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tatiyna
3 years ago
9

Which valves produce the second heart sound when they snap shut?

Biology
1 answer:
Taya2010 [7]3 years ago
5 0
Answer: D) Pulmonary and aortic valves.

Explanation
There are two main heartbeats from a healthy heart.

The first beat is called the S1 or the lub, and it occurs when the atrioventricular valves (comprising the mitral and tricuspid valves) close.

The second beat is called the S2 or the dub, and it occurs when the semilunar valves (comprising the aortic and pulmonary valves) close.

Listening for heart beats is an essential part of cardiac auscultation.
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What is the mass of an element with 15 protons, 13 electrons, and 11 neutrons?
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Answer:

B. 26amu

Explanation:

The nucleus of an atom in an element contains protons, electrons and neutrons. The proton number equals the electron number in a neutral atom. The proton number is also called the atomic number, denoted by Z.

The mass number also called Atomic mass unit (amu) in this case, of an element is the sum of the proton number and the neutron number in the atom of that element. The mass number is denoted by A.

Hence, A = Z + N

Where A = Mass number

Z = Proton (atomic number)

N = Neutron number

In this question, N is 11 while Z is 15

Hence, the mass number of the element in the question, in AMU, is 15 + 11 = 26amu.

8 0
3 years ago
Predict the type of progeny produced by Mendel's crosses between pure-breeding plants with discrete, antagonistic traits, such a
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The progeny produced is 100% heterozygous individuals.

Explanation:

Remember that in Mendel crosses, there are two alleles for each character, in this case for the color of the flowers.

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If two pure varieties with antagonistic characters intersect, 100% of heterozygous individuals will be obtained in the offspring.

As for its phenotype, it will depend on which allele is dominant over the other.

7 0
3 years ago
Approximately how much principal would need to be placed into an account earning 3.575% interest compounded quarterly so
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The relationship between the food we eat and the energy in our bodies is that food is converted to energy and without food we will not have energy, I think hopes this helped you out a little.

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Which graph shows logistic growth of a population? *
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