Through the miracles of medicine and technology, researchers have had some success with growing and transplanting hollow, relatively simple organs such as tracheas and bladders. Building organs like the heart and lungs have proved to be much more difficult.

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Doctors have had luck transplanting hearts and lungs. But science has not been very successful in growing hearts and lungs. Why?



A) They contain nerves and scientists cannot grow nerve cells.


B) They are complex organs made of many types of cells and tissues.


C) Even if researchers build a heart or lung, there is no guarantee that a person's body will accept it. ****


D) Human hearts and lungs are not like any other animal organs so there is not source for cells and tissues.

someone plz?

its b

The correct answer is B) They are complex organs made of many types of cells and tissues.

To understand why building and growing hearts and lungs have proved to be more difficult, it's important to recognize the complexity of these organs. The heart, for example, is a highly intricate organ composed of various types of cells such as cardiomyocytes, endothelial cells, and fibroblasts, among others. Similarly, lungs consist of complex structures like alveoli, bronchioles, and blood vessels.

The challenge lies in recreating the intricate architecture and functionality of these organs. It is not simply a matter of growing a mass of cells. The cells need to be organized in a specific way and work together to perform their respective functions. Additionally, organs like the heart and lungs require precise connections to nerves, blood vessels, and other tissues, further adding to the complexity.

Furthermore, there is the issue of immune rejection. Even if researchers are successful in building or growing a heart or lung, there is no guarantee that a person's body will accept it. The human immune system can recognize foreign tissues and organs as "non-self" and mount an immune response against them, potentially leading to organ rejection.

While the field of regenerative medicine is making significant advancements, building and growing complex organs like the heart and lungs still pose significant challenges due to their intricate nature and the potential for immune rejection. Scientists continue to explore various approaches, including tissue engineering and stem cell research, in hopes of overcoming these hurdles and achieving successful transplantation or regeneration of these vital organs.

C) Even if researchers build a heart or lung, there is no guarantee that a person's body will accept it.

I did it on usatestprep and the answer it says on usatestprep is

D) Human hearts and lungs are not like any other animal organs so there is not source for cells and tissues.