SCIENCE LESSONS ABOUT THE LIVER

The human liver and its functions
The liver is located in the upper right-hand part of the abdominal cavity, below the diaphragm, and on top of the stomach, right kidney, and intestines.
It is cone shaped; it is a dark reddish-brown organ because of the enormous blood volume it carries. In weight it lies between 1.44-1.66kg.
It is supplied with blood from:
a.    the hepatic artery bringing in Oxygenated blood
b.    the hepatic portal vein bringing in Nutrient-rich blood  from the digestive system
The liver consists of two main lobes, and each lobe is made up of thousands of lobules. The lobules are connected to small ducts that connect with larger ducts which join up to form the hepatic duct. The hepatic duct transports the bile produced by the liver cells to the gallbladder and duodenum.

The science about the mouth and its hygiene

The books of science put it that in the human mouth are the; tongue, salivary glands, and teeth.

The tongue is a very important organ in a way that it aids speech, tasting of food, rolling of food, and swallowing. The tongue has taste buds for sweet, bitter, sour and salty chemicals. The foremost part of the tongue tastes sweet and salty chemicals. Sweet chemicals are also tasted at the end of the tongue toward the throat. Salt is also tasted from the sides of the tongue.

Taste buds for bitter chemicals are located mainly at the inner end of the tongue. There is normally a tendency of vomiting very bitter substance when they get to this region as we try to swallow. Sour chemical substances are tasted from the sides (left and right) of the tongue. Because of the tongue it is easy to sort bad from good foods.

The salivary glands release a fluid called saliva. Saliva is sticky, colorless, and very useful. Saliva has the following functions: softening food as we chew; sticking/binding small food particles together to form a bolus for swallowing; lubricating the mouth cavity; and contains the enzyme called salivary amylase (ptyalin) which chemically digests starch into maltose. Amylase starts the chemical digestion of starch.

The teeth are hard bony structures within the mouth. They are held firmly in the jaws by cement and gums. Their functions are; chewing, cutting, grinding, tearing and sorting food.the teeth also aid speech and prevent the jaws from falling in more so in old age. They have some little gaps in between.