For transplantation of hea in human being, which of the animal hea has been used
## **Core Concept**
The question revolves around the concept of xenotransplantation, specifically in the context of heart transplantation. Xenotransplantation involves transplanting living organs or tissues from one species to another, in this case, from animals to humans. The underlying principle here is to find a suitable animal donor for human heart transplantation due to the shortage of human donor hearts.
## **Why the Correct Answer is Right**
The correct answer, **C. Pig**, is right because pigs (swine) have been extensively studied and used in xenotransplantation research, particularly for heart transplantation. Pigs are considered suitable donors for several reasons: they have a similar heart size and physiology to humans, and their hearts can be genetically modified to reduce immune rejection. The use of pig hearts for human transplantation has shown promise in clinical trials, with some patients surviving for extended periods.
## **Why Each Wrong Option is Incorrect**
- **Option A: Rat** - Rats are not used for heart transplantation in humans due to significant size and physiological differences. They are commonly used in scientific research but not for xenotransplantation of hearts.
- **Option B: Rabbit** - Rabbits are also not used for heart transplantation in humans for similar reasons as rats; their heart size and physiology are not compatible with human requirements.
- **Option D: Chimpanzee** - While chimpanzees are genetically close to humans, their use in heart transplantation is not practical or ethical due to their intelligence, social behavior, and the risk of transmitting simian viruses to humans.
## **Clinical Pearl / High-Yield Fact**
A key point to remember is that genetic modification of pig hearts, such as through the use of **CRISPR/Cas9** to knockout the **Gal antigen**, has been a significant advancement in making pig hearts more compatible for human transplantation. This technique reduces hyperacute rejection and makes xenotransplantation a more viable option.
## **Correct Answer: C. Pig**