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hammer [34]
3 years ago
5

Please also describe how actin-binding sites are made available for cross-bridging with myosin heads during contraction.

Biology
1 answer:
yaroslaw [1]3 years ago
3 0

Answer: The calcium ion binds to troponin, and this slides the tropomyosin rods away from the binding sites.

Explanation:

Contraction and relaxation of muscle cells brings about movements of the body. The contractile myofilament called sarcomeres are bounded at each end by a dense stripe called the Z - line, to which the myosin fibres are attached, and lying in the middle of the sarcomere are the actin filaments, overlapping with the myosin.

When action potential spreads from the nerve along the sarcolemma (muscle cell membrane), it penetrates deep into the muscle cell through the sarcoplasm (cytoplasm of muscle cell), and releases CALCIUM from the intracellular stores.CALCIUM triggers the binding of myosin to the actin filament next to it forming CROSS BRIDGES.

For this to occur, ACTIN BINDING SITE has to be made available. TROPOMYOSIN is a protein that winds around the chains of the actin filament and covers the myosin-binding sites to prevent actin from binding to myosin. The first step in the process of contraction is for calcium ions to bind to troponin so that tropomyosin can slide away from the binding sites on the actin strands.

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Answer:

Your answer is E). Fossils in different layers will obviously be much older/younger than others.

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3 years ago
The phrase "eating like a bird” is often used to express that someone only eats a small amount of food. Explain in detail why th
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Answer:

The phrase "eating like a bird” is inaccurate because the eating habits of birds and the amount of food they consume are a function of their size, activity and metabolism, amount of food that would be insufficient for one person.

Explanation:

The phrase "eating like a bird" establishes a comparison between the feeding of a bird and that of a person, referring to the small amount of food that birds consume.

In fact, birds consume food according to the high energy demand of flying, its weight, size, activity and metabolism. A real comparison would establish that birds even eat more than people.

The feeding of each species is different, and the phrase is inaccurate because it only states that a person who eats little food (less than their requirements) is consuming what would really be enough for a bird.

Learn more:

brainly.com/question/9066680

4 0
3 years ago
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This rock is made from sand and pebbles joined together. the rock formed in a river bed. it is an example of ____ rock.
guapka [62]
I believe the answer is C, Sedimentary rock.
Hope this helps.
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3 years ago
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What is the resistance of a circuit with a voltage of 10 volts (V) and a current of 5 amps (A)? Use Ohm’s law to calculate the r
kifflom [539]

Answer: R = 2 ohm

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                      U = R*I    --->   R = U / I

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