Lungs - respiratory organs, Biology

Assignment Help:

Lungs - Respiratory Organs

In arachnid arthropods such as scorpion and spider, respiration takes place by means of book lungs. There are four pairs of these structures in the scorpion, opening at the four pairs of slit like stigmata on the ventral sternum. Each book lung takes the type of a small hollow sac (pulmonary sac) filled along with clusters of lamellae, 130 to 150 in number. These lamellae are disposed like the leaves of a book. The leaves are borne on an axis. Each leaf is hollow and the blood to be oxygenated flows in the narrow slit such as cavity, separated from the air by membranous walls. The spiracle opens into an atrial chamber. Each lung is enclosed in a pulmonary cavity. The lamellae consist of respiratory air derived from the atrium and blood circulates in the spaces among the lamellae. It is here that exchange of gases occurs through the thin walls of the lamellae. Air enters the lamellae by diffusion, but in some species the atrium is reported to generate a ventilating action by means of muscles.


Related Discussions:- Lungs - respiratory organs

Open and closed type of circulatory systems, Open and Closed Type of Circul...

Open and Closed Type of Circulatory Systems There are two categories of circulatory system found in higher metazoans. In one type the original blastocoel carries on to be the

Explain dna binding domains, Helix-turn-helix This  motif  have  of  tw...

Helix-turn-helix This  motif  have  of  two    -helices  divided  by  a  short  (four-amino   acid) peptide  sequence  which  forms  a   -turn that shown in above figure.  When

Temperate deciduous forest - ecosystem, Temperate deciduous forest - Ecosys...

Temperate deciduous forest - Ecosystem The temperate forests are characterised by a moderate climate and broad-leafed deciduous trees, which shed their leaves in fall, are bar

DIGESTION, GIVE ADETAILED ACCOUNT OF THE VARIETY OF FUNCTIONS PERFORMED BY ...

GIVE ADETAILED ACCOUNT OF THE VARIETY OF FUNCTIONS PERFORMED BY THE LIVER

Bohr effect, Bohr Effect Another important influence is the pH. Increa...

Bohr Effect Another important influence is the pH. Increase in carbon dioxide or other acids lowers the pH of plasma and shifts the dissociation curve to the right. At high ca

Why do male and female gametes diffrent from each other, Q. Concerning thei...

Q. Concerning their size and basic morphology how and why do the male and the female gametes differentiate from each other? The female gametes are big cells full of vitellus (n

Contra indication in circulatory assist devices, Contra Indication :  It i...

Contra Indication :  It is absolutely contra indicated if their is more than trivial aortic regurgitation. Aortic aneurysm and severe aorto iliac disease are also contra indicatio

Define lamivudine, Lamivudine This oral antiretroviral nucleoside analo...

Lamivudine This oral antiretroviral nucleoside analog used to treat HIV is also FDA-approved for treatment of chronic HBV infection. A trial in Asian patients with chronic HBV

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