The small intestine is divided into three parts called the duodenum, jejunum, and ileum. Most of the digestion takes place here in the small intestine, where absorption also occurs. Once most of the absorption of water and digested nutrients is completed in the small intestine, the remaining waste products move to the large intestine.

ACID: Chemical compound found naturally in plants or derived from minerals. The word acid is derived from a Latin word, which means “sour”.  Taste of acid is sour. There are many substances that contain acid and so taste sour. For example – lemon, curd, pickles, orange juice, vinegar, etc.

• Nutrition in Human Beings:

Digestion of food in human beings begins in the mouth. The mouth cavity contains teeth, tongue and salivary glands. The teeth cut the food into small pieces, chew and grind it. This is called physical digestion. Salivary glands produce saliva which mixes with the food. This involves chemical digestion of food. The saliva contains an enzyme called salivary amylase which digests the starch and converts it into maltose sugar. Mouth opens into a small funnel shaped area called pharynx which leads to a long tube called oesophagus. It carries the food down into the stomach. The wall of oesophagus is muscular. When the slightly digested food enters the food pipe, the walls of the oesophagus starts contraction and expansion movements called peristaltic movements which push the food into the stomach. Digestion does not take place in the oesophagus.
The glands present on the walls of the stomach secrete gastric juice that contains hydrochloric acid, the enzyme pepsin and mucus. A small amount of gastric lipase is also present that breaks down the fats present in the food. Gastric juice is acidic due to the presence of HCl which is necessary for the pepsin to become active and converts the proteins into peptones. The mucus protects the stomach walls from HCl. From the stomach, the partially digested food goes into the small intestine through sphincter muscle. Small intestine is divided into two parts: Duodenum and Ileum.
Duodenum receives the secretions of two glands, liver and pancreas through a common duct. Liver secretes bile which is alkaline and contains salts to emulsify the fats (or lipids). The bile secreted by the liver is stored in the gall bladder. Pancreas secretes pancreatic juice which contains trypsin, lipase and pancreatic amylase. Trypsin digests the proteins, lipase emulsifies the fats and pancreatic amylase breaks down the starch. Thus, small intestine is the site of complete digestion of carbohydrates, proteins and fats. The walls of ileum secrete succus entericus which completes the digestion process. 

The walls of small intestine has finger like projections like villi which increases the surface area for absorption. The villi are richly supplied with blood vessels which take the absorbed food to each and every cell of the body, where it is utilised for obtaining energy, building up new tissues and the repair of old tissues.

The unabsorbed food is sent into the large intestine where more villi absorb water from this material. The rest of the material is removed from the body via the ****. The exit of this waste material is regulated by the **** sphincter.

Fleece made from organic sources is usually from sheep fur or wool. 

• Clinical Thermometer: A clinical thermometer consists of a long narrow uniform glass tube. It has a bulb at one end. This bulb contains mercury. Outside the bulb a small shining thread of mercury can be seen.

Reading a thermometer: The temperature difference indicated between the two bigger marks should be noted and note down the number of divisions between these marks.

Litmus paper would change its colour to red as acids change the colour of litmus paper to red

Nutrition is important for human beings and animals as it lead to growth and development .

1. Herbivores like cow, horse, and goat have wide, blunt teeth. Such teeth are suitable for pulling plants off the ground and grinding them.
2. Herbivores like cow and camel have the ability to bring back previously swallowed food to the mouth for chewing it the second time. This helps them to absorb most of the nutrients from hard-to-digest food like grass.
3. Squirrels have a pair of broad, sharp-edged front teeth (incisors) in each jaw They use these teeth to gnaw food items like nuts.
4. Herbivores like butterfly and hummingbird do not need to worry about chewing their food. They have mouth-parts shaped like a straw to suck nectar from flowers.

The small intestine or small bowel is the part of the <a href="https://en.m.wikipedia.org/wiki/Human_gastrointestinal_tract" title="Human gastrointestinal tract">gastrointestinal tract</a> between the <a href="https://en.m.wikipedia.org/wiki/Stomach" title="Stomach">stomach</a> and the <a href="https://en.m.wikipedia.org/wiki/Large_intestine" title="Large intestine">large intestine</a>, and is where most of the end absorption of food takes place. The small intestine has three distinct regions – the <a href="https://en.m.wikipedia.org/wiki/Duodenum" title="Duodenum">duodenum</a>, <a href="https://en.m.wikipedia.org/wiki/Jejunum" title="Jejunum">jejunum</a>, and <a href="https://en.m.wikipedia.org/wiki/Ileum" title="Ileum">ileum</a>. The <a href="https://en.m.wikipedia.org/wiki/Duodenum" title="Duodenum">duodenum</a> is the shortest part of the small intestine and is where preparation for <a href="https://en.m.wikipedia.org/wiki/Small_intestine#Absorption">absorption</a> begins. It also receives <a href="https://en.m.wikipedia.org/wiki/Bile" title="Bile">bile</a> and <a href="https://en.m.wikipedia.org/wiki/Pancreatic_juice" title="Pancreatic juice">pancreatic juice</a> through the <a href="https://en.m.wikipedia.org/wiki/Pancreatic_duct" title="Pancreatic duct">pancreatic duct</a>, controlled by the <a href="https://en.m.wikipedia.org/wiki/Sphincter_of_oddi" title="Sphincter of oddi">sphincter of Oddi</a>. The primary function of the small intestine is the absorption of <a href="https://en.m.wikipedia.org/wiki/Nutrient" title="Nutrient">nutrients</a> and <a href="https://en.m.wikipedia.org/wiki/Mineral" title="Mineral">minerals</a> from food, using small finger-like protrusions called <a href="https://en.m.wikipedia.org/wiki/Intestinal_villus" title="Intestinal villus">villi</a>.

Steel scale becomes hot, plastic scale does not heated on other side  and divider becomes hot.