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

Lentic ecosystems, Lentic Ecosystems Lakes are inland, depressions co...

Lentic Ecosystems Lakes are inland, depressions containing standing water. They vary considerably in area and depth. The largest lake in the world, the lake Superior in North

What are the main intraspecific ecological interactions, Q. What are the ma...

Q. What are the main intraspecific ecological interactions? The major harmonious intraspecific ecological interactions are societies and colonies. The major inharmonious intras

Kjlkjkp, Ask quesouou9ution #Minimum 100 words accepted#

Ask quesouou9ution #Minimum 100 words accepted#

Calculate the electric field at a point midway, Three charges are at the co...

Three charges are at the corners of an equilateral triangle, as shown in the figure below. Calculate the electric field at a point midway between the two charges on the x-axis. (Le

Explain about low blood sugar, Q. Explain about Low blood sugar? Low bl...

Q. Explain about Low blood sugar? Low blood sugar can also be caused by accidentally taking too much of insulin. When this occurs, more insulin is present in the body than nee

Explain about the term- therapeutic, Explain about the term- Therapeutic ...

Explain about the term- Therapeutic Therapeutic approaches that scientists are pursuing include transplanting cells to replace those which are damaged or using growth factors

Indications for coronary artery bypass surgery, Indications for Coronary Ar...

Indications for Coronary Artery Bypass Surgery :  The modalities of treatment for coronary artery disease iuc: (1) medical, (2) angioplasty and stenting, and (3) coronary arte

Explain typical components of a closed circulatory system, What are the typ...

What are the typical components of a closed circulatory system? The typical components of the closed circulatory system are the blood vessels within which blood circulates (vei

Define effect of feeding method on drug availability, Define Effect of feed...

Define Effect of feeding method on drug availability? The form in which a drug is administered or enters the body can influence its absorption, metabolism or excretion. This be

Is a viral infection treated with drug, Q. Is a viral infection treated wit...

Q. Is a viral infection treated with the same kind of drug that treats bacterial infections? The Antibacterial drugs, potent against a great variety of bacteria, are not effect

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