Anatomy of skeletal Muscle

0.0(0)
studied byStudied by 0 people
learnLearn
examPractice Test
spaced repetitionSpaced Repetition
heart puzzleMatch
flashcardsFlashcards
Card Sorting

1/51

encourage image

There's no tags or description

Looks like no tags are added yet.

Study Analytics
Name
Mastery
Learn
Test
Matching
Spaced

No study sessions yet.

52 Terms

1
New cards

what is the fascia of skeletal muscle

a thin sheath of fibrous tissue enclosing a muscle or other organ

<p>a thin sheath of fibrous tissue enclosing a muscle or other organ</p>
2
New cards

What is the epimysium?

surrounds entire muscle

<p>surrounds entire muscle</p>
3
New cards

What is a muscle fasicle

bundle of skeletal muscle fibers ( cells )

<p>bundle of skeletal muscle fibers ( cells )</p>
4
New cards

What is the perimysium

The connective tissue that surrounds fascicles.

<p>The connective tissue that surrounds fascicles.</p>
5
New cards

What is a muscle fiber

muscle cell

<p>muscle cell</p>
6
New cards

What is a endomysium

a thin layer of connective tissue that surrounds each muscle fiber

<p>a thin layer of connective tissue that surrounds each muscle fiber</p>
7
New cards

What. is a myofibril

Many of these units make up a single muscle fiber. These are made up of sarcomeres.

<p>Many of these units make up a single muscle fiber. These are made up of sarcomeres.</p>
8
New cards

What is a sarcomere

contractile unit of a muscle fiber

<p>contractile unit of a muscle fiber</p>
9
New cards

What is actin

This term refers to a thin protein filament that acts with myosin filaments to produce muscle action.

<p>This term refers to a thin protein filament that acts with myosin filaments to produce muscle action.</p>
10
New cards

What is myosin

thick filaments

<p>thick filaments</p>
11
New cards

What is tropomyosin?

It is a long, fibrous protein that winds around the actin polymer, blocking all the myosin-binding sites.

<p>It is a long, fibrous protein that winds around the actin polymer, blocking all the myosin-binding sites.</p>
12
New cards

What. is troponin

a regulatory protein that moves tropomyosin aside & exposes myosin binding sites when Ca+ is released during muscle contraction

<p>a regulatory protein that moves tropomyosin aside &amp; exposes myosin binding sites when Ca+ is released during muscle contraction</p>
13
New cards

What effect does calcium have on troponin

binds to troponin and removes it from the active site that is covered by tropomyosin

<p>binds to troponin and removes it from the active site that is covered by tropomyosin</p>
14
New cards

ligand-gated ion channel

Type of membrane receptor that has a region that can act as a "gate" when the receptor changes shape.

<p>Type of membrane receptor that has a region that can act as a "gate" when the receptor changes shape.</p>
15
New cards

voltage-gated ion channels

Channels that open or close in response to a change in the membrane potential.

<p>Channels that open or close in response to a change in the membrane potential.</p>
16
New cards

What is a resting membrane potential

Difference in electrical charge across the membrane at rest

<p>Difference in electrical charge across the membrane at rest</p>
17
New cards

What is the threshold potential?

the critical level to which a membrane potential must be depolarized to initiate an action potential

<p>the critical level to which a membrane potential must be depolarized to initiate an action potential</p>
18
New cards

What is depolarization

This term refers to when any time the charge difference becomes more positive than the RPM of - 70mV. moving closer to zero.

<p>This term refers to when any time the charge difference becomes more positive than the RPM of - 70mV. moving closer to zero.</p>
19
New cards

What is repolarization

the membrane returns to its resting membrane potential

<p>the membrane returns to its resting membrane potential</p>
20
New cards

What is an action potential

electrical impulse that travels down the axon triggering the release of neurotransmitters

<p>electrical impulse that travels down the axon triggering the release of neurotransmitters</p>
21
New cards

What are the T tubules in skeletal muscle

invaginations (folded in sections) of cell membrane that dive into the core to carry the action potential of the cell membrane internally to contact the terminal cisternae of 2 adjacent lengths of sacroplasmic reticulum - this creates a TRIAD

<p>invaginations (folded in sections) of cell membrane that dive into the core to carry the action potential of the cell membrane internally to contact the terminal cisternae of 2 adjacent lengths of sacroplasmic reticulum - this creates a TRIAD</p>
22
New cards

What is stored in the Cisternae

Calcium

23
New cards

What causes the globubar head to go into a cock position

hydrolysis of ATP , ADP AND. P attach to the globular head

24
New cards

What is the H zone

myosin only

<p>myosin only</p>
25
New cards

What is the A band a sarcomere

The entire length of the myosin filament. Contains myosin and actin

<p>The entire length of the myosin filament. Contains myosin and actin</p>
26
New cards

'what is the I band

actin only

<p>actin only</p>
27
New cards

depolarization phase

sodium channels open

<p>sodium channels open</p>
28
New cards

repolarization phase

sodium channels close and potassium channels open

<p>sodium channels close and potassium channels open</p>
29
New cards

muscle contraction in sarcomere

knowt flashcard image
30
New cards

letter. a

What letter is the muscle facia

<p>What letter is the muscle facia</p>
31
New cards

What letter is the muscle fascicle?

