Lungs - respiratory organs, Biology

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.

Posted Date: 2/4/2013 5:26:59 AM | Location : United States

Related Discussions:- Lungs - respiratory organs, Assignment Help, Ask Question on Lungs - respiratory organs, Get Answer, Expert's Help, Lungs - respiratory organs Discussions

Write discussion on Lungs - respiratory organs
Your posts are moderated
Related Questions
Define Procedure for Testing the Presence of Urea in Milk? 1. To 0.5 ml of milk add 0.5 ml of  DMAB solution  (prepared by dissolving 0.4 gm of p-dimethyl amino benzaldehyde po

What is immunity

The diet prescription The diet prescription designates the type, amount and frequency of feeding based on an individual's disease process and disease management goals. The dis

Determine the meaning of Response cost This is a type of punishment in which the subject has to return back the token (positive reinforcement) earned earlier if the subject dis

Photosynthesis rate varies according to the photic energy intensity. Do the similar occur in aerobic respiration? What happens to the glucose balance as a result of these variation

Explain about the Cancer? The word 'cancer' comes from the Latin for crab. It refers 90 any malignant growth or tumor caused by abnormal and uncontrolled cell division. Body ce

Computed Tomograpy Scan Developments in cross-sectional imaging techniques such as spiral tomography and reformatted computerized tomograms have become increasingly popular in

What are the cells responsible for the production of antibodies? The cells that make antibodies, i.e., the cells of the humoral immune system, are the B lymphocytes (B cells).

If 15% of the nucleotides in a DNA molecule contain guanine, what percentage of the nucleotides having each of the other three bases? Describe your reasoning. As guanine and cy

Describe the term - Ambulacral groove The groove that runs down the oral surface of each echinoderm arm and contain the tube feet. If the region contains a visible furrow, or gr