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GalinKa [24]
3 years ago
10

Closure of the atriventricular valve occurs when:

Biology
1 answer:
elena55 [62]3 years ago
4 0

Answer:

The correct answer will be option A.

Explanation:

The atrioventricular valve is one of the four valves present in the heart the function of which is to stop the back flow of the blood from the ventricles to the atrium.  

These valve opens and closes in response to the change in the pressure of the blood in atrium and ventricles.  The valve opens when blood is pumped form the atrium to ventricles which causes the papillary muscles to relax while the valve closes when the ventricles push the blood to the arteries. This causes the papillary muscle to contract which causes the chordate tendineae to create tension ad close the valve.

Thus, option A is the correct answer.

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Stacey wants to know if plants have the same phototrophic reaction from artificial light as they do from natural light. Using st
joja [24]

Scientific method includes some steps that are necessary for conducting the successful experiment.

1. Make an observation

You observe the growth of the plant under the influence of light (phototropic effect) and you notice that some plants successfully grow under artificial light. You want to compare that growth with growth under the sunlight.

2. Ask a question

How does the light influence plant growth?

Are the wavelengths of the light important?

Is natural light source (sun) better for plant growth...

3. Form a  hypothesis - it is a testable potential answer to the question

For example: Sunlight induces higher phototropic reaction.

4. Make a prediction

Sunlight is richer in red and blue hues which are both extremely important to plant growth.  

5. Test the prediction

Design an experiment by putting one pot with beans outside on sunlight and other under the light bulb. Other conditions such as water must be the same. Monitor their growth for about 2 weeks and measure the results.

6. Analyze the data and make a conclusion.


8 0
3 years ago
Which of the following statements is true?
faust18 [17]

Answer:

im pretty sure it's the second option .-.

4 0
3 years ago
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- what are two reasons why the height of clouds vary from day to day?
maksim [4K]

Some clouds form as air warms up near the Earth's surface and rises. ... That warmed air starts to rise because, when warm, it is lighter and less dense than the air around it. As it rises, its pressure and temperature drop causing water vapor to condense.

https://scied.ucar.edu/learning-zone/clouds/how-clouds-form

I hope this helped :)

6 0
3 years ago
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What is the name of the process in which an organism makes a new organism?
Kay [80]
The answer is D.Reproduction 
Hope i helped :)
3 0
3 years ago
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xz_007 [3.2K]

Answer:

50%

Explanation:

Since A is only repeated twice, it could be 50%.

Hope this helps!

7 0
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