Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Closed Type of Circulatory Systems
Some non-chordates, like cephalopods (octopuses, squids), earthworms, polychactes and all vertebrates have a closed circulation along with blood flowing in a closed circuit of tubes from arteries to veins by capillaries. There is better separation of functions in closed circulatory system as compared to in open system. In a closed circulation the heart is the main propulsive organ, pumping blood into arterial system and keeps a high blood pressure in arteries. The arterial system, in turn, works as a pressure reservoir forcing blood through the capillaries. The capillary walls are thin, so permitting high rates of transfer of material between blood and tissues. A blood returning from the systemic circulation that is directed to the gills.
Much of the returning blood flows through the two lateral vena cava through the kidneys before arriving at the bases of the gills. Near the base of each gill is a bulbous accessory pulsatile organ, the branchial heart that receives the systemic venous blood. This heart pumps the blood into an afferent branchial vessel, through which it passes through capillaries in the gill to the efferent branchial vessel and return to the systemic heart. Physiologically the circulatory systems of cephalopods (squid and Octopus) resemble those of chordates far much more than to those of the other molluscan groups. As for example, both cephalopods and chordates have closed circulatory systems; the blood volume of octopus is comparatively small, about 6% of the body weight, well within the range of that of vertebrates however radically lower than in non-cephalopod molluscs.
V AGIN A - Median, elastic, muscular tube 7.5 cm long. Open into vestibule by vaginal orffice. The lining forms vaginal rugae. Space between vaginal wall & cervix is forn
How to calculate the Net Protein Utilization (NPU)? Mitchell (1922) introduced the term 'Net Utilization of Dietary Protein' which is a product of digestibility coefficient and
Aneuploidy : One or inore chron~osomes of a normal set nlay bc lacking or present in excess. The term riullison~y refers to absence of both the chromosomes of a pair. Monosomy, tri
What are the stomata? How these structures participate in the plant transpiration? The Stomata (singular, stoma) are small specialized passages for gases and water present in t
Q. What is the valve that separates the duodenum from the stomach called? What is its function? The valve that separates the stomach from the duodenum is the pylorus it has the
Various acute complications of diabetes mellitus are described in this unit. Acute complications develop within a short period of time. These are due to improper treatment of diabe
Extraradicular Infections Whatever the cause of post endodontic disease we should do proper diagnosis to determine what is the cause; is it intra or extraradicular infection ,
Dietary management during Myocardial Infarction? Patients who suffer from an attack of myocardial infarction are hospitalized and are usually kept under strict medical supervis
L u mp y skin disease The disease, reported from Sudan in 1970 and Egypt in 1988, is caused by a member of the Capripox virus. It affects cattle and is restricted to African
Foot-and-mouth disease Foot-and-mouth disease (FMD) is an extremely contagious viral disease of cloven footed animals most notably cattle, pig and sheep. It is well known for
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!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd