Neuromuscular Function Quiz

Question 1

Which of the following statements accurately describes the definitions of strength and power?

Answer 1

Strength is the maximum amount of force a muscle can exert in a single effort, while power is the time rate of doing work.

Question 2

Based on muscle architecture, which muscle is best suited for speed?

Answer 2

Bicep femoris

Question 3

A _______ physiological cross sectional area produces ______ force production

Answer 3

greater / greater

Question 4

The green line

Answer 4

Anatomical cross-sectional area

Question 5

What characteristics of hamstrings and dorsiflexors make them designed for velocity?

Answer 5

Sarcomeres arranged in series

Question 6

The force of graded muscle action varies from slight to maximal via two mechanisms:

Answer 6

Increased number of motor units recruited

Increased frequency of motor unit discharge

Question 7

What is the optimal sarcomere length for force generation in the length-tension relationship?

Answer 7

Resting length sarcomeres

Question 8

What does Rate of Force Development (RFD) during rapid contractions characterise?

Answer 8

Explosive Strength

Question 9

What characteristics of quadriceps and planter flexors make them designed for force production?

Answer 9

Larger pennation angles

Question 10

What occurs at muscle lengths longer than the optimal length?

Answer 10

Total tension may be greatest

Question 11

Which attribute does NOT directly explain the ‘time taken to reach % force’ in the rate of force development (RFD) test?

Answer 11

Muscle CSA

Question 12

Which of the following statements regarding maximum strength and Rate of Force Development (RFD) is correct?

Answer 12

RFD is better related to most performances of both sport-specific and functional daily tasks compared to maximal voluntary contraction strength.

Question 13

The frequency by which motor units are recruited is called

Answer 13

motor unit rate coding

Question 14

In large muscles (e.g. quadriceps) motor unit recruitment accounts for _____ % Fmax?

Answer 14

90%

Question 15

What distinguishes fast-twitch fibers from slow-twitch fibers in terms of force production and power?

Answer 15

Faster force build-up and higher force at maximum shortening velocities

Question 16

In the context of muscle contraction, what does Rate of Force Development (RFD) specifically refer to?

Answer 16

The ability to increase force as quickly as possible during a rapid contraction.

Question 17

Max velocity

Answer 17

When green and red meet 2nd time

Question 18

Which principle governs the ordered recruitment of motor units according to size and the force generated by a muscle, allowing for stepwise increases in force by progressive recruitment of motor units?

Answer 18

Henneman’s Law of Contraction

Question 19

According to the length-tension relationship, what is the optimal sarcomere length to generate maximal tension?

Answer 19

2.0 – 2.2 mm

Question 20

Muscle fiber tension in response to a single electrical impulse describes what type of contraction?

Answer 20

Twitch

Question 21

Maximum Power occurs at ___ max velocity in the force-velocity relationship, with power being calculated as the product of force and velocity.

Answer 21

1/3

Question 22

Fast twitch muscle fibers exhibit ____ shortening speeds and are up to _____ times more powerful that slow twitch muscle fibers

Answer 22

fast / eight

Question 23

What determines the force or tension produced by a whole skeletal muscle?

Answer 23

Number of motor units and their recruitment frequency

Question 24

Which muscle group is likely designed for force production based on the given characteristics?

Answer 24

Quadriceps and planter flexors

Question 25

What is the composition of a motor unit?

Answer 25

Multiple muscle fibers and a motor neuron

Question 26

Which of the following characteristics does NOT describe a pennate muscle?

Answer 26

They shorten at a faster rate

Question 27

Rate of force development is influenced by

Answer 27

muscular strength muscle cross sectional area fibre type composition muscle tendon stiffness

Question 28

Based on muscle architecture, which muscle is best suited for strength?

Answer 28

Quadriceps

Question 29

In large muscles motor unit recruitment accounts for ______ % maximal force

Answer 29

90%

Question 30

The extent to which motor unit (MU) rate coding and recruitment are used varies with different muscles. The force of which muscle is explained by this rate coding and recruitment relationship?

Answer 30

Adductor Pollicis

Question 31

Which statement accurately describes characteristics of small and large motor units?

Answer 31

Small motor units are easily recruited and fatigue-resistant, suitable for prolonged daily activities, while large motor units are less easily recruited and rapidly fatigable, suitable for high-force contractions.

Question 32

Maximum voluntary contractions are a standard method to measure

Answer 32

muscle strength

Question 33

How does an increase in the number of motor units recruited affect electromyography (EMG)?

Answer 33

Increases amplitude