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Sunday, 14 September 2014

Fun Ear Facts for Kids

Ajit Sharma September 14, 2014 human body facts , 0 Comments

human body facts

Interesting facts about human ears and our sense of hearing

Fun Ear Facts for Kids

Check out our fun ear facts for kids and enjoy a wide range of interesting information about human ears.

Learn about the different parts that make up your ears, how they communicate with your brain, what Eustachian tubes are, how hearing works, why we produce ear wax and much more. Read on and have fun learning about ears!

Our ears help us detect sound.
Ears convert sound waves into nerve impulses that are sent to the brain.
While your ears pick up the sound, it is your brain that does the hard work of making sense of it all.
There is much more to the ear than the part you can see on the outside of your head.
The middle part of the ear (behind the ear drum) amplifies sound pressure.
The middle ear also contains the Eustachian tube which helps equalize pressure and drain mucus.
Ear infections are more common in children because of their developing immune systems and differences between their Eustachian tubes and those of adults.
The inner ear is found inside the temporal bone, the hardest bone in the human body.
The inner ear contains the spiral shaped hearing organ called the cochlea as well as the vestibule and semicircular canals which help with balance.
Sounds waves are passed from air to liquid in the inner air. The inner air also contains tiny hair cells which react to sound waves, triggering chemicals that are sent to the brain as nerve impulses.
Abnormalities in the inner ear of humans can cause deafness.
Skin glands in the ear canal produce ear wax which helps protect the ear by lubricating it and cleaning it of dirt and dust.
Excessive ear wax can impair hearing, especially if it is pressed hard against the eardrum.
Ear wax normally comes out of your ear naturally so it’s not a good idea to try and remove it yourself unless it is causing health problems (best to see your doctor first).
Piercing earlobes and ornamenting them with jewellery has been common practice around the world for thousands of years for both for cultural and cosmetic reasons.

Digestive System Facts

Ajit Sharma September 14, 2014 human body facts , 0 Comments

human body facts

Digestive System Facts

Learn some interesting digestive system facts for kids. The digestive system of humans and other animals plays a vital role in how the body processes the food we eat.

There are many components of the digestive system from saliva and chewing food through to the stomach and intestines. Read on to find out how the digestive system works, why we get that grumbling sound in the pit of our stomachs and many other interesting facts.

The digestive system is responsible for breaking down food we eat into smaller components so that nutrients can be easily absorbed by the body and the waste discarded.
There are two types of digestion. Mechanical digestion is the physical breakdown of large pieces of food into smaller pieces through, chewing (mastication). While chemical digestion uses enzymes to break down this food mass further into small molecules which the body can separate and use.
Saliva in our mouths plays a key role in initial digestion by moistening the food to help with the mechanical chewing and swallowing process. Saliva also contains an enzyme which starts the chemical digestion of starchy foods.
Our salivary glands produce around 1.5 litres of saliva each day!
Bolus is the name of the small round slurry mass produced for swallowing as a result of chewing and starch digestion.
The pharynx, at the back of the throat, has a flap of tissue called the epiglottis that closes during swallowing to prevent food going down the trachea (windpipe).
Once swallowed, bolus (food) travels down through the esophagus to the stomach, taking about 7 seconds to get there.
Muscles in the esophagus tighten and relax to create a wave-like process called peristalsis which pushes food down the small tube, which is why your food never falls back out if you happen to be eating and swallowing upside down!
Enzymes called proteases break down proteins within the stomach and small intestine. While in saliva, amylases break down carbohydrates and lipases break down fats.
The adult stomach has a very small volume when empty but can expand to hold up to 1.5 litres of food when full.
The inner wall of the stomach secretes hydrochloric acid to help kill bacteria and, along with proteases enzymes, aids in the digestion of food. To protect itself from the corrosive acid, the stomach lining must create a thick coating of mucus.
Stomach rumblings (borborygmi) are caused by wave-like muscular contractions (peristalsis) at the walls of the stomach and small intestine. These are normal digestion movements, however the process is louder and more noticeable when the stomach is empty as the sound is not muffled.
Some animals such as cows, giraffes and deer have stomachs with multiple compartments (not multiple stomachs as is commonly believed). While others like seahorses, lungfishes and platypuses have no stomachs at all.
The small intestine is composed of a duodenum, jejunum, and ileum.
Most of the digestion and absorption of food nutrients actually takes place in the small intestine. The stomach passes on a thick liquid called chyme and enzymes continue to break this down in the small intestine which absorbs the nutrients into the bloodstream.
The pancreas secretes enzymes for use by the small intestine.
On average, the human adult male's small intestine is 6.9 m (22 ft 6 in) long, and the female's 7.1 m (23 ft 4 in).
The large intestine includes the cecum, appendix, colon, and rectum. It is the final part of the digestive system. It absorbs water from the remaining indigestible food matter, and passes any un-needed waste from the body.
The large intestine is approximately 1.5 m (4.9 ft) long.
The liver produces bile for the digestive system and processes the nutrients.
The gall bladder stores the bile used to break down dietary fat.

