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
Explain the term Brown-Sequard Syndrome Brown-Sequard syndrome is a rare spinal disorder that results from an injury to one side of the spinal cord in which the spinal cord is
What are the Results of Chronic Pulmonary Thromboembolism? Results : The reported mortality is between 5 and 24 per cent. On follow-up, the six-year survival in the best ce
Define Measuring Direct Aerobic Fitness (VO 2 max) For direct measurement of VO, max, the subject is asked to perform exercise for 12 to 15 minutes. A stationary bicycle or a
Define Aerobic Exercise or Aerobic Energy System? To produce necessary energy, the body uses an aerobic pathway and an anaerobic pathway. Exercise that relies heavily on oxygen
Define Investigative Techniques in Nutritional Biochemistry? It is an important component of this manual as it focuses on providing an understanding of biochemical methods, tec
Admission of Mentally Patient: Voluntary Basis (Voluntary Admission) Any adult person who considers himself to be mentally ill, can request the Medical Officer for
Alluvial Materials of this catego~ya re deposited by running water in the form offroodplains, river terraces, deltas and alluvial fans. These deposits have two outstanding char
In the long term reversible causes of heart failure like valvular lesions, myocardial ischemia, uncontrolled hypertension, arrhythmias, alcohol, negative inotropic agents, intracar
Mineral supplements and Mineral supplements and enhancing the bio-availability of minerals The proper balance of protein, energy, vitamins, and minerals is needed in the ratio
In agriculture areas, farmer pay close attention to d weather forecast. Right before a predicted overnight freeze, farmers spray water on crops to protect the plants. Use the prope
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