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!
Define Proteins as biological buffers?
Proteins have the ability to accept or donate hydrogen ions and by doing so they serve as biological buffers. In blood, there are three important buffering systems - plasma proteins, haemoglobin and carbonic acid bicarbonate. The equilibrium reactions for each of these buffering systems are as follows:
The first of these buffering systems, the plasma proteins, functions as a weak acid1 salt buffer when the free carboxyl groups on the protein dissociate, or as a weak base/salt buffer when the free amino groups dissociate. Although the buffering ability of the plasma protein is extremely important in maintaining blood pH, it is not as important as the other two systems, the second buffering system, carbonic acid-bicarbonate, is extremely effective because there are reactions which follow this equilibrium which will regulate either acids or bases.
The H2CO3 level in plasma never goes too high because it is in equilibrium with CO2 (H2CO3 → CO2 + H2O), which is expired by the lungs. In blood, this equilibrium proceeds very quickly because of the presence of carbonic anhydrase, an enzyme found in red blood cells which catalyze it. If the carbonic acid-bicarbonate reaction goes in the opposite direction, the concentration of the HCO3- so formed will be regulated by the kidneys. The third important buffering system in blood results from haemoglobin. Haemoglobin has six times the buffering power of the plasma proteins. It functions well as a buffer because it is present in large amounts, it contains 38 histidine residues (Histidine residues are good buffers because they can dissociate to H+ and the imidazole group) and because haemoglobin exists in blood in two forms, reduced haemoglobin and oxy haemoglobin. It is thus a weaker acid and a better buffer.
Sexually-transmitted diseases Many travelers have new sexual contacts during their journeys and are at increased risk for acquiring sexually transmitted diseases including HIV
I need help with p-p, q-q and r-r intervals and heart rates
Accidents Resulting in Death Accidents that cause death are dealt with in a different way. The law requires full compensation to the widow for complete life or until remarriag
What is the significance of Choanocyte? Unique collar-shaped cells whose flagella are responsible for generating water current in the sponge. As flagella beats, food particles
Q. What are the major biological processes in which calcium participates? Calcium is present in approximately all cells and has various functions. Calcium has an significant ro
Q How does the presence of exoskeleton describe the general small size of arthropods? Since they have periodic ecdysis and exoskeleton, the growth of arthropods is limited to a
Q. Fluids requirement in ulcerative colitis? Fluids: A liberal intake of fluid should be given to prevent dehydration. The passage of at least 1200 ml of urine indicates that a
The Biological Catalysis Enzyme: Biological catalysis are called enzyme. An enzyme can be defined as an organic substance that tremendously accelerates a chemical reaction w
What is Vacuole ? Another structure found only in plant cells is the large central vacuole. The vacuole stores enzymes and waste products, in addition to providing the turgor p
Incompatibility - Pollination and Fertilization Plants growing under natural conditions have a preference for their mating partners. The stigma of the female parent receives a
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