Sliding Filament Model

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Consist of the SFM notes and edpuzzle

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36 Terms

1
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what is the sarcomere?

smallest functional unit of the skeletal muscle

2
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The myofibril is broken up into what type of repeating sigments?

sarcomere segments

3
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name the 5 types of regions in the sarcomere

  • I-band

  • A-band

  • H-zone

  • M-line

  • Z-disc

4
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What is the I-Band

It the region with ONLY actin filaments

5
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What is the A-band?

region of where ACTIN and MYSIN overlap

6
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What is the H-zone?

Region of ONLY Myosin filaments found in A-band

7
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What is the M-line?

center of the A-band where bridges between tick filament occur

8
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what is the Z-disc

Sarcomere begins/ends

9
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How many steps are in the SFT (sliding filament theory?)

4 steps total

10
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SFT: what is step 1?

Calcuim ions cause tropomyosin to move exposing actin molecule

11
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..SFT: step 2;

Allow myosin head to form a cross bridge; needs ATP

12
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What is ATP?

Adenosine Triphosphate

13
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When its at rest what is the myosin head attached to ATP turning it to what else?

ADP and Inorganic phosphate

14
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When Calcium ions arrive the myosin head releases ___(A)___ and ___(B)___ and binds with the actin site.

A: ADP

B: phosphates

15
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The energy released from the ATP cause myosin head to flex; what does that mean for the muscle?

The muscle contracts

16
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What is step 3 for SFT?

New molecule of ATP binds with Myosin head; the head releases the actin.

17
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Step 4 of SFT:

Calcium ions is pumped back to the SR; muscles relax

18
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Why is ATP important?

It is needed for muscle contraction

19
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Where does the ATP come from?

Breakdown of glucose in presence of oxygen

20
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What happens there is not enough O2 (oxygen) for glucose?

There will be a build up of Lactic acid in the body

21
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What cause lactic acid to muscles?

it makes them sore

22
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EDPUZZLE SECTION

suffer.

23
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What are two important protein of the muscle that are involved in the contraction AND relaxation of the Muscles?

A. Glucose + ATP

B. Actin + Myosin

C. Catalese + Pepsin

D. Clycine and Tryspin

B: Actin + Myosin

24
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What best describes smooth muscle tissue?

A. Voluntary, not striated

B. Involuntary, striated

C. Involuntary, not striated

D. Voluntary, striated

C. Involuntary, not striated

25
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The Cardiac Muscle Tissue is described as:

A. Branching

B. Involuntary

C. Striated

D. All of the Above

E. B and C only

D. All of the Above

26
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The Skeletal muscle is described as:

A. Voluntary, attached to bones, striated

B. Voluntary, attached to bones, NOT striated

C. Involuntary, attached to bones, striated

A. Voluntary, attached to bones, striated

27
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Name part of the skeletal muscle, smallest to largest (1-6).

  1. Myofilament

  2. Sarcomere

  3. Myofibril

  4. Muscle Fiber

  5. Fascicle

  6. Muscle

28
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Sarcomere is made up of;

Actin + Myosin filaments

29
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ToF: When the muscle is the rest; the actin and myosin are touching

False

30
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Relating to actin filaments; Tropomyosin and Troponin act like what?

They act like body guards

31
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Name the protein(s) that control muscle contraction.

  • Troponin

  • tropomyosin

32
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Calcium:

A. Is essential for muscle contraction

B. binds to regulatory protein Troponin on the thin actin filament

C. Is stored in a muscle fiber’s sarcoplasm reticulum where it can be quickly

D. all of the above

D. all of the above

33
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What do motor neurons release?

Neurotransmitter acetylcholine into the synaptic cleft.

34
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Where is the sarcolemma found?

Extends deep into the muscle fiber via T-Tubules

35
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Myosin first gets a chance to bind with the exposed act when __(A)__ binds with the troponin, and then it pulls the Tropomyosin away from the ___(B)___ on the actin.

A: Calcium

B: binding site

36
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ATP an important role in the movement of the myosin.

When Myosin binds to a new ATP molecule, what’s the first things it does with that ATP molecule

It breaks the ATP to ADP, phosphate and energy, and it holds onto it TEMPORARILY