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prohojiy [21]
3 years ago
6

In twitch summation, a) the muscle fiber is stimulated again before the filaments have completely returned to their resting posi

tion b) stronger muscle contractions occur but stronger action potentials do not uoccur c) a second action potential occurs in the muscle fiber, before the first action potential is finished d) both a and b are correct e) all of the above are correct
Biology
1 answer:
Ainat [17]3 years ago
7 0

Answer:

the correct answer is E

Explanation:

In the sum of contractions, the action potentials are sent more frequently but not with greater intensity, this is because in the motor plate the neurotransmitters do not cease and continue to bind to their receptors, promoting the stimulation of muscle fiber, once the muscle fiber contracts, before returning to its depolarized or resting moment a new contraction begins, some researchers maintain that these contractions are stronger but that the action potential that stimulates them does not refer to more power.

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Explanation:

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When is the best time to harvest crops?why?​
Nady [450]

\huge \bold \blue{★Question★}

When is the best time to harvest crops? why?

\huge \bold \blue{★Answer★}

Correct timing of harvest is crucial to crop loss prevention. Grain losses may occur caused by rats, birds, lodging, insects, and shattering. Timely harvesting ensures good grain quality and high market value.

Harvesting too early will result in a higher percentage of unfilled or immature grains, which will lower the yield and cause higher grain breakage during milling. Harvesting too late will lead to excessive losses and increased breakage in rice. Harvest time also affects the germination potential of rice seed.

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There are different ways to determine the correct harvest time:

Moisture content

Grain moisture content ideally is between 20−25% (wet basis). Grains should be firm but not brittle when squeezed between the teeth.

Ripe grains per panicle

The crop should be cut when 80−85% of the grains are straw (i.e., yellow-colored).

Number of days after sowing

Generally, the ideal harvest time lies between 130 and 136 days after sowing for late, 113 and 125 for medium, and 110 days for early-maturing varieties.

Number of days after heading

For dry season harvesting, an optimum time is 28 to 35 days after heading. In wet season harvest, optimum time is 32 to 38 days after heading.

Other considerations

Harvesting also needs to be timed so that threshing can be done as soon as possible after cutting to avoid rewetting and to reduce grain breakage.

If the crop has a lot of surface moisture, (e.g. from previous rainfall or early in the morning), it is advisable to wait until the surface moisture dries off.

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