Lungs - respiration, Biology

Assignment Help:

Lungs - Respiration

Lungs can be simple, characterised by air exchange with surrounding environment by diffusion only. These are called the diffusion lungs and are present in small animals such as pulmonate snails, small scorpions, sane spiders and some isopods. The other type - ventilation lungs are typical of vertebrates.

2440_Lungs - Respiration.png

Figure: Breathing Cycle in Frogs

The air passes through a tube into inflatable lungs where gas exchange takes place and oxygen poor, carbon dioxide rich air is then forced out usually through the same tube. This is known as tidal flow of air. Ventilation of the lungs can take place in two different ways:

1) By using a pressure pump as in amphibians. Figure shows the process of ventilation in frog. The inflation of lungs depends on positive pressure bucco pharengeal pump. The nares remain open while glottis is closed (the air does not enters the lungs). The floor of the buccal cavity is raised and lowered periodically. At irregular intervals the glottis is open and nares are closed. The floor of the buccal cavity is raised forcing air into the lungs. As a result the frog can take in air several times without exhaling and blow itself up to considerable size. The glottis can close and while the air remains inside the lungs the cycle is replated in the buccal cavity.

2) By using a suction pump. Exhalation can be passive and inhalation is aided by muscle contraction or as in mammals, by contraction of muscular dome shaped diaphragm and external intercostal muscles lifting the ribcage. This decreases the pressure in the pleural space so causing the lungs to expand and air flows in.

 


Related Discussions:- Lungs - respiration

Is the esophagus a muscular organ, Is the esophagus a muscular organ? Why e...

Is the esophagus a muscular organ? Why even in a patient lying totally flat on a hospital bed can the swallowed food reach the stomach? The esophagus is a predominantly muscula

Abscisic acid, Abscisic Acid Abscisic acid (ABA) as a naturally occurr...

Abscisic Acid Abscisic acid (ABA) as a naturally occurring growth inhibitor was discovered through independent investigations of different physiological phenomena in two diffe

What are the three categories of food protein, What are the three categorie...

What are the three categories in which food protein sources can be divided into Protein food sources can be separated into the following three categories: Proteins of pl

Applications of oracle clinical in pharmaceutical industries, Question 1: ...

Question 1: Write the applications of Oracle clinical in Pharmaceutical industries Explain what is "Oracle clinical" Explain different application of oracle clinical

Why do sharks need to agitate their body to swim, How dissimilar are the sw...

How dissimilar are the swimming strategies in osteichthyes and in chondrichthyes? Why do sharks need to agitate their body to swim while bony fishes do not? Bony fishes have a

Define ailing and failing, Define ailing and failing Clinically unhealt...

Define ailing and failing Clinically unhealthy implants are classified as "ailing" or "failing". It is necessary to distinguish between an ailing versus a failing implant to de

Name the food require during thyphoid, Food require during thyphoid So ...

Food require during thyphoid So remember the foods to be included are: Juices, soups, dal water, broths. Refined cereals and their products (e.g. maida, rava, bread, rice

What is st elevation in leads without q-wave, Q. What is ST Elevation in Le...

Q. What is ST Elevation in Leads without Q-Wave? ST elevation in leads without Q-waves can occur in few very different situations, both of which are fairly uncommon. The first

Clinical features of tricuspid regurgitation, Q. Clinical Features of tricu...

Q. Clinical Features of tricuspid regurgitation? Patients with severe primary tricuspid regurgitation will have symptoms of fatigue, dyspnoea and effort intolerance, abdominal

Special situations of pulmonary embolism, Q. Special situations of Pulmonar...

Q. Special situations of Pulmonary Embolism? The CXR is often abnormal in pulmonary embolism. Atelectasis and other focal pulmonary parenchymal abnormalities are the most commo

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