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.
Define Precautions for Estimation of Vitamin c in Chillies? 1. Rinse all glassware with 3% metaphosphoric acid before you begin your practical and subsequently each time you wa
Determine Nutritional Requirements in Hot Environments? Hot environments may be of two types: dry hot, as in the case of deserts or hot and humid in tropical rain forests and c
Q. How do schistosomes differentiate regarding sex separation? The Schistosomes are dioecious that is the species has separated sexes, female and male individuals.
What is the name of the larva of corals and sea anemones? What is the biological significance of that larval stage? Sexual reproduction in corals and sea anemones has a larval
Explain Free Water - Water Found in Food? Water which is bound by such minute forces, that its vapour pressure is equal to the vapour pressure of pure water. It can be found as
Slow Moving Waters - Biota of Rivers The habitat of a slowly moving part of the river is very different from the one just described. Here the water flow is comparatively slow
Q. Discuss in brief distant and contact osteogenesis? Three terms are used to describe individual aspects of bone formation process that occur at implants. They are Osteocondu
Q. Which is the part of the human visual system where the receptors that sense light, i.e., the photoreceptor cells, are located? How do those cells work? The photoreceptor cel
Define the Nutrient Requirements during Trauma? Nutritional assessment of the trauma patient is done to determine energy and protein requirements. Basal energy requirements are
Explain the Decolourizing Agent - Ziehl-Neelsen Method? Acid alcohol - a mixture of 95% ethanol and 3% HCI - is used for decolourization. Before decolourization, smear is allow
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