<p>What letter is the muscle fascicle?</p>
32
New cards

Grip Strength

Force exerted by hand during gripping.

<p>Force exerted by hand during gripping.</p>
33
New cards

Grip strength

C7, C8, T1

<p>C7, C8, T1</p>
34
New cards

muscle twitch

a motor unit's response to a single action potential of its motor neuron

<p>a motor unit's response to a single action potential of its motor neuron</p>
35
New cards

latent period

time between application of a stimulus and the beginning of a response in a muscle fiber

36
New cards

relaxation period

during this time, calcium ions are actively transported back into the sarcoplasmic reticulum, myosin-binding sites are covered by tropomyosin, myosin heads detach from actin, and tension in the muscle fiber decreases

37
New cards

What is the role of ATP in muscle contraction

ATP attaches to myosin which allows the cross bridge cycle to begin which allows muscle contraction to occur

<p>ATP attaches to myosin which allows the cross bridge cycle to begin which allows muscle contraction to occur</p>
38
New cards

What causes the power stroke

release of ADP and Pi

(the hydrolysis of ATP provides the energy for the power stroke. Energy is transferred from ATP to the myosin head.)

<p>release of ADP and Pi</p><p>(the hydrolysis of ATP provides the energy for the power stroke. Energy is transferred from ATP to the myosin head.)</p>
39
New cards

What is the refractory period

a period immediately following stimulation during which a nerve or muscle is unresponsive to further stimulation.

<p>a period immediately following stimulation during which a nerve or muscle is unresponsive to further stimulation.</p>
40
New cards

muscle tension

Force exerted by a contracting muscle.

<p>Force exerted by a contracting muscle.</p>
41
New cards

what is wave summation

When a muscle receives a 2nd stimulus before the 1st is complete,

the contraction will be stronger.

<p>When a muscle receives a 2nd stimulus before the 1st is complete,</p><p>the contraction will be stronger.</p>
42
New cards

unfused tetanus

type of wave summation with partial relaxation observed between twitches

<p>type of wave summation with partial relaxation observed between twitches</p>
43
New cards

fused tetanus

when stimulus frequency is so high that no muscle relaxation takes place between stimuli

<p>when stimulus frequency is so high that no muscle relaxation takes place between stimuli</p>
44
New cards

optimal length of a sarcomere

lots of actin-myosin overlap and plenty of room to slide

<p>lots of actin-myosin overlap and plenty of room to slide</p>
45
New cards

length - tension relationship

resting length of a muscle and the tension it can produce at that length

<p>resting length of a muscle and the tension it can produce at that length</p>
46
New cards

type I muscle

Slow twitch muscle fibers that are efficient at using oxygen to generate fuel (Aerobic). Continuous contractions for longer sustainable exercise, such as cycling, hiking, distance running.

<p>Slow twitch muscle fibers that are efficient at using oxygen to generate fuel (Aerobic). Continuous contractions for longer sustainable exercise, such as cycling, hiking, distance running.</p>
47
New cards

Type II muscle fibers

Muscle fibers that are larger in size, generate higher amounts of force, and are faster to fatigue.

<p>Muscle fibers that are larger in size, generate higher amounts of force, and are faster to fatigue.</p>
48
New cards

muscle recruitment

increase in the # of motor units being used to increase strength of contraction

<p>increase in the # of motor units being used to increase strength of contraction</p>
49
New cards

muscle tone

the state of balanced muscle tension that makes normal posture, coordination, and movement possible

<p>the state of balanced muscle tension that makes normal posture, coordination, and movement possible</p>
50
New cards

isometric

same length, changing tension

<p>same length, changing tension</p>
51
New cards

isotonic muscle contraction

muscle changes in length with no change in tension

<p>muscle changes in length with no change in tension</p>
52
New cards

isokinetic muscle movement

Muscle contractions without resistance. Resistance is provided at a constant rate by an external devise.

Ex: Rehabilitative exercises for knee and elbow injuries and lifting weights.

<p>Muscle contractions without resistance. Resistance is provided at a constant rate by an external devise.</p><p>Ex: Rehabilitative exercises for knee and elbow injuries and lifting weights.</p>