Vitamin D Flashcards
What is the most active form of vitamin D?
Calcitriol
Calcitriol is also a ______ ?
Hormone
What is the DRI for vitamin D?
600 IU/day
What are some food sources of vitamin D?
Fish Liver Oils
Fatty Fish
Eggs
Liver
Butter
Fortified Juices
Milk
Shitake Mushrooms
Ergocalciferol is a form of _____ ?
Vitamin D2
Cholecalciferol is a form of _____ ?
Vitamin D3
Exposure to sunlight converts 7-dehydrocholesterol to _____ ?
Vitamin D
Vitamin D is absorbed from _____ with _____ ?
Micelle with Lipids
Vitamin D enters circulation via?
Chylomicron
In the Liver, cholecalciferol is converted into?
25-OH cholecalciferol
In the kidney, 25-OH cholecalciferol is converted via?
Parathyroid Hormone (PTH)
Low calcium levels stimulate?
Parathyroid Hormone (PTH)
Parathyroid Hormone increases the production of?
Calcitriol
Calcitriol stimulates calcium absorption a the ______ ?
Intestine
Calbindin stimulates the synthesis of?
Calcium Absorption
Low calcium levels stimulate calcitriol through _____ which increases renal calcium ______ ?
PTH > Renal Calcium Reabsorption
Calcitriol + PTH = ?
Osteoclast Signaling
Calcitriol may prevent _____ ?
Cancer Growth
Rickets is the symptoms of?
Bowed Legs, Knock-Knees
Rickets is the condition of?
Not enough calcium in bone & weight-bearing TUT changes in bone structure
Blood Calcium is kept normal at the expense of?
Bones
People with fat malabsorption are at risk of?
Vitamin D deficiency
Populations at risk of vitamin D deficiency are?
Winter Infants (born/remain inside)
Vegans
Elderly
Renal/Liver Disease
Dark Skin
Vitamin D Toxicity can result in _______ calcification.
Soft-Tissue
