Chapter 10- Muscle Tissue Flashcards Preview

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Flashcards in Chapter 10- Muscle Tissue Deck (53)
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Muscle tissue consists of cells that are highly specialized for the...

1. Excitability
2. Contraction
3. Maintain body temperature

1

The primary functions performed by skeletal muscles are to...

1. Produce skeletal movement
2. Guard entrances and exits
3. Maintain body temperature

2

Skeletal muscles move the body by...

Pulling on the bones of the skeleton

3

Skeletal muscles are often called voluntary muscles because...

They contract only when stimulated by motor neurons of the central nervous system

4

The three layers of connective tissue supporting each muscle are the...

Epimysium, perimysium, and endomysium

5

Nerves and blood vessels that supply the muscle fibers are contained within the connective tissues of the...

Endomysium and perimysium

6

The smallest functional unit of the muscle fiber is...

The sarcomere

7

The thin filaments consist of...

Pair of protein strands wound together to form chains of actin molecules

8

The thick filaments consist of...

Helical array of myosin molecules

9

The sliding filament theory explains that the physical change that takes place during contraction is the...

Thin filaments are sliding toward the center of the sarcomere alongside the thick filaments

10

Troponin and tropomyosin are two proteins that can prevent the contractile process by...

Covering the active site and blocking the actin-myosin interaction

11

The first step in excitation-contraction coupling is the...

Stimulation of the sarcolemma

12

Muscle relaxation begins with...

Breakdown of ACh by AChE

13

All of the muscle fibers controlled by a single motor neuron constitute a...

Motor unit

14

The tension in a muscle fiber will vary depending on the...

1. Structure of individual sarcomeres
2. Initial length of muscle fibers
3. Number of cross bridge interactions within a muscle fiber

15

There is less precise control over leg muscles compared to the muscles of the eye because...

Many muscle fibers are controlled by a single motor neuron

16

Skeletal muscle fibers contract most forcefully when stimulated over a...

Narrow range of resting lengths

17

The amount of tension produced by a skeletal muscle is controlled by...

The total number of muscle fibers stimulated

18

Peak tension production occurs when all motor units in the muscle contract in a state of...

Complete tetanus

19

In a concentric isotonic contraction...

The cross bridges must produce enough tension to overcome the resistance

20

In an isometric contraction...

Tension rises but the length of the muscle remains constant

21

A high blood concentration of the enzyme creatine kinase usually indicates...

Serious muscle damage

22

Mitochondrial activities are relatively efficient, but their rate of ATP generation is limited by the...

Availability of oxygen

23

What has been correlated with muscle fatigue?

A decline of pH within the muscle, altering enzyme activities

24

During the recovery period, the body's oxygen demand is...

Elevated above normal resting levels

25

The three major types of skeletal muscle fibers in the human body are...

Slow, intermediate, fast

26

Extensive blood vessels, mitochondria, and myoglobin are found in the greatest concentration in...

Slow fibers

27

The length of time a muscle can continue to contract while supported by mitochondrial activities is referred to as...

Aerobic endurance

28

Altering the characteristics of muscle fibers and improving the performance of the cardiovascular system results in improving...

Aerobic endurance

29

The property of cardiac muscle that allows it to contract without neural stimulation is...

Automaticity