Animal organisation - transport systems - AQAHeart transplants

Multicellular organisms require transport systems to supply their cells and remove waste products. In humans, one of the functions of the circulatory system is to transport substances.

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Heart transplants

A is required in cases of . can lead to heart failure. The heart fails to pump sufficient blood and are starved of . There are different degrees of severity of heart failure.

A consultant assesses the patient's condition. If other treatments are not managing the heart condition, a transplant may be recommended and a patient will be put on a waiting list. A transplant puts major strain on the body, and the benefits and risks will be evaluated including whether the patient's condition is sufficiently severe and other health factors.

There is a shortage of donor hearts in the UK. Only around 200 transplants are carried out each year in a small number of hospitals.

Artificial hearts are plastic devices used occasionally to keep patients alive whilst waiting for a heart transplant. They can also be used to allow a patient's heart to rest to help it recover.

An illustration of an artificial heart

After the transplant, the patient will:

  • need time to heal, recover and build up strength
  • have to take drugs called for the rest of their life - this prevents the person's immune system from rejecting the donor heart
  • have an increased risk of infection because of these drugs