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3 years ago

Skeletal muscle fibers are classified as ""fast"" or ""slow"" based upon what factor?

Biology

2 answers:

andrey2020 [161]3 years ago

6 0

Answer:

Skeletal muscles fibre are classified base on how the produce energy.

Explanation:

Skeletal muscles fibres consist of bundles of cells that form muscles which contain myobrills.

Skeletal muscles are classified based on how the produce energy;

Type 1 or slow pitch muscle fibres are more efficient and last for a long period of time. They are use for postural maintenance or endurance. It use aerobic respiration to produce energy or ATP.

Type 11 or fast twitch muscle fibres use anaerobic respiration and are for short speed and fatigue more easily than type 1.

Inessa05 [86]3 years ago

5 0

Answer:

The speed of the myosin ATPase.

Explanation:

Myosin ATPase is actually considered as molecular motor of muscle cells because it converts chemical energy into directional movement.

ATP comes and bind with the myosin. Now, it is in high-energy state. ATPase hydrolyzed the ATP into ADP by releasing of inorganic phosphate (Pi).

When myosin binds with the actin, then ATPase convert ATP into ADP and this chemical energy converts into directional movement (contraction) of muscle cells.

Myosin ATPase speed depends on the shortening of respective muscle. ATPase activity are higher when intrinsic speed increases.

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Which concept is not a part of the theory of evolution

garik1379 [7]

Answer:

I believe the options are:

1) Present day species developed from earlier species .

2) Some species die out when environmental changes occur .

3) Complex organism develop from simple organisms over time .

4) Change occurs according to the needs of an individual.

The answer is 4) Change occurs according to the needs of an individual.

Explanation:

Theory of Evolution:

By definition, evolution is the process of change in an individual's/organism's characteristics over time. Evolution occurs through mutations in the genetic information or DNA of an individual.
The theory of evolution states that all organisms change over time and are descendants of a single common ancestor. Species adapt to the changing environment by introducing variations in their DNA over millions of years. Harsh environment conditions eliminate organisms that cannot adapt to the changing environment and only the fittest survive. This is called natural selection.
This process, occurring over millions of years, results in the formation of an entirely new species.
The theory of evolution is contrary to the concept of Lamarckism or inheritance of acquired characters which states that characters that an organism acquires during its lifetime can be passed on to its offspring.

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