This topic contains a solution. Click here to go to the answer

Author Question: In what state are oyster roasts a favorite? a. South Carolina b. Florida c. Delaware d. West ... (Read 89 times)

sdfghj

  • Hero Member
  • *****
  • Posts: 552
In what state are oyster roasts a favorite?
 a. South Carolina
  b. Florida
 c. Delaware
 d. West Virginia
 e. Maryland

Question 2

What is vitamin A's role in vision? What happens to your eyes when you don't get enough vitamin A?



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

kaylee05

  • Sr. Member
  • ****
  • Posts: 318
Answer to Question 1

a

Answer to Question 2

Vitamin A plays two indispensable roles in the eye. It helps maintain a healthy, crystal-clear outer window, the cornea; and it participates in light detection at the retina. Some of the photosensitive cells of the retina contain pigment molecules called rhodopsin; each rhodopsin molecule is composed of a protein called opsin bonded to a molecule of retinal, which plays a central role in vision. When light passes through the cornea of the eye and strikes the retina, rhodopsin responds by changing shape and becoming bleached. In turn, this initiates the signal that conveys the sensation of sight to the optic center in the brain. When vitamin A is lacking, the eye has difficulty adapting to changing light levels. At night, after the eye has adapted to darkness, a flash of bright light is followed by a brief delay before the eye can see again. This lag in the recovery of night vision is known as night blindness. Because night blindness is easy to test, it aids in the diagnosis of vitamin A deficiency. Night blindness is only a symptom, however, and may indicate a condition other than vitamin A deficiency.




sdfghj

  • Member
  • Posts: 552
Reply 2 on: Aug 19, 2018
Great answer, keep it coming :)


dantucker

  • Member
  • Posts: 346
Reply 3 on: Yesterday
:D TYSM

 

Did you know?

Dogs have been used in studies to detect various cancers in human subjects. They have been trained to sniff breath samples from humans that were collected by having them breathe into special tubes. These people included 55 lung cancer patients, 31 breast cancer patients, and 83 cancer-free patients. The dogs detected 54 of the 55 lung cancer patients as having cancer, detected 28 of the 31 breast cancer patients, and gave only three false-positive results (detecting cancer in people who didn't have it).

Did you know?

There used to be a metric calendar, as well as metric clocks. The metric calendar, or "French Republican Calendar" divided the year into 12 months, but each month was divided into three 10-day weeks. Each day had 10 decimal hours. Each hour had 100 decimal minutes. Due to lack of popularity, the metric clocks and calendars were ended in 1795, three years after they had been first marketed.

Did you know?

About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.

Did you know?

Oxytocin is recommended only for pregnancies that have a medical reason for inducing labor (such as eclampsia) and is not recommended for elective procedures or for making the birthing process more convenient.

Did you know?

Despite claims by manufacturers, the supplement known as Ginkgo biloba was shown in a study of more than 3,000 participants to be ineffective in reducing development of dementia and Alzheimer’s disease in older people.

For a complete list of videos, visit our video library