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!
Circulation Patterns
All vertebrates have some similarities in their circulatory systems but as vertebrate life changes from aquatic to terrestrial, the pattern of circulation becomes more complex. Fish and mammals represent two extremes in vertebrate circulation and Fig. 3.6 compares the two. The principal difference is in heart structure, from two chambered in fish to four chambered in mammals. The fish heart contains two main chambers in series the atrium or auricle and the ventricle. There are two subsidiary chambers (not shown in Figure) the sinus venosus which proceeds the atrium and conus arteriosis which comes after the heart.
These contain valves that prevent backwards flow of blood. Blood makes a single circuit from the heart to the gills where it is' oxygenated and then to the dorsal aorta to be distributed to the body from where it returns to the heart by the veins. Such a system has the advantage that all of the blood going to the body has already been oxygenated in the gills. However, there is a disadvantage i.e. the narrow gill capillaries slow down the blood flow resulting in a low blood pressure. This slows the rate of oxygen delivery to the cells and limits the metabolic rate that fish can attain.
Figure: Circulatory system pattern in (a) fish and (b) mammals. Rust shows oxygenated blood
Define Immediate Preoperative Period during Surgery? Nothing should be given by mouth for at least 8 hours before a general surgery so that the stomach has no leftover food at
Explain Counter Stain - Ziehl-Neelsen Method? Methylene blue is used to stain previously decolourized cells. All non acid-fast bacteria de-stained by acid alcohol now absorbs c
Describe tranposition of great arteries with intact ventricular septum? Transposition of great arteries with intact ventricular septum (or small VSD): There is usually inadequa
molecular test protocol for infectious disease and full test procedure and scientific flyer
learn allchapter
Explain Prosoma in details. First tagma of a cheliciform consisting of the first six segments of the body. Appendages on the prosoma are involved in locomotion and feeding. Pro
in a school laboratory, what is usually regarded as evidence that photosynthesis has occurred in plants
CEREBRU M - Largest part of brain. 2/3 of brain. 4/5 of brain's weight. Cerebrum is devided into 2 cerebral hemispheres by longitudinal cerebral fissure. Gyri and sul
Explain the Numerical Taxonomy? Numerical methods in taxonomy are not new. Simple statistical methods like standard deviations, t-tests and chi-squared have been used for sever
how is the heart initiated for its function
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: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd