Lesson 3: Muscle Physiology Flashcards Preview

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Flashcards in Lesson 3: Muscle Physiology Deck (29)
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1

The Muscular system is comprised of three types of muscle tissue:

Skeletal
Cardiac
Smooth

2

A muscle fiber is either in a state of producing maximum tension or not producing any tension at all; this is known as the "____ ____ _____" principle.

All or nothing

3

Cylindrical structures containing the myofilaments actin and myosin.

Myofibrils

4

Thin myofilaments

Actin

5

Thick myofilaments

Myosin

6

Wave-like changes in the electrical properties of a cell membrane.

Action potential

7

Striated muscle used the facilitate movement.

Skeletal muscle

8

Acts as a storage site for calcium

Sarcoplasmic reticulum

9

_________ firing - employed during high-output demands involving fast twitch fibers and warranting significant fiber recruitment.

Synchronized

10

_________ firing - employed during endurance activities involving slow twitch fibers which conserve motor unit potential, allowing prolonged work

Asynchronized

11

The ability to increase force production within a muscle through training is dependant on adaptions that occur to both: _______ and ________

Muscle Fibers (size)
The Nervous System

12

List 3 ways in which the nervous systems allows for improvements in force production within muscle.

Increased Firing Rate
increased Recruitment
Increased Synchronicity

13

_______ contractions - involve lengthening or shortening of a working muscle.

Isotonic

14

_______ contraction - Muscle lengthens; negative work is produced; movement is decelerated

Eccentric

15

_______ contraction - Muscle shortens; positive work is produced; movement is accelerated.

Concentric

16

_______ contractions - Mostly used for stability, represents tensions in the muscle that helps maintain a stable position

Isometric

17

Oxygen- transporting protein of muscle.

Myogoblin

18

Muscle found exclusively within the heart.

Cardiac Muscle

19

Muscle found within the "walls" of hollow organs.

Smooth Muscle

20

Period of time between repeated actions in an exercise; energy system specific and based on physical condition.

Rest Interval or Rest Period

21

Period of time between exercise bouts.

Recovery Period

22

Low force-producing fibers, or slow oxidative fibers.

Type 1

23

Intermediate force-producing fibers, or fast oxidative/glycolytic fibers.

Type 2a

24

High force-producing fibers, or fast glycolytic fibers.

Type 2b

25

Postural muscles maintain a higher concentration of ____- twitch fibers.

Slow

26

Some motor units in a muscle are always active even when the muscle is not contracting.

Muscle tone

27

Intrafusal fibers that lie parallel to normal muscle fibers which relay information to sensory neurons regarding changes in tissue length.

Muscle Spindles
Note: When Rapidly Stretched , they respond with a stretch reflex to initiate a contraction that limits an overstretch and potential damage to the muscle.

28

Sensory receptors found within muscle tendons that communicate information to motor neurons regarding the presence of excessive tension that may cause damage.

Golgi tendon organs

29

Muscle fibers can become better suited to a specific training stimulus due to the following 3 adaptions.

Neural Stimulation
Capillary and Mitochondrial density
Enzyme concentration