MSCE Biology for Form 4: Master Key Concepts

 

  • Overview: Involves transplanting organs from a donor to a recipient to replace damaged organs.

Organ Transplant

  • Definition: The replacement of damaged tissues or organs in humans with healthy ones from a donor.

Graft

  • Definition: A part of tissue or organ that is transplanted from a donor to a recipient.

Transplantable Parts

  • Skin, eyes, heart, spleen, liver, kidneys, reproductive organs.
  • Procedure: A tissue or organ from a donor is severed and transplanted onto a properly prepared surface of the recipient.

Factors to Consider Before Organ Transplant

  1. Compatibility
  • Genetic Closeness: The donor and recipient should be closely related and of the same species.
  1. Antibody and Antigen Compatibility
  • Avoid antigen-antibody reactions to prevent rejection.
  1. Drug
  • Use drugs to prevent rejection without significantly affecting the recipient’s immune system.
  1. Blood Group
  • The donor and recipient should have the same blood group to avoid agglutination (clumping).
  1. Nutritional Status
  • Ensure adequate protein intake to support healing in the recipient.
  1. Consent
  • Obtain consent from the willing donor and their close relatives.
  1. Availability of Immune Suppressive Drugs
  • Examples: Immunosuppressants like cyclosporine, corticosteroids.
  • These drugs help prevent rejection but should not overly suppress the recipient’s immune system.
  1. Assessment of Health Status
  • Evaluate the mental, physical, psychological, and overall health of both the donor and recipient to minimize side effects.

Examples of Organ Transplants

  1. Heart Transplant
    • Procedure: Replace a failing heart with a donor heart.
    • Steps: Remove the donor heart, divide it if needed, and attach the blood vessels to the recipient’s heart.
  2. Skin Transplant
    • Considerations: The graft must match the recipient in texture and color.
    • Procedure: Ensure a proper blood supply and sterilize the surface to prevent infection.
  3. Kidney Transplant
    • Procedure: Remove a kidney from a donor and transplant it to the recipient.
    • Considerations: Donor should be a close relative with compatible tissue.
    • Drugs: Use immunosuppressants like interferon, prednisone, and azathioprine.
    • Type: The graft is called an autograft if from the same individual.
  4. Cornea Transplant
    • Procedure: Replace damaged corneal tissue with healthy donor tissue.
    • Purpose: To improve sight, relieve pain, or treat severe damage or infection.
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