★ Skin Structure, Growth, & Nutrition Quiz
What is the principal component of hair and nails
A. collagen
B. melanin
C. elastin
D. keratin
Select your answer:
Topics:
Stem Cells & Cell Differentiation Nail Limitation of Senses Protozoan Diseases Characteristics of Life Skin Diseases Infection Cosmetology Anatomy Mutations Bones and Muscles Digestive System (Gastroenterology) Musculoskeletal LE Pediatrics Polio Renal, Cancer, HIVOther quiz:
Skeleton and Muscles › ViewWhat happens to biceps and triceps when you straighten your arm?
A. The biceps muscle is contracted and the triceps muscle is relaxed
B. The biceps muscle is relaxed and the triceps muscle is contracted
C. Both biceps and triceps are contracted
D. Both biceps and triceps are relaxed
My Teeth › View
How many types of teeth we have ?
A. 4
B. 1
C. 6
D. 3