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DochEvi [55]
2 years ago
12

Thank you brainly for all your questions. You really helped me get through online classes. Here's some points everyone :) have a

nice day or night
Health
2 answers:
Marysya12 [62]2 years ago
8 0

Answer:

awww. same i started with Ds now i have Bs

Explanation:

mel-nik [20]2 years ago
5 0
Aww thank you i needed this i love brainly too i even made friends
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Which of the following BEST describes varicose veins? A. Veins cannot prevent the backflow of blood. B. Veins lose the ability t
Ksenya-84 [330]

Answer:

Varicose veins can best be described as veins cannot prevent the backflow of blood.

Explanation:

Varicose veins are a manifestation of venous insufficiency or peripheral vascular insufficiency.

Veins are blood vessels that, unlike arteries, are not able to contract, so they depend on gravity, muscle contractions and a system of valves to be able to carry blood to the heart.

<u>When the venous valves do not work, the blood is not transported properly, backflow occurs and is retained, producing dilation of the vein walls, which is characteristic of varicose veins</u>. In this case, veins cannot prevent the backflow of blood.

The other options are not correct because:

  • <em>Varicose veins do not lose their ability to transport blood. </em>
  • <em>Veins cannot be used to transport blood from the heart. </em>
  • <em>Failure to adequately transport waste to the heart does not apply in this case.</em>
6 0
3 years ago
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When the skin is exposed to ______, the skin produces a molecule that is turned into vitamin d.
Aleks04 [339]

When the skin is exposed to ultraviolet rays, the skin produces a molecule that is turned into Vitamin D.

Sun is the source of ultraviolet rays important for Vitamin D production. Due to this reason, in the case of Vitamin D deficiency, it is recommended by doctor's to absorb sunlight by skin. The Vitamin D production occurs specifically by UV B rays rays which lie in the range of 290-315 nanometer.

The chemical 7-dehydrocholesterol absorbs these rays and convert to previtamin D3. Further, previtamin D3 isomerizes to Vitamin D. Other than sunlight, Vitamin D can be taken through diet. The sources include seafood like fish, fish oil, dairy products, beef liver etc. Vitamin D is required for bone and teeth formation, muscle contraction, immune system etc.

Learn more about Vitamin D -

brainly.com/question/4551554

#SPJ4

8 0
2 years ago
Why did Dimitri most likely get the flu? Vaccinations are not always effective. Vaccinations are not effective if hygiene is poo
Molodets [167]

Answer:

Vaccinations are not always effective.

Explanation:

trust me

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2 years ago
This action toward a family member may be taken if he or she has a chemical dependency. A. divorce B. bargaining C. intervention
SVETLANKA909090 [29]
<span>C. intervention
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3 years ago
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What is the primary site for absorption of nutrients?
vova2212 [387]
Small Intestine, mainly Jejunum and Ileum
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