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seropon [69]
2 years ago
11

Opening and closing of the heart valves is caused by

Biology
1 answer:
storchak [24]2 years ago
6 0

Answer:

The pressure differences on either side of the valve.

Explanation:

The heart valves open and close passively because of pressure differences on either side of the valve. When pressure is greater behind the valve, the leaflets are blown open and the blood flows through the valve. However, when pressure is greater in front of the valve, the leaflets snap shut and blood flow is stopped.

Hope this helps!

have a blessed day

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what term refers to a situation where a single phenotypic character is determined by the additive effects of two or more genes?
vampirchik [111]

Answer:

Explanation:

Polygenic inheritance refers to a situation where a single phenotype character is determined by the addictive of two or more genes.

hope it helps :)

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astraxan [27]

angle of incoming sunlight

Explanation:

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  • Around the equator, the sun is overhead and these regions are usually hot driving a wide range of weather phenomenon.
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learn more:

Sunlight brainly.com/question/1739812

#learnwithBrainly

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