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lorasvet [3.4K]
3 years ago
10

For what reasons could a theory be changed or replaced? Check all that apply.

Biology
1 answer:
julsineya [31]3 years ago
7 0

1. New technology is developed that provides more information about the theory.

2. New experimental methods are designed to test a theory.

3. A single experiment produces results that differ from all previous experiments.

im not sure about #3 but it could be it

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Using the sliding flament theory, explain (or draw) the process of sarcomere shortening. Start from the point where calcium woul
Arte-miy333 [17]

Answer:

  1. Calcium binds to troponin C
  2. Troponin T moves tropomyosin and unblocks the binding sites
  3. Myosin heads join to the actin forming cross-bridges
  4. ATP turns into ADP and inorganic phosphate and releases energy
  5. The energy is used to impulse myofilaments slide producing a power stroke
  6. ADP is released and a new ATP joins the myosin heads and breaks the bindings to the actin filament
  7. ATP splits into ADP and phosphate, and the energy produced is accumulated in the myosin heads, starting a new cycle
  8. Z-bands are pulled toward each other, shortening the sarcomere and the I-band, producing muscle fiber contraction.

Explanation:  

In rest, the tropomyosin inhibits the attraction strengths between myosin and actin filaments. Contraction initiates when an action potential depolarizes the inner portion of the muscle fiber. Calcium channels activate in the T tubules membrane, releasing <u>calcium into the sarcolemma.</u> At this point, tropomyosin is obstructing binding sites for myosin on the thin filament. When calcium binds to troponin C, troponin T alters the tropomyosin position by moving it and unblocking the binding sites. Myosin heads join to the uncovered actin-binding points forming cross-bridges, and while doing so, ATP turns into ADP and inorganic phosphate, which is released. Myofilaments slide impulsed by chemical energy collected in myosin heads, producing a power stroke. The power stroke initiates when the myosin cross-bridge binds to actin. As they slide, ADP molecules are released. A new ATP links to myosin heads and breaks the bindings to the actin filament.  Then ATP splits into ADP and phosphate, and the energy produced is accumulated in the myosin heads, which starts a new binding cycle to actin. Finally, Z-bands are pulled toward each other, shortening the sarcomere and the I-band, producing muscle fiber contraction.

4 0
2 years ago
I
jekas [21]

a) volume in cm³ = 20 × 42 × 42 = 35280 cm³

b) volume in m³ = 0.2 × 0.42 × 0.42 = 0.03528 m³

c) volume in ml³ = 200 × 420 × 420 = 35280000 ml³

d) volume in litres = 0.02 × 0.042 × 0.042 = 0.00003528 l³

e) Density = Mass / Volume

Mass = Volume × density

= 0.00003528 × 1

= 0.00003528 × 1000

= 0.03528 grams

f) Mass in kilo gram = 0.00003528 kg

3 0
3 years ago
How many times greater is 50 than 34?
butalik [34]
50 is 16 times greater than 34
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3 years ago
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Steps that occur in the scientific process are listed below. What is the correct order in which the steps should occur? (put the
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Make an observation

Form a hypothesis

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analyze the results

Draw a conclusion


4 0
3 years ago
Where do the cements that hold sediments together come from
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They come from crementation which is when  disolved minerals are deposited in tiny spaces...
 
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