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3 years ago

Which of the following events triggers the subsequent steps of excitation-contraction coupling?

Biology

2 answers:

Mila [183]3 years ago

7 0

Answer:

d. propagation of an action potential along the sarcolemma and T tubules

Explanation:

Excitation-contraction coupling occurs in the body as an electrical signal to the muscles, which must capture this signal and perform muscle contraction.

After this signal is emitted, an action potential is generated that will act on the neuromuscular junction and spread quickly and coordinated by the sarcolemma, reaching the T tubules.

In the T tubules, receptors of dihydropyridine receptors are located, which will continue the process, until muscle contraction is performed.

mario62 [17]3 years ago

3 0

Excitation-contraction coupling refers to the series of events that begins with the excitation of the sarcolemma in response to stimulation by a neurotransmitter, and results in the release of calcium ions from the sarcoplasmic reticulum.

Hence, option D is the 1st process that starts the excitation-contraction coupling.

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2 years ago

Using the 10 percent rule, explain why there is typically smaller populations of quaternary consumers compared to primary consum

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Answer:

As we know 10% law is transfer of energy from higher trophic level to lower trophic level. So as the energy are transfer from one organism to another there is a loss of energy as that energy are utilised by the oragnism and only 10% of the total energy is transferred to the second consumer.

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Quetinary consumer are at the higher position in the food chain so they do not get enough energy from prey they have to feed on several organism for the enegy. And also they are at the top of the food chain so they are not eaten by other animal, their life span are also more than primary consumer.

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3 years ago

I need help with this (#20)

tester [92]

Answer:

a Anaphase I

b Metaphase I

c Telophase I

d Anaphase II

e Prophase I

f Telophase II

Explanation:

Prophase I begins after the DNA has been duplicated, as shown in picture e. The chromosomes are condensed, and also visible, which is apparent in picture e.

The next stage is called Metaphase I, in which the pairs of homologous chromosomes align at The the centre of the cell and the spindle fibres attach, as shown in picture b.

The pairs of chromosomes are pulled apart to opposite poles of the cell by the spindle fibres., as shown in picture a. This stage is called Anaphase I.

Then, a process called Telophase I occurs, when the cell divides into two daughter cells. One of these cells is shown in picture c.

Picture d shows the stage Anaphase II, where the spindle has attached and the chromatids are pulled to the opposite poles of the cell.

The final picture left is picture f, which shows the daughter cell at the end of meiosis II, where the nuclear envelope is reforming, as in telophase II.

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3 years ago