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Ostrovityanka [42]
3 years ago
13

I need this for tonight help me pls!!!

Biology
1 answer:
Sidana [21]3 years ago
5 0

Answer:

I do not see the picture

Explanation:

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2 years ago
QUESTION 1
nata0808 [166]

Answer:

According to the sliding-filament model of contraction, the muscle contraction occur due to the myosin heads propel the actin myofilaments toward the center of the sarcomere. This pulls the Z disks closer together, shortening  sarcomere and the entire muscle

Explanation:

In the muscle fiber there are two proteins that facilitate the process of contraction, myosin and actin. Myosin is thicker and more abundant than actin, and its interaction is responsible for the process of muscle contraction.

Both molecules, myosin and actin, form bonds -called cross bridges- where the myosin heads produce the mobilization of actin towards the center of the sarcomere. Z discs are associated with actin myofibrils, so they come close, and promote the shortening of the sarcomere.

This process requires the action of calcium ions, which depolarize the muscle cell and consume energy in the form of ATP.

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Learn more:

Types of muscle contraction brainly.com/question/7117064

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