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Taya2010 [7]
3 years ago
8

Raynaud's disease results in brief periods of vasospasms. this disease affects blood supply to fingers and toes. it is also know

n to affect blood flow to lips, ears, nose and nipples. during what is called as "raynaud's attacks", the skin may turn white and then blue for a short time. which of these best describes why these symptoms occur?
Biology
2 answers:
faltersainse [42]3 years ago
5 0

The answer is excessive narrowing of blood vessels.

When exposed to the cold, our body tries to reduce its heat loss by tightening the arterioles under the skin (vasoconstriction). This mechanism increases the flow of blood into the deep veins and allows the body to maintain its internal temperature.

In people with Raynaud's disease, this reaction is excessive: the nerves that control the tightening of arterioles are hypersensitive and cause spasm, rather than normal vasoconstriction. When the spasm stops, the arterioles dilate again, restoring blood circulation.

balu736 [363]3 years ago
4 0
It results in the a narrowing of the arteries which slow blood flow 
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Answer and Explanation:

First, you need to know how to interpret a pedigree representation.

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→ Males are squares

→ Females are circles

  • Trait/Phenotype

→ Healthy/normal/not affected  individuals are represented with empty figures

→ Affected/mutated individuals are represented with solid black figures

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Now, what we need to do is to draw a pedigree for a hitchhiker’s thumb. We know that this is an autosomal dominant trait, which we will represent with an H. No hitchhiker's thumb is the recessive trait, and it will be represented with an h.

Our pedigree should cover at least two generations and include both dominant and recessive forms of the trait.    

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I → <u>First-generation:</u> First cross

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II → <u>Second-Generation:</u> F1 and second crosses

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You will find this pedigree in the attached files. In this example, we included three generations. The first one belongs to the grandparents, the second one to parents, aunts/uncles, and the third one to grandchildren.  

If you draw another pedigree, remember to include

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