Because their body recognizes the A and the B types of blood, and O is recognized by all types because it has no genes
Yes.
Yes. Members of the Church of Jesus Christ of Latter-day Saints (the 'Mormon' church) accept and use modern medicine. They have absolutely no problem with blood transfusions. Many Mormon congregations host regular blood drives to assist local hospitals in providing blood transfusions.
A blood bank is for people to donate blood and to receive blood that people donated to get blood transfusions.
People with different blood types have different types of antibodies. For example, a person who is A- cannot accept blood from a person who is B- because his/her anitbodies would attack the donor's blood cells making them inefficient.
Yes, they simply refuse blood transfusions - all other procedures they accept
Blood banks, and the Red Cross which collects blood for blood banks, do not accept blood from people who have HIV, and they also test the blood that they collect in case it has infections that they were not warned about. Every effort is made to keep HIV out of blood that will be used for transfusions.
Jehovah's Witnesses don't accept any kind of whole blood transfusions. They will not accept products containing major blood components, ie whole red cells, whole white cells, whole plasma, or whole platelets.They will accept transfusions of all fractions of those components, eg haemoglobin, and non-blood alternatives.According to the Official Jehovah's Witesses Media siteunder "Alternatives to blood transfusions" (see link below)"Jehovah's Witnesses request nonblood alternatives, which are widely used and accepted by the medical community. [...] Since the Bible makes no clear statement about the use of minor blood fractions or the immediate reinfusion of a patient's own blood during surgery, a medical process known as blood salvaging, the use of such treatments is a matter of personal choice."
he help give people positiive thoughts on blood transfusions
No, they do not accept transfusions of whole plasma. If however the plasma (93% of which is water) is broken down into its parts then yes, all of the separate parts can be transfused.
Nowadays blood is screened for illnesses before it is used in transfusions.
Yes. Millions of people across the world undergo blood transfusions every day
they ask people to donate blood so that they can give the blood to people who need it because they have lost alot of blood and or going to have a transplant or oporation.