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RideAnS [48]
3 years ago
14

The opening and closing of _____________in your heart create the lub-dub sound and prevent the backflow of blood.

Biology
1 answer:
iVinArrow [24]3 years ago
4 0

Answer:

Heart valves or the closure of the mitral and tricuspid atrioventricular (AV) valves at the beginning of ventricular systole and the closure of the aortic valve and pulmonary valve at the end of ventricular systole.

Explanation:

The heart tone “lub,” or S1, is caused by the closure of the mitral and tricuspid atrioventricular (AV) valves at the beginning of ventricular systole.

The heart tone “dub,” or S2 ( a combination of A2 and P2), is caused by the closure of the aortic valve and pulmonary valve at the end of ventricular systole.

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Which of the following scenarios is representative of mutualism?
ycow [4]

<span>The correct answer is B. Bees pollinating flowers.</span>

<span>
In biology, mutualism is how two different organisms survive upon the activity of the other. Each benefits from the mutual relationship. In the case of bees pollinating flowers, both the bees and the flowers need something and benefit from the interaction with the other. </span>

8 0
3 years ago
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How do the structures of the fruiting body and hyphase relate to their function
Y_Kistochka [10]

Answer:

Fungi is a unique living organism and it is not considered plant or animal and forms its own kingdom Fungus. On of the most unique features of a Fungi is that its body is composed of thread like structure called Hyphae and produce fruiting bodies, in which spores are formed are help the fungus in reproduction.

Coming towards the question that what is the unique feature of the structure of Hyphae and fruiting body that helps them in their function.

1: Hyphae:

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2: Fruiting body:

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Hope it helps!

6 0
3 years ago
What processes occur during G2 phase? Choose all which apply.
Inessa [10]

Explanation:

the last part of interphase is called the G2 phase. The cell has grown, DNA has been replicated, and now the cell is almost ready to divide. This last stage is all about prepping the cell for mitosis or meiosis. During G2, the cell has to grow some more and produce any molecules it still needs to divide.

4 0
3 years ago
The first two steps in the lithification process are:
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Answer:

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Explanation:

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What is the Division of somatic cells that involves duplication of DNA in diploid # called
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