3. Two delicate connectives join the anterior visceral ganglion with the two commissural ganglia on the circumaoesophageal connectives. The cardiac stomach opens into the pyloric stomach through a narrow X-shaped cardio-pyloric opening, guarded by an anterior, one posterior and two lateral valves. On each lateral side of the hastate plate lies an elongated lateral groove. For the process of respiration, there are special respiratory organs present in these organisms. They are arranged vertically one, behind the other in a row. It also includes several sense organs to permit the entry of different messages from outside. The pre-segmental region remains in adult and carries the stalked eye and the first segment disappears during the process of transformation. Gills or Branchiae: There are eight pairs of gills. The mixed water carbon dioxide is expelled from the ventral region of the gill chamber because of the movement of scaphognathite and epipodite. A typical tactile seta (Fig. The inner lining is muscular and has one anterior, two lateral and one posterior folds. Respiratory system diagram: Function, facts, conditions, and more These epipodites being present in the anterior portion of the gill-chamber performs respiratory functions like the primitive gills. In prawn, the respiratory pigment, haemocyanin is dissolved in plasma and carries oxygen to the tissue cells. 3. PDF Respiration in Prawn Our mission is to provide an online platform to help students to discuss anything and everything about Zoology. This cookie is set by GDPR Cookie Consent plugin. The inner lining bears one anterior, one posterior and two lateral folds. In bright light, they are extended and in weak light they are retracted. The green glands perform two important functions: 1. Before publishing your Notes on this site, please read the following pages: 1. The position of these paired openings depends upon the sex of the individual. Describe respiratory system controll brain? From the posterior end of the thoracic ganglionic mass originates ventral nerve cord which runs up to the posterior-most segment. A pair of small hepatopancreatic arteries arise from the heart, ventrolateral to the roots of the antennary arteries. It communicates with the exterior through a small ureter. Excretory System 8. Leaf-like, with two inner lobes acting as gnathobases and an outer lobe.
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