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FlashCards Midterms > AnaPhy Lecture > Flashcards

AnaPhy Lecture Flashcards

1
Q

System Functions

A
  1. Movement
  2. Posture maintenance
  3. Respiration
  4. Body heat production
  5. Communication
  6. Organ & vessel constriction
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2
Q

The ability of muscle to shorten forcefully or contract

A

Contractility

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3
Q

The capacity of muscle to respond to a stimulus

A

Excitability

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4
Q

The ability to stretched beyond its normal resting length and still be able to contract

A

Extensibility

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5
Q

The ability of the muscle to recoil to its original resting length after it has been stretched

A

Elasticity

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6
Q

Surrounds each skeletal muscle

A

Epimysium/Muscular Fascia/Muscle Fascia

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7
Q

Surrounds the muscle fasciculi/muscular fasciculi/fasciculi

A

Perimysium

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8
Q

Surrounds the muscle fibers

A

Endomysium

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9
Q

Cell membrane of muscle fibers

A

Sarcolemma

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10
Q
  • Closely associated with the T-tubules
  • High Ca2+ concentration
A

Sarcoplasmic Reticulum

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11
Q
  • Enlarged portions
  • Two terminal cisternae and their associated T tubule form a muscle triad
A

Terminal Cisternae

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12
Q
  • Tubelike inward foldings along the sarcolemma
  • Connect the sarcolemma to the sarcoplasmic reticulum.
A

Transverse (T) Tubules

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13
Q
  • Cytoplasm of the muscle fiber
  • Contains numerous myofibrils
A

Sarcoplasm

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14
Q

A.k.a. thin filaments

A

Actin Myofilament

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15
Q

Two strands twisted together, have attachment sites for the myosin myofilaments

A

Actin

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16
Q

Molecules attached at specific intervals along the actin myofilaments - Have binding sites for Calcium (Ca2+)

A

Troponin

17
Q
  • Located between the twisted actin strands
  • Block the myosin myofilament binding sites on the actin myofilaments in an unstimulated muscle
A

Tropomyosin

18
Q

A.k.a. thick myofilaments
Resemble bundles of golf clubs.

A

Myosin Filament

19
Q
  • Parts of the myosin molecule that resemble golf club heads
  • The heads can bind to attachment sites on the actin myofilament
  • Can bend and straighten during contraction
  • Can break down ATP to release energy.
A

Myosin Head

20
Q
  • The cell membrane (sarcolemma) is polarized
  • Charge difference between the outside (positively charged) and inside (negatively charged) of the cell membrane
A

Resting Membrane Potential

21
Q
  • This is due to More Sodium (Na +) ions outside the cell membrane
    More Potassium (K+) ions inside the cell membrane
  • Some Na+ channels close thus trapping some negatively charged particles inside the cell. For these reasons, the inside of the cell membrane is more negatively charged than the outside of the cell membrane.
A

Resting Membrane Potential

22
Q
  • A stimulation in a muscle fiber or nerve cell causes Na+ channels to open quickly, making the membrane to become very permeable to Na+ for a brief time.
  • This causes an influx of Na+ ions, causing the inside of the cell membrane to become more positive than the outside of the cell.
A

Depolarization

23
Q
  • Near the end of depolarization, Na+ channels close and K+ channels open
  • The tendency for Na+ to enter the cell decreases, and the tendency for K+ to leave the cell increases.
A

Repolarization

24
Q
  • Causes changes in membrane potential to aid in cell-to-cell communication
  • 1-3 seconds
A

Action Potential

25
Q
  • Site where a motor neuron, at its axon terminals, excites a skeletal muscular fiber
A

Neuromuscular junction

26
Q

Form a stationary anchor for actin myofilaments

A

Z Disks

27
Q
  • two-lighter staining regions
  • contains only actin myofilament
A

I Bands

28
Q
  • A central darker-staining region
  • A band contains both actin and myosin myofilaments overlapping
A

A Bands

29
Q
  • Contains only myosin myofilaments
A

H zone

30
Q
  • The dark line on the middle of each H zone
A

M Line

31
Q

Are bundles of protein filaments, are long threadlike structures that extends the entire length of the muscle fiber

A

Myofibrils

32
Q

the neurotransmitter that was being contained by the synaptic vesicles

A

Acetylcholine

33
Q

refers to the attachment of myosin with actin within the muscle cell

A

Cross-Bridge

34
Q

Action Potential + Ca2 =

A

movement/contraction

34
Q

Action Potential + Ca2 =

A

movement/contraction

34
Q

Action Potential + Ca2 =

A

movement/contraction

FlashCards Midterms (11 decks)

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