The type of epithelial tissue that lines the respiratory tract and moves mucus is: MCQ with Answer and Explanation

Explanation:
The iris contains smooth muscle fibers (sphincter and dilator) that regulate the diameter of the pupil. The cornea and lens focus light, retina senses it.

Explanation:
Pellagra, characterized by dermatitis, diarrhea, and dementia (3 Ds), is caused by a deficiency of niacin (vitamin B₃) or its precursor tryptophan. It is common in populations with corn-based diets lacking tryptophan. Beriberi is due to B₁ deficiency, cheilosis to B₂, peripheral neuropathy to B₆. Niacin is a component of coenzymes NAD and NADP.

Explanation:
Insulin stimulates GLUT4 transporters to move to the cell membrane, increasing glucose uptake in muscle and adipose tissue. Glucagon raises blood glucose.