mitted to the Ottawa General Hospital after an accident that happened as they te at night. Here is what the patient reported upon admission at the hospital: home last night and did not see a hole on the sidewalk. It was very dark outside, Inot see anything. I fell on the ground and hit my head hard. In the last month this few times, where I feel I am totally blind at night. I can see just fine during the or if the light is dim. I have also felt pretty tired the last few days." e hospital, a blood test was performed on the patient and some of results were as Blood concentrations Patient 7 µg/dL 0.7 mg/dL Normal range 20-60 µg/dL 0.6-2 mg/dL tests, the doctor confirms that the patient's vision is altered but only in dark

Body Structures & Functions
12th Edition
ISBN:9781285695495
Author:Scott
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Chapter10: Special Senses
Section: Chapter Questions
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The doctor suggests a simple change in diet and recommends that the patient includes foods like fish,
cod liver, carrots, and fruits. The doctor also prescribes the following vitamin supplements:
●
Vitamin A: 900 µg/day
Vitamin C: 90 mg/day
1. Using the information above, which of the following is the most likely the cause of the patient's night
blindness?
A. A dysfunctional liver
B. An excessive concentration of vitamins in the blood
C. A deficiency in vitamin C
D. A deficiency in vitamin A
E. The head injury caused by the fall
Transcribed Image Text:The doctor suggests a simple change in diet and recommends that the patient includes foods like fish, cod liver, carrots, and fruits. The doctor also prescribes the following vitamin supplements: ● Vitamin A: 900 µg/day Vitamin C: 90 mg/day 1. Using the information above, which of the following is the most likely the cause of the patient's night blindness? A. A dysfunctional liver B. An excessive concentration of vitamins in the blood C. A deficiency in vitamin C D. A deficiency in vitamin A E. The head injury caused by the fall
A patient has been admitted to the Ottawa General Hospital after an accident that happened as they
were walking home late at night. Here is what the patient reported upon admission at the hospital:
"I was walking home last night and did not see a hole on the sidewalk. It was very dark outside,
and it was as if I could not see anything. I fell on the ground and hit my head hard. In the last month this
has happened to me a few times, where I feel I am totally blind at night. I can see just fine during the
day, but not at night or if the light is dim. I have also felt pretty tired the last few days."
Upon admission at the hospital, a blood test was performed on the patient and some of results were as
follow:
Vitamin A
Vitamin C
Blood concentrations
Patient
7 µg/dL
0.7 mg/dL
Normal range
Normal vision
20-60 µg/dL
0.6-2 mg/dL
After some additional tests, the doctor confirms that the patient's vision is altered but only in dark
conditions, a condition called nyctalopia or night blindness (see the figure below).
Night blindness
Page 1 of 13
Transcribed Image Text:A patient has been admitted to the Ottawa General Hospital after an accident that happened as they were walking home late at night. Here is what the patient reported upon admission at the hospital: "I was walking home last night and did not see a hole on the sidewalk. It was very dark outside, and it was as if I could not see anything. I fell on the ground and hit my head hard. In the last month this has happened to me a few times, where I feel I am totally blind at night. I can see just fine during the day, but not at night or if the light is dim. I have also felt pretty tired the last few days." Upon admission at the hospital, a blood test was performed on the patient and some of results were as follow: Vitamin A Vitamin C Blood concentrations Patient 7 µg/dL 0.7 mg/dL Normal range Normal vision 20-60 µg/dL 0.6-2 mg/dL After some additional tests, the doctor confirms that the patient's vision is altered but only in dark conditions, a condition called nyctalopia or night blindness (see the figure below). Night blindness Page 1 of 13
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