★ The Blood Quiz
Which blood vessel has valves to prevent the back-flow of blood?
A. Veins
B. Arteries
C. Capillaries
Select your answer:

Topics:
Biotechnology Viruses and Prions Sports Medicine Doctor Equipments Enzymes and ATP Structure Skeleton and Muscles Linked Gene Biotechnology and Genetic Engineering Division of Microbiology Child Development Tissues Vet Science Terms Cell Cycle Problems Body System Integumentary System: Skin Disorder Disease, Immunity, and PhatogensOther quiz:
Hematology › ViewHow many types of white blood cells (leukocytes) are there?
A. Three
B. Four
C. Five
D. Six
Special Senses › View
How is glaucoma usually treated?
A. Medication
B. Surgical removal of the lens
C. Corrective lenses
D. Radial kertotomy