Zinc (The Third Micromineral)

Question 1

Total body content of zinc in adults

Answer 1

2g

Question 2

Daily requirement of zinc

Answer 2

15mg

Question 3

Serum concentration of zinc

Answer 3

100µg/dL

Question 4

Where is zinc absorbed?

Answer 4

In the duodenum

Question 5

How is zinc transported?

Answer 5

Bound to metallothionein

Question 6

How are zinc and copper absorption related?

Answer 6

Increased oral intake of zinc interferes with copper absorption

Question 7

What are the biochemical functions of zinc?

Answer 7

1. Enzyme activity: Zinc is the prosthetic group in many metal enzymes.
2. Synthesis of retinol binding protein
3. Storage and secretion of insulin from β cells
4. Skin integrity and wound healing
5. Taste sensation
6. Spermatogenesis

Question 8

What are some disorders of zinc metabolism?

Answer 8

1. Anemia
2. Hypogonadism & dwarfism
3. Psychiatric disturbances
4. Acrodermatitis enteropathica - Inherited defect in zinc absorption from gut