Question

1. based on the data provided in the table, which material provides the best balance of durability and low rejection risk?

(1) a valve made from biologically derived bovine tissue, offering low rejection risk but limited durability that may require replacement within a shorter time frame.
(2) a valve made from high - strength titanium alloy, providing excellent durability but posing a risk of immune rejection due to prolonged exposure to blood.
(3) a 3d - printed polymer scaffold offering medium - to - high durability and a consistently low chance of triggering immune rejection.
(4) none of the materials listed in the table offer both high durability and low rejection risk, so the engineering team must consider developing a new option.

1. using the evidence provided, explain how the structure of the artificial valve allows it to perform the same function as a natural heart valve. include one trade - off involved in selecting the polymer scaffold as the valve material. 1

1. which factor would be most important to consider when comparing two heart valve materials for long - term use in people?

(1) whether the valve can be made in different colors to match nearby tissue for demonstration during surgery.
(2) the average time it takes surgeons to implant each valve, since shorter surgeries reduce the use of hospital resources.
(3) the ability of the material to maintain one - way blood flow for many years without causing immune rejection or needing replacement.
(4) how quickly the valve breaks down after removal, which may affect how biodegradable the material is once discarded.

Explanation:

Question 10

To determine the best balance of durability and low rejection risk, we analyze each option:

1. Option 1: Low rejection risk but limited durability (needs replacement soon) – not a good balance.
2. Option 2: Excellent durability but high immune rejection risk – not a good balance.
3. Option 3: Medium - to - high durability and consistently low rejection risk – this seems to offer a good balance of both factors.
4. Option 4: States none offer both, but Option 3 does have a balance, so this is incorrect.

For long - term use of a heart valve in people, we need to consider factors related to the valve's functionality over time.

1. Option 1: Valve color for surgical demonstration is not relevant for long - term use.
2. Option 2: Surgery time affects hospital resources but not the long - term performance of the valve in the patient.
3. Option 3: The ability to maintain one - way blood flow for many years without immune rejection or replacement is crucial for long - term use as it ensures the valve functions properly and the patient doesn't need frequent interventions.
4. Option 4: Degradation after removal (biodegradability) is not relevant to the valve's performance while it's in the patient for long - term use.

Answer:

(3) A 3D - printed polymer scaffold offering medium - to - high durability and a consistently low chance of triggering immune rejection.

Question 12