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CRL Quiz 3 Muscles 2

1

This question shows a comparison of two different muscle fibres. In fibre A, the sarcomeres are grouped HORIZONTALLY in SERIES in the direction of contraction. In fibre B, the sarcomeres are grouped VERTICALLY, perpendicular to contraction. Which fibre generates the greatest DEGREE OF SHORTENING?


  A

  B

  Same

2

The setup is the same as for question 1. Which fibre generates the HIGHEST VELOCITY?


  A

  B

  Same

3

The setup is the same as for question 1. Which fibre generates the HIGHEST MAXIMUM FORCE LEVEL?


  A

  B

  Same

4

The setup is the same as for question 1. Which fibre generates the GREATEST POWER?


  A

  B

  Same

5

How can you increase the 'velocity' of a muscle? (i.e. what structural feature can be changed?)


  Fibre types

  Cross-sectional area

  Length

  Nutrition Answer 1 if A, B and C are correct

6

"As muscle can generate contractile force over a wide range of lengths we can consider length to be a relatively minor determinant of muscle force." This statement is...


  True

  False


Explanation: Remember the length-tension relationship.

7

"Muscle itself does not feel pain." This statement is...


  True

  False

8

Which of the following are effectors of muscle mass?


  Nutrition

  Age

  Gender

  Efficient muscle repair Answer 1 if only A, B and C are correct

9

Which of the following are indicators of muscle injury?


  creatine kinase (CK) release from muscle

  increased muscle calcium influx

  decreased maximum force

  muscle soreness (humans)

  All of the above

10

What are the most important factors for efficient muscle repair following muscle damage?

1 myoblasts
2 satellite cells
3 intact basal lamina
4 sarcolemma
6 Inflammatory response


  All of the above

  1, 2 and 3

  2, 3 and 5