Topics: 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:
Pediatric Musculoskeletal Disorders Biological Organisms Classification Obstructive Lung Disease Anatomy and Physiology Skeletal System Teeth and Microbes Hormones Human Excretory System Vision and Light The Inflammatory Response Tib/Fib, Knee and Femur Medicine on the Western Front Illness and Symptoms Molecular Basis of Inheritance Disabilities Human Eye and Colourful WorldOther quiz:
Musculoskeletal System › ViewