Neuromuscular Functions Flashcards Preview

Basis for Sports Physiology > Neuromuscular Functions > Flashcards

Flashcards in Neuromuscular Functions Deck (27):
1


Motor units are preferentially recruited following the Henneman size principle which means that large motorneurons are depolarized first.

True or False?

False

2

Under which of the following conditions does relaxation of the muscle occur?

when actin and myosin filaments return to their original states

3


With an isometric contraction, the muscle is able to overcome external resistance.

True or False

False

4


When lifting a constant load through a range of joint motion, the muscle is maximally contracted only at its weakest point in the range.

True of False?

True

5

A reflex arc involves:

Sensory stimuli sent to the central nervous system that sends out motor signals.

6

Individuals with the largest muscle cross-sections generate the most absolute force.

True or False

True

7

Which of the following bands widens in an eccentric action as the fibre lengthens during force generation?

A band

8

With endurance training there is a shift to higher ratios of Type I fibres and a reduction of Type IIA fibres.

True or False?

False

9

What is not a correct statement about the sliding-filament model of muscle contraction?

Actin crossbridges detach from the myosin filaments with energy from ATP hydrolysis

10

In certain instances, muscle fibres can be stimulated to stretch, rather than contract.

True or False?

False

11

High intensity exercise recruits predominantly slow-twitch motor units.

True or False?

False

12

A motorneuron consists of the cell body, several short dendritic fibres, and one long axon fibre that goes to skeletal muscle fibres.

True or False?

True

13

What is the term that represents a repeating pattern of two vesicles and a T-tubule in each Z region?

Triad

14

A motor unit contains only one specific muscle fibre type. Which of the following is not a muscle fibre type contained in a motor unit?

A. Type 1a
B. Type 1
C. Type 2
D. Type 2a

A. Type 1a

15

Eccentric contractions occur when:

A muscle lengthens during contraction.

16


There are two types of motor units which operate following the all-or-none law: one type consists of Type I fibres and the other of Type II.

True or False?

True

17

When a muscle contracts it always shortens.

True or False?

False

18


Muscle spindles are sensitive to both the rate of change in length as well as to the final length attained by the fibres.

True or False?

True

19

Muscle soreness can be prevented or reduced by what?

Stretching, and gradual increases in activity intensity.

20

What consists of the basic repeating unit between two Z lines and makes up the functional unit of the skeletal muscle?

sarcomere

21

What principle states that slow-twitch motor units with the lowest threshold for activation become selectively recruited during light-to-moderate effort?

size principle

22

Male and female athletes have?

The same fibre Type distribution and histochemical properties.

23

Muscle velocity and work output have a(n) ______ relationship.

inverse

24

The inhibitory action caused by what prevents actin-myosin interaction?

troponin

25

Which is the protein complex that is formed when crossbridges make contact with the actin filaments?

actomyosin complex

26


Longer muscle fibres exhibit a higher contractile velocity but a lower force-output capacity

True

27

What splits a phosphate from ATP and releases its stored mechanical energy as it straightens?

myosin