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 will happen to resting membrane potential, What will happen to resting...

What will happen to resting membrane potential if potassium succinate were injected into the intracellular environment (cytoplasm) of a neuron?

Phylum protozoa, what is the classificatin of phylum protozoa with orders

what is the classificatin of phylum protozoa with orders

Requirements of various nutrients in constipation, Q. Requirements of vario...

Q. Requirements of various nutrients in constipation? The requirements of various nutrients are not altered in constipation. It is essentially a normal balanced diet (normal RD

Adrenal medulla, ADRENA L MEDULLA The adrenal medulla develops from th...

ADRENA L MEDULLA The adrenal medulla develops from the neuroectoderm of the embryo. Medulla consists of chromaffin cells or phaeochromocytes. These cells are connected wi

Citrate levels would be low in the cytosol, When the ratio of insulin to gl...

When the ratio of insulin to glucagon is >1, which is the following is true with regards to fatty acid synthesis? -malonyl CoA will inhibit carnitine palmitoyl transferase 1

Can you explain protease inhibitors, Q. Can you explain Protease inhibitors...

Q. Can you explain Protease inhibitors? Ans. Protease inhibitors are the compounds which are found to some extent in cereal grains such as oats, wheat, barley and mai

Phylum protozoa, Make a detailed study on phylum protozoa taking an example...

Make a detailed study on phylum protozoa taking an example with clear labeled diagram

Diagnosis, D i a g no s i s Diagnosis, the key for successful ma...

D i a g no s i s Diagnosis, the key for successful management of the disease problem, refers to identification of the cause of a disease. The process of diagnosis requir

Illustrate natural and phylogenetic classification, Q. Illustrate Natural a...

Q. Illustrate Natural and Phylogenetic Classification? Natural Classification Natural systems of classification reflect the situation as it might have existed in nature. T

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