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liubo4ka [24]
3 years ago
12

Identify the structure of the human heart that rises from the pulmonary trunk, bends to the right behind the aorta, and divides

into two branches at the root of the right lung.
Biology
1 answer:
Anna35 [415]3 years ago
6 0

Answer:

Right pulmonary artery

Explanation:

Based on the scenario being described within the question it can be said that the structure being described is known as the Right pulmonary artery. This is the longer and also the larger of the two arteries that conveys venous blood from the heart to the lungs. This artery is roughly 3 cm in diameter and 5 cm in length, and it's main function is delivering oxygen-depleted blood to it's corresponding lung.

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Explain incomplete dominance, using snapdragon<br> flowers as an example.
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Answer:

Dominant allele does not completely conceal recessive allele.

Snapdragon with genotype Rr (R being red and r being white), would have a phenotype of pink flowers.

Explanation:

Incomplete dominance is where a dominant allele is not able to completely conceal a recessive allele, usually leading to a phenotype which appears to be a combination of the two.

For example, in snapdragons:

The allele for red flowers (R) is dominant over the allele for white flowers (r). Let's say a snapdragon flower had the genotype Rr, one allele for red flowers and one for white. In the case of 'normal' dominance the dominant red flower allele (R) would mask the effects of the recessive white flower allele (r), resulting in the phenotype (outward observable characteristics) of having red flowers.

However here in the case of incomplete dominance, the dominant allele would not be able to fully cover up the effects of the white flower allele, meaning that both colors (red and white) are expressed in the phenotype, resulting in pink flowers.

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During pollination in seed plants, pollin grains
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Explanation:

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What organs/systems is affected by the sympathetic nervous system but is NOT affected by the parasympathetic nervous system?
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Answer: cellular metabolism

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Cellular metabolism is affected by the sympathetic nervous system but is not affected by the parasympathetic nervous system.

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