Topics: 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:
Transportation in Organisms Enzymes and Metabolic Pathways Hemodynamics Bacteria & Viruses Healthy Living Vocabulary MS Neurology Vital Signs Biology Assessment Hematology Acute Leukemias The Cell Lungs Children Well-being Pathogens, Disease and Immunity Environment Nutritional MeasurementsOther quiz:
Human Circulatory System › ViewWhat is the main function of the heart in the human circulatory system?
A. Regulating body temperature
B. Producing antibodies
C. Filtering waste from the blood
D. Transporting oxygen to the body
Genetics › View
Which of the following cell types is formed by meiosis?
A. muscle cells
B. skin cells
C. sperm cells
D. blood cells