Multiple Choice
Which of the following organs is primarily responsible for ridding the body of waste products in the urinary system?
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1. Introduction to Anatomy & Physiology
Introduction to Organ Systems
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Which of the following organs is not involved in the synthesis of vitamin D?
A
Skin
B
Kidney
C
Liver
D
Pancreas
Verified step by step guidance1
Understand the process of vitamin D synthesis: Vitamin D synthesis involves multiple organs, starting with the skin, then the liver, and finally the kidneys.
Identify the role of the skin: The skin is responsible for the initial step in vitamin D synthesis, where UVB radiation converts 7-dehydrocholesterol to previtamin D3.
Recognize the liver's function: The liver converts previtamin D3 into 25-hydroxyvitamin D, also known as calcidiol, which is the next step in the synthesis process.
Acknowledge the kidney's role: The kidneys convert 25-hydroxyvitamin D into the active form, 1,25-dihydroxyvitamin D, also known as calcitriol.
Determine the organ not involved: The pancreas is not involved in any step of vitamin D synthesis, making it the correct answer to the question.
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