Thorax and lungs, Biology

Assignment Help:

Thorax and Lungs:

The  lungs, a pair of conical-shaped organs lie  in  the  thoracic cavity, protected by the bony  thorax composed of the  sternum and ribs a interiorly and ribs, scapulae and the vertebral column posteriorly. The apices of  lungs lie just  above the clavicles and  the concave base posteriorly extends to the  11th or 12th rib. The lung is described as having a medistinal and a costal surface. The costal surface is  in  contact with  the wall of  the pleural cavity which consist of  the  ribs and intercostals muscles  forming the  thoracic cavity. The thoracic cavity  is  lined with pleura. The pleura  is a continuous serous membrane; one surface of it  lines the inside of the rib &ge  knows as the parietal  pleura and the other surface covers the lungs knows as  the visceral pleura. The space between  the  two  surfaces is known as potential space, containing a  few milliliters of serous fluid that prevents friction between the  two surfaces. 

The  lungs are separated from each other by  the mediastinum which contains the heart and great vessels, the esophagus and, in  its upper part the trachea. The chief feature of the mediastinal  surface is  the presence of the hilum where the main  bronchus and pulmonary  artery enter and pulmonary veins leave the  lungs. Group of lymph glands which drain the  lungs are situated at the hylum and at the bifurcation of trachea. The right and  left lungs are divided by  deep fissures into lobes, the right lungs has upper, middle and lower lobes and left lung has upper and  lower. Each  lobe  is  further divided into segments. Air  is conducted to each segment through the bronchioles the  smallest branches of the bronchi.

336_lungus.jpg


Related Discussions:- Thorax and lungs

What is phosphorylation, What is phosphorylation? What are some biological ...

What is phosphorylation? What are some biological processes in which phosphorylation plays a critical role? Phosphorylation is the name given to processes of the addition of ph

Abscission - effects of plant growth regulators, Abscission - Effects of Pl...

Abscission - Effects of Plant Growth Regulators Abscission of leaves and fruit is one of the more obvious characteristics of senescence. Leaves do not fall simply because they

Differentiation of tissues - root apex, Differentiation of Tissues - Root A...

Differentiation of Tissues - Root Apex New cells generated from the divisions of meristematic cells start expanding and differentiating further. Epidermis, cortex and stele a

Bomb calorimeter, Bomb calorimeter is used to determine the calorific value...

Bomb calorimeter is used to determine the calorific value of solid and liquid fuels. Construction          It consists of following parts 1.      Stainless steel bomb:

How linnaeus classify the plant kingdom, Q. How Linnaeus classify the plant...

Q. How Linnaeus classify the plant kingdom? Linnaeus classified the plant kingdom into 24 classes in his famous work 'Genera Plantarum' (1737) and 'Species Plantarum' (1753). I

Are nematodes triploblastic or diploblastic animals, Q. Are nematodes tripl...

Q. Are nematodes triploblastic or diploblastic animals? Just like platyhelminthes, nematodes are triploblastics that is they present three germ layers (ectoderm, endoderm and m

Illustrate stents, Q. Illustrate Stents? Stents are metallic scaffolds ...

Q. Illustrate Stents? Stents are metallic scaffolds that are deployed within a diseased segment of a coronary artery to establish and then maintain a widely patent lumen. Stent

#titlecylintreta.., Aiscommoncellismwhatsk question #Minimum 100 words acce...

Aiscommoncellismwhatsk question #Minimum 100 words accepted#

Explain intergenic, Intergenic: Amongs the two genes; for example intergen...

Intergenic: Amongs the two genes; for example intergenic DNA is the DNA found amongs two genes. The term is frequently used to mean non-functional DNA (or at least DNA with no kno

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd