Contraction Of A Muscle

Question 1

Ability to shorten when an adequate stimulus is shortened

Answer 1

Contractility

Question 2

Ability of muscle cells to be stretched

Answer 2

Extensibility

Question 3

Ability to recoil and resume resting length after stretching

Answer 3

Elasticity

Question 4

Stimulates skeletal muscles to contract

Answer 4

Motor neuron

Question 5

What is a motor unit

Answer 5

One motor neuron and all the skeletal muscle cells stimulated by that neuron

Question 6

A long, thread like extension of the neuron

Answer 6

Axon

Question 7

When does the axon branch into axon terminal

Answer 7

The axon reaches the muscle and it forms a junction with the Sacrolemma

Question 8

Where the axon terminal meets the sarcolemma

Answer 8

Neuromuscular joint

Question 9

What is the neurotransmitter chemical

Answer 9

Acetylcholine

Question 10

What is the synaptic cleft

Answer 10

Between the nerve and muscle

Question 11

What is the nerve and muscle area between them filled with

Answer 11

Interstitial fluid

Question 12

Chemical released by nerve upon arrival of nerve impulse and the axon terminal

Answer 12

Neurotransmitter

Question 13

First step

Answer 13

Action potential reaches the axon terminal of the motor neuron

Question 14

Second step

Answer 14

Calcium channels open and calcium Ions enter the axon terminal

Question 15

3rd step

Answer 15

Because the calcium ions enter it causes some synaptic vesicles to release their contents (acetylcholine) by exocytosis

Question 16

4th step

Answer 16

Acetylcholine diffuses across the synaptic cleft and binds to receptors in the sarcolemma

Question 17

Ability to receive and respond to a stimulus

Answer 17

excitability

Question 18

6th step

Answer 18

ACh effects our ended by it’s breakdown in the synaptic cleft by the enzyme acetylcholinesterastase

Question 19

The sliding filament Theory of muscle contraction

Answer 19

Activation by nerve causes myosin heads to attach to binding sites on the thin filament
myosin heads then bind to the next site of thin filaments and then pull them towards the center of the sarcomere

Question 20

Different degrees of skeletal muscle shortening

Answer 20

Graded responses

Question 21

What produces graded responses

Answer 21

The frequency of muscle stimulation and the number of muscle cells being stimulated

Question 22

Single brief jerky contraction

Answer 22

Twitch

Question 23

What is a summing of contractions

Answer 23

Contraction is immediately followed by another

Question 24

Does a muscle go completely back to resting position in summing of contractions

Answer 24

Oh no do to more frequent stimulations

Question 25

What is unfused tetanus

Answer 25

Some relaxation occurs between contractions

Question 26

Which has nerve stimuli arrive at the faster rate unfused tetanus or something of contractions

Answer 26

Unfused tetanus

Question 27

What is fuse tetanus

Answer 27

No evidence of relaxation before the following construction

Question 28

Why is there no relaxation between contractions infused tetanus

Answer 28

The frequency of stipulations is so high

Question 29

What determines muscle force

Answer 29

Number of fiber stimulated

Question 30

When do muscles stop contracting

Answer 30

run out of energy

Question 31

Initially muscles use what energy

Answer 31

Stored ATP

Question 32

What happened to ATP to release energy

Answer 32

Bonds are broken

Question 33

Much energy comes from stored in ATP

Answer 33

4-6 seconds

Question 34

Phosphorylation

Answer 34

Add a creatine phosphate to ADP to regenerate ATP

Question 35

I'm how long does it take CP supplies to be exhausted

Answer 35

15 seconds

Question 36

What is aerobic respiration

Answer 36

Loukos is broken down to carbon dioxide water and releases energy

Question 37

How much energy is released in aerobic respiration

Answer 37

32 ATP

Question 38

What is anaerobic glycolysis

Answer 38

Reaction that breaks down glucose without oxygen

Question 39

In anaerobic glycolysis glucose is broken down into what

Answer 39

Pyruvic acid and produces about two ATP

Question 40

Pyruvic acid is transferred into

Answer 40

Lactic acid

Question 41

What produces muscle fatigue

Answer 41

Lactic acid

Question 42

What is a common cause for muscle fatigue

Answer 42

Oxygen debt

Question 43

What is needed to get rid of lactic acid

Answer 43

Oxygen

Question 44

Myofilaments are able to slide past each other during contractions Able to shorten and move

Answer 44

Isotonic

Question 45

Tension in the muscle increases and no movement

Answer 45

Isometric

Question 46

Which type of exercise results and stronger more flexible muscles with greater resistance to fatigue

Answer 46

Aerobic exercise

Question 47

Type of exercise increases muscle size and strength

Answer 47

Resistance exercise

Question 48

5th step

Answer 48

channels to open that allows both sodium to enter the muscle and potassium to leave Depolarization also occurs which is the electrical impulse that comes from more sodium entering then potassium leaving, which causes action potential