Brain Facts

Ajit Sharma September 14, 2014 human body facts , 0 Comments

human body facts

Brain Facts
Check out these fun brain facts for kids and learn some interesting facts and information that will help explain more about this amazing part of the human body

The human brain is like a powerful computer that stores our memory and controls how we as humans think and react. It has evolved over time and features some incredibly intricate parts that scientists still struggle to understand.
The brain is the center of the human nervous system, controlling our thoughts, movements, memories and decisions.
With evolution, the human brain has become more and more complicated, many of its interesting properties are still not well understood by scientists.
The brain contains billions of nerve cells that send and receive information around the body.
The human brain is over three times as big as the brain of other mammals that are of similar body size.
Each side of the brain interacts largely with just one half of the body, but for reasons that are not yet fully understood, the interaction is with opposite sides, the right side of the brain interacts with the left side of the body, and vice versa.
The largest part of the human brain is called the cerebrum. Other important parts include corpus callosum, cerebral cortex, thalamus, cerebellum, hypothalamus, hippocampus and brain stem.
The human brain is protected by the skull (cranium), a protective casing made up of 22 bones that are joined together.
The brain of an adult human weighs around 3 pounds (1.5 kg). Although it makes up just 2% of the body's weight, it uses around 20% of its energy.
The brain is suspended in Cerebrospinal fluid, effectively floating in liquid that acts as both a cushion to physical impact and a barrier to infections.
Diseases of the brain include Alzheimer’s disease, Parkinson's disease and multiple sclerosis. Diseases such as these can limit the normal function of the human brain.
Most strokes result from a blood clot in the brain that blocks the local blood supply, this causes the damage or destruction of nearby brain tissue and a wide range of stroke symptoms.

Blood Facts

Ajit Sharma September 14, 2014 human body facts , 0 Comments

human body facts

Blood Facts
Enjoy these blood facts while learning some interesting facts and information about blood type, cells, pressure, plasma, donation and more. Found in humans and most animals, blood is an incredibly important bodily fluid that transports oxygen and various nutrients to our body’s cells.

Blood makes up around 7% of the weight of a human body.

Blood contains red blood cells, white blood cells and platelets.

These blood cells float in a yellow liquid called blood plasma. Blood plasma is made up of 90% water and also contains various nutrients, electrolytes, gases, proteins, glucose and hormones.

Blood plasma can be separated from the cells by spinning blood in a device known as a centrifuge until the cells collect at the bottom of the tube.

Red blood cells have the important job of carrying oxygen around the body. They also contain a protein called hemoglobin. Hemoglobin contains iron which combines with oxygen to give hemoglobin and our blood, a red color.

Red blood cells develop in bone marrow and circulate in the body for around 120 days.

White blood cells are an important part of the body’s immune system. They defend against certain bacteria, viruses, cancer cells, infectious diseases and other unwanted materials.

Platelets help blood clot in order to limit bleeding when your skin is cut. Blood clots can occasionally have negative effects, if they form in blood vessels going to the brain they can cause a stroke while clotting in a blood vessel going to the heart can lead to a heart attack.

As well as delivering important substances to our cells, blood also helps take away unwanted waste products.

Grouping human blood types can be a difficult process and there are currently around 30 recognized blood types (or blood groups). You might be familiar with the more simplified “ABO” system which categorizes blood types under O, A, B and AB. Do you know which blood type you are?

Many generous humans around the world give blood donations every year. This blood is used in important blood transfusions or made into medication.

There are strict rules that limit the number of people who can volunteer blood donations. These include screening processes that test for diseases that could be transmitted by a blood transfusion as well as ensuring recovery time for the donor’s body to replace its own blood.

One of the principal signs of life for humans is blood pressure, this is the measure of pressure that circulating blood has on the walls of blood vessels. Blood pressure is usually taken from a person’s upper arm. Although averages vary from person to person, a general human being is known to have a normal blood pressure of around 112/64 mmHg. High blood pressure can increase the risk of a stroke or heart attack.

Forum Trike

Sunday, 14 September 2014

Fun Ear Facts for Kids

Digestive System Facts

Brain Facts

Blood Facts