Select your answer:
Topics:
Microbiology Nutrition Dentistry The Cell The Cell Cycle & Cancer Pathophysiology - Adaptive Immunity Health Unit Coordinating Proteins, Amino Acids, & Enzymes Hematologic System Cell Structure and Functions Dementia Type 1 Diabetes Environmental Biotechnology Properties of The Hair and Scalp Diseases of The Digestive SystemOther quiz:
Integumentary and Musculoskeletal Systems › ViewWhat is the substance within the epidermis which shields us from the harmful ultraviolet (UV) rays?
A. melanocytes
B. keratin
C. melanin
D. sebum
Human Anatomy and Physiology - Types of Tissues › View
This type of muscle makes up the majority of the heart.
A. Cardiac
B. Skeletal
C. Smooth
D. Bumpy