HUMAN RESPIRATORY SYSTEM

WITH EVERY BREATH ,air passes through the nasal cavity..down the pharynx(throat),larynx("voice box" ),and trachea(wind pipe) to the lungs.The nasal &nb sp; cavity warms the and moistens air ,and the tiny layers in the lining protect the airway against the damage by foreign bodies.During swallowing , the tongue moves up and back,the larynx rise,the epiglottis closes off the entrance to the trachea, and the soft palate separates the nasal cavity from the pharynx.Saliva,
secreted from three pairs of salivary glands,lubricates food to make swallowing easier,it also begin the chemical break down of food ,and help to produce taste.The senses of taste and smell are closely linked .Both depend on the detection of dissolved molecules by sensory receptors in the olfactory
nerve endings of the nose and in the taste buds of the tongue.

RESPIRATORY SYSTEM.

Comments

REVOLUTIONS-INDUSTRIAL AND INFORMATION

INDUSTRIAL REVOLUTION Starts in Europe particularly in England in eighteen century.It changed the whole of Europe and England 's economy.During this period New machines are invented in England to speed up the spinning of wool and cotton .At first they were powered by water wheels but later steam engines are developed.Iron become cheaper and stronger as Iron making techniques improved.Canals are dug to carry coal from the mines and to transport finished goods.After ...

WEB SITES TO ENTERTAIN YOU

If you get bored from the web viewing the same stuff over and over again -social media ,blogs, news etc then you certainly need some thing different that can soothe your soul and give you some kind of entertainment then here are some sites that can solve your purpose. Bored Panda Bored Panda is the place you want to be when you want to discover interesting and visually appealing content. It's a blog that publishes regular updates on the coolest finds in travel, photography, illustration, animals, DIY, technology, design and all sorts of other great categories. You can also create an account to vote posts up or down. Brain Pickings . ...

KEY BOARD SHORT CUTS

While surfing the Web, these commands could help you and are absolutely worth learning. By making repetitive motions faster, web surfing becomes so easy and pleasant! The following shortcuts can be work with desktop versions of Chrome, Firefox, and IE. CTRL-T to launch a new browser tab page. Tabbed pages are very useful: they let you open multiple web pages simultaneously without the same memory load as a full browser window. Simply press CTRL-T to launch a new tab. Related: use CTRL-Page Up and CTRL-Page Down to navigate between the tabs. CTRL-Enter to type 'www.' and '.com' Once you ...

knowledge want

Search This Blog