Question

2 multiple choice 1 point which of the following statements is correct? the number of muscle fibers best determines how powerful a muscle will be the more a muscle shortens, the more power it generates. multipennate muscles do not produce much power because the fibers run in many directions. muscle fibers running in parallel arrangement generate more power. 3 multiple choice 1 point which type of lever is exemplified by the flexing of the forearm by the biceps brachii muscle? a first - class lever a second - class lever a third - class lever a fourth - class lever

Explanation:

• Question 2:
• The number of muscle fibers is a key determinant of muscle power. Muscles with more muscle fibers can generate more force.
• The power of a muscle is not simply related to how much it shortens. There are other factors like the velocity - force relationship.
• Multipennate muscles actually can produce a large amount of power because they have a large number of muscle fibers arranged in a way that can generate significant force.
• Muscle fibers running in parallel arrangement do not necessarily generate more power. It depends on factors like the cross - sectional area of the muscle (which is related to the number of fibers).
• Question 3:
• In a third - class lever, the effort is applied between the fulcrum and the load. When the biceps brachii muscle flexes the forearm, the elbow joint is the fulcrum, the biceps muscle (effort) is applied between the elbow (fulcrum) and the hand (load).
• In a first - class lever, the fulcrum is between the effort and the load (e.g., seesaw).
• In a second - class lever, the load is between the fulcrum and the effort (e.g., wheelbarrow).
• There is no fourth - class lever in the standard lever classification.

Answer:

• Question 2: The number of muscle fibers best determines how powerful a muscle will be.
• Question 3: a third - class lever.