Designer Muscles: In this activity, you play the part of a mad scientist who wil

Question

Designer Muscles:  In this activity, you play the part of a mad scientist who will genetically re-engineer one of the common human muscle types, changing a feature to give it the desired characteristic.

For each question, you’ll be given one of the standard human muscle types, then one functional difference the new muscle you’re designing must have.  You indicate one structural difference between the standard and the new type that will create the desired feature in the new type. For example, if the question was “Gut smooth muscle, but more red” an answer would be “more myoglobin”. Sometimes multiple answers are possible; you need to give only one unless told otherwise.

1.          Cardiac muscle, but its rate never changes.

2.          Skeletal muscle, but always does synchronous recruitment; never asynchronous.

3.          Skeletal muscle, but better at exerting force when very stretched.

4.          Slow twitch skeletal muscle, but more powerful.

5.          Smooth muscle, but can not experience tetany.

6.          Smooth muscle, but more powerful. Choose a feature that is notinvolved with ATP production.

7.          Smooth muscle, but better at bringing in oxygen and having it available at all times.

Explanation / Answer

Answer 1. Rate never changes due to presence of pacemaker cells of SA node that present near right auricle.

Answer 2. Always does synchronise recruitment because skeletal muscle consists many motor unit and muscle

fibres those work integratively for effective contraction of muscle.

Answer 3. Due to shortening of sarcomeres and myofibrils become rich in calcium.

Answer 4. Slow twitch muscle are more powerful because it has capacity to produce energy self and sustain it for

long period.

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