one of the most grandest and beautiful. Appropriately named, the Grand Canyon is so enormous that it can even be seen from space. The Canyon is unmatched throughout the world in the landscapes that it offers to its visitors. Although it not the deepest canyon in the world, the Grand Canyon is known throughout the world for its overwhelming size and its colorful landscape. The park preserves more than 2,700 archaeological sites of Native Americans, who have lived there at least 4,000 years. The Grand Canyon became a National Park in 1919.

It is not certain exactly how old the Grand Canyon actually is. Although rocks that are exposed in the walls of the canyon are geologically quite old, the Canyon itself is fairly. The oldest rocks at the canyon bottom are close to 2000 million years old. The Canyon itself was an erosional feature, which has only formed in the past five or six million years. So, geologically speaking, the Grand Canyon is considered quite young.

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