Myscular System Flashcards

0
Q

What are the three muscle types?

A

Skeletal striated muscle.
Cardiac striated muscle.
Smooth muscle.

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1
Q

What three things determine muscle tissue characteristics?

A

Whether it’s voluntary verse in voluntary.
Whether it striated vs. smooth or unstriated.
Whether it’s somatic vs. visceral.

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2
Q

What are the differences between the three muscle types?

A

Skeletal striated muscle:
voluntary somatic muscle, makes exoskeletal muscles, move and stabilize bones and other structures.

Cardiac striated muscle: involuntary visceral muscle, forms most of the walls of the heart and adjacent parts of the great vessels, pumps blood.

Smooth muscle:
involuntary visceral muscle, forms part of the walls of most vessels and hollow organs (viscera), moves substances through using coordinated sequential contractions (peristalsis)

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3
Q

What portions of the contractile skeletal muscle are fleshy and reddish?

A

Heads or bellies

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4
Q

White noncontractile portions composed mainly of organized collagen that provide a means of attachment?

A

Tendons

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5
Q

What is aponeurosis?

A

Flat sheet formed by some tendons that anchor the muscle to the skeleton and/or the fascia, May also anchor to the aponeurosis of another muscle.

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6
Q

What are the different classifications of muscles?

A

Flat, fusiform, pennate muscles, quadrate, circular or sphincteral, multi-headed or multi-bellied.

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7
Q

What are the different types of contraction of muscles?

A

Reflexive contraction, tonic contraction, phasic contraction.

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8
Q

What is an example of a reflex contraction?

A

Contraction of thoracic diaphragm is controlled reflexively by oxygen and carbon dioxide levels in blood. Can control this within limits.

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9
Q

Movement of a muscle after a stretch to tendon has been induced by tapping with the hammer?

A

Myotatic reflex

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10
Q

What is a tonic contraction and what are the causes of such a contraction? Or lack thereof?

A

Slight contraction present in muscles even when relaxed creating muscle tone.

Does not produce movement or active resistance.

Gives muscle a certain firmness to stabilize joints maintain posture.

Keeps muscles ready to respond.

Absent when a deep sleep, under anesthesia and after paralysis.

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11
Q

What are the two main types of phasic contraction?

A

Isometric and isotonic.

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12
Q

What is considered an isometric contraction? Give an example.

A

Muscle length remains the same or another words no movement occurs.
An example is maintaining upright posture.

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13
Q

Muscle changes length in relationship to production of this movement. What is this contraction type?

A

Isotonic contraction.

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14
Q

What are the two types of isotonic contractions? Briefly explain each one.

A

Concentric contraction is a movement that occurs as a result of muscle shortening.
Eccentric contraction is a lengthening of a contracting muscle. In this contraction a controlled and gradual relaxation occurs while continually exerting a diminishing force.

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15
Q

What are the different terms describing muscle function?

A

Prime mover or agonist, fixator, synergist, antagonist.

16
Q

What does a prime mover do?

A

Main muscle responsible for producing a specific movement, contracts concentrically to produce movement, usually a single prime mover, under certain circumstances gravity maybe prime mover.

17
Q

What is a fixator muscle do?

A

Steadies proximal parts of a limb.

It’s an isometric contraction in other words no shortening lengthening occurs.

18
Q

What does a synergist muscle do?

A

Complements actions of the prime mover which performs same movements as the prime mover and may act as a fixator of an intervening joint. This is a concentric contraction and usually has several synergist helping prim mover.

19
Q

What does an antagonist muscle do?

A

It opposes action of another muscle.
It is an eccentric contraction relaxing progressively to produce a smooth movement.
A primary antagonist directly opposes the prime mover. Secondary antagonist opposes synergists.

20
Q

In which plane does flexion and extension of a muscle occur and what is its axis?

A

Sagittal plane around a transverse axis.

21
Q

What plane and axis does adduction and abduction occur in?

A

In the frontal plane and around and anteroposterior axis.

22
Q

What classifies a circumduction action?

A

Any muscle performing all four movements such as sequential flexion, abduction, extension and adduction.

23
Q

What is radial/ulnar deviation?

A

Terms used for abduction and adduction at the wrist.