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!
Circulatory System - Developmental Changes
We have learnt that throughout foetal life, gas exchange takes place, only through the placenta and not through lungs. Therefore, the foetus has various features in its circulatory systems that are not present in an adult. Diagram is a diagrammatic representation of foetal and infant circulation. In the foetus the oxygenated blood flowing back through the umbilical vein mainly bypasses the liver and goes to the right atrium.
Figure: Changes After Birth in Circulatory System
The blood then passes to the left atrium directly by an opening called foramen ovale. From the left atrium the blood flows to the left ventricle that sends the blood to the head and rest of the body. Blood returning from the head moves by the right atrium to the right ventricle which then does not pump the blood to the lungs but to a shunting vessel the ductus arteriosus that connects along with the descending aorta. A pair of umbilical arteries branch off from the aorta and carry deoxygenated blood to the placenta. At birth the umbilical artery and vein collapse while the cord is tied or the placenta separates, the result of it (here is negative pressure in the right atrium and blood flows back from the left atrium to the right. The flow causes the one way valve to close in the foramen ovale. Thus the left and right atria are separated. The shunting vessels which bypassed the liver and the lungs also collapse and adult pattern of circulation starts. The entire process takes place within a few hours of birth, though the permanent closure of foramen ovale may take up to a year.
Distinguish between epithelial and connective tissues with respect to their cell arrangement? PROVIDE a specific example( for both tissue types) of how the arrangement of cells hel
What is Rationale for Menu Planning? 'Menu', as we all know, is nothing but a list of dishes planned for preparation, and forms the very core of all activities in the food serv
Q. Dietary considerations oesophagitis? The dietary considerations for this condition are the same as in oesophag it is. The patient should be recommended to: • eat smaller
What is biotechnology? Biotechnology is the application of biological knowledge to get new techniques, materials and compounds of pharmaceutical, medical, agrarian, industrial
Q. What is the name given to conditions in which the own immune system of the individual is the agent of diseases? What are some examples of these conditions? Diseases caused b
GROWTH RATE IN ANIMALS - Growth rate is different at different periods of life. Growth period in human may be studied in 5 steps - (i) Prenatal - In gestation period fo
The term farm animal genetic resources (AnGR) is used to include all animal species, breeds and strains (and their wild relatives) that are of economic, scientific and cultural int
State about the Latent squint disease Latent squint is seen commonly as exophoria in infancy and presbyopic age and esophoria in childhood. Hypermetropes can have esophoria and
Q. What are the three major types of RNA? What is meant by heterogeneous RNA? Messenger RNA, or mRNA, transfer RNA, or tRNA, and ribosomal RNA, or rRNA, are the three main type
Which physical elements contributed to the great amount of available energy on the primitive earth at the time of the origin of life? 3.5 billion years since the water cycle wa
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