Why Are Red Blood Cell Transfusions Not Rejected in the Same

question 8

Multiple Choice

Why are red blood cell transfusions not rejected in the same way that transplanted tissues are?

• A)MHC Class II molecules are unstable on red blood cells once they are removed from the body.
• B)Mature red blood cells do not express MHC Class II.
• C)Mature red blood cells do not express MHC Class I.
• D)Refrigerator storage of red blood cells inactivates both MHC Class II and I.
• E)MHC Class I molecules are unstable on red blood cells once they are removed from the body.

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Definitions:

Simultaneous Conditioning

A classical conditioning method where both the conditioned and unconditioned stimuli are presented at the same time.

Backward Conditioning

A conditioning process where a stimulus that normally elicits a response is presented after the response, instead of before it, which can result in weakened associative learning.

Trace Conditioning

A type of classical conditioning where the conditioned stimulus (CS) and unconditioned stimulus (US) are separated by a time interval, requiring the organism to maintain a mental representation of the CS to elicit a response.

Delayed Conditioning

A classical conditioning process where the conditioned stimulus begins before the unconditioned stimulus and continues until the unconditioned stimulus starts, facilitating the association between the two.