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Travka [436]
4 years ago
10

When calcium ions are released into muscle fibers, what happens along the actin filament? Multiple Choice The position of the tr

opomyosin threads shift, hiding myosin binding sites, causing the myosin head to move farther away from the actin filament. The position of the tropomyosin threads shift, exposing myosin binding sites, allowing the myosin head to attach to the actin filament. The position of the actin filaments shift, exposing myosin binding sites, causing the myosin head to move farther away from the tropomyosin threads. The position of the actin filaments shift, hiding myosin binding sites, allowing the myosin head to attach to the tropomyosin threads.
Biology
1 answer:
zimovet [89]4 years ago
5 0

Answer:

The correct answer will be options

1. The position of the tropomyosin threads shift

2. Exposing myosin binding sites

3. Allowing the myosin head to attach to the actin filament

Explanation:

Calcium plays an important role in the contraction of muscles especially in the formation of the cross-bridge between myosin and actin filaments.

In the presence of calcium, myosin head binds the actin filament as calcium binds to the troponin which changes the configuration of the troponin which releases the tropomyosin from the myosin-binding site on actin.

Once the myosin binding site is freed, myosin binds the site and causes muscle contraction due to ATP hydrolysis.

Thus, the selected options are the correct answer.

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What are the species that are labeled a to e?
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3 years ago
Intermediate photographs should show the relation of evidence to other parts of the crime scene. A. True B. False​
hichkok12 [17]

Answer:

True.

Explanation:

<em>"adjective </em>

<em>adjective: intermediate </em>

<em>coming between two things in time, place, order, character, etc."</em>

Pictures correlating to the crime scene are like puzzles to find out the other meanings or cause of another picture.

For example:

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The jug is now laying on the table, dripping everywhere.

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If we take out the middle picture "There's a blurred figure of a hand hitting the jug.", then we would not know what hit it over. Did someone bump into the table? Did a cat climb onto the table and release its almighty strength onto it? All we would know that it was once standing upright.

TLDR; Without intermediate pictures, it would be hard to grasp what happened on the scene. Intermediate pictures all have something in common with each other to help interpret what occurred to the viewer.

5 0
4 years ago
Why would tissue from the fetal stage of human development be used to look at mitosis?
WITCHER [35]
Mitosis is the process of cell division, where one parent cell divides to produce two genetically identical daughter cells. This process is vital in growth and tissue repair. 
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8 0
3 years ago
In a long bone, the osteons are:
Margarita [4]

Answer:

B. lined up perpendicular to the long axis of the bone, in the direction of perforating canals.

Explanation:

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I hope you find this information useful and interesting! Good luck!

3 0
3 years ago
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2NH3 is equivalent to N2 + H6 since the 2 at the beginning gets distributed to both atoms. Knowing this you can rewite the equation as

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You now have to ask ‘2 times what equals 6?’ The answer is obviously 3 at this point.


Answer: C. 3


5 0
4 years ago
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