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Kines 360 > Test 3.0 > Flashcards

Test 3.0 Flashcards

1
Q

How many motor neurons innervate a muscle cell and how many muscle cells innervate a motor neuron

A

One motor neuron can innervate one or more muscle cell but no muscle cell will innervate more than one motor neuron

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2
Q

Yes or No

If you have a low ratio of motor neuron to muscle cell is that motor unit going to generate a lot of force

A

No

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3
Q

True or false

The smaller the innervation ratio the smaller the force you can generate by command

A

True

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4
Q

Where do you have a high innervation ratio

A

Within large muscles like Quads, Hamstrings, and biceps

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5
Q

What is dorsal root for

A

Sensory input

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6
Q

What is the ventral root for

A

Motor output

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7
Q

What type of cells are responsible for muscle movement

A

Alpha motor neurons

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8
Q

What does the Gamga motor neurons do

A

Regulate sensory information

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9
Q

Motor lateral in the spinal cord which are alpha motor neurons innervate medal or distal muscles

A

Distal muscles

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10
Q

Motor medial spinal cord innervate distal or medial muscles

A

Medial muscles

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11
Q

Is aerobic eve rise for a short or long period of time

A

Long

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12
Q

Is anaerobic exercise for short or long time

A

Short

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13
Q

What does Oxidative Phosphorylation use

A

Fatty acid and lots to ATP

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14
Q

Where is ATP generated from

A

Glucose

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15
Q

Does anaerobic require oxygen

A

No

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16
Q

How many different types of motor units are their

A

Three

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17
Q

The faster the motor unit the ________ the force it creates

A

Higher

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18
Q

Does fast or slow twitch rely on oxygen

A

Slow twitch

19
Q

What are low frequencies related to

A

Single twitch of the related muscle fibers

20
Q

What is high frequencies related to

A

Twitches some to produce a larger force

21
Q

What is the higher frequencies related to

A

Force produce is greater but individual twitches are still apparent

22
Q

Do slow motor neurons have a thin or thick axon

A

Thin

23
Q

Do fast motor neurons have a thin or thick axon

A

Thick

24
Q

What are highest frequencies related to

A

Individual twitches are no longer apparent

25
Q

Which molecule is needed to generate more force

A

Calcium

26
Q

What is thin filament associated with and what does it attach to

A

Actin and attaches to myosin

27
Q

What is thick filament associated with and what does it attach to

A

Myosin and attached to actin

28
Q

Does slow force units use high or low frequencies

A

High

29
Q

Does faster force units use fast or slow frequencies

A

Slow

30
Q

When you release Ach what happens

A

You get activation causing opening of Na+ channels causing excitatory response leading to depolarization

31
Q

Where does a muscle cell have a high concentration or K+ and a low concentration of Na+

A

High K+ inside cell

High Na+ outside cell

32
Q

True or false

Eccentric force is greater than isometric

A

True

33
Q

True or false

Isometric force is weaker than concentric

A

False it is greater

34
Q

What is needed for muscle contraction

A

ATP and calcium

35
Q

Can you contract a muscle by depolarization or hyperpolarization

A

Depolarization

36
Q

What are the steps that are apart of the Sliding filament theory

A

1) detachment of myosin from actin (ATP needed)
2) attachment of myosin to binding site on actin
3) movement of myosin (power stroke
4) detachment of myosin from actin

37
Q

What is Titin molecule for

A

Holds myosin filament at each end of the sacromere

38
Q

What does the sacromere do

A

Has lots of myosin and actin

39
Q

If a muscle is short or long and you stimulate it will you get a force generated

A

No

40
Q

The force generated in a muscle is proportional to what?

A

The number of crossbridges

41
Q

What is the optimal resting length

A

Is the maximal amount of crossbridges formed

42
Q

As you lengthen the muscle will you increase or decrease force

A

Increase

43
Q

What is a motor unit

A

Is the motor neuron and muscle cell it innervates

Kines 360 (9 decks)

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