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3 years ago

Which one of the following events occurs first in a nerve impulse

1 answer:

5 0

Since you left off the choices, I have to just present the facts of what occurs first in the nerve impusle. The first thing that will is happen is the sodium ios will move to the inside of the nueron. The second step is the potassium ions will move to the inside of the neuron. After those move into the nueron, calcium will then move into the nueron. Both the sodium and potassium have 1 postive charge. While the calcium ion has 2 positive charges.

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Cells from advanced malignant tumors often have very abnormal chromosomes as well as an abnormal number of chromosomes. What mig

patriot [66]

Answer:

Option- D: Is the best choice to choose from the given options.

Now, let us explain the term Cell cycle in a more comprehensive way.

As the cell cycle is controlled at three checkpoints.

The integrity of the DNA is assessed at the G₁ checkpoint.

Proper chromosome duplication is assessed at the G₂ checkpoint.
Attachment of each kinetochore to a spindle fiber is assessed at the M checkpoint.

Explanation:

The cell cycle is controlled by three internal checkpoints that evaluate the condition of the genetic information.

The G₁ Checkpoint:This stage determines whether all conditions are favorable for cell division to proceed. The cell can halt the cycle and attempt to remedy the problematic condition, or the cell can advance into G₀ (inactive) phase and await further signals when conditions improve.
The G₂ Checkpoint: The most important role of the G₂ checkpoint is to ensure that all of the chromosomes have been accurately replicated without mistakes or damage.
The M Checkpoint:It occurs near the end of the meta-phase stage of mitosis. it determines whether all the sister chromatids are correctly attached to the spindle micro-tubules

5 0

3 years ago

Matt just woke up out of bed. He took his pulse for 10 seconds and got 10. What is his resting heart rate?

rusak2 [61]

Answer:

60 beats per minute

Explanation:

heart rate is measured in minute, if he counted for 10 seconds, he would need to multiply that number by 6 to get his resting heart rate. 10×6=60

6 0

3 years ago

An element has a half-life of 30 years. If 20 mg of this element decays over a period of 90 years, how many mg of this element w

Vlada [557]

Answer:

2.5 mg

Explanation:

The half-life of a substance is the time required for one half of the substance to decay. In order words, it is the time it will take for a substance to decay into half of its initial size.

For a 20 mg element with a half-life of 30 which decays over a period of 90 years;

The first 30 years, 10 mg would have decayed, remaining 10 mg

The second 30 years, the remaining 10 mg would have decayed to 5 mg

The third 30 years, 5mg would have decayed to 2.5 mg.

Hence, in 90 years, 20 mg of the element would remain only 2.5 mg.

7 0

3 years ago

What are the five fields of plant biology? Please explain your answer !! Thank you!

ivanzaharov [21]

Answer:

Plant biochemistry.

Plant ecology.

Plant evolution.

Plant physiology.

Plant anatomy and morphology

4 0

3 years ago

The competitive exclusion principle states that two organisms cannot fill similar niches. T F

belka [17]

It is true.

The organism will die at a faster rate. The competitive exclusion principle states that no two organisms can occupy exactly the same niche in exactly the same habitat at exactly the same time. This is also true according to several online sources.

3 0

3 years ago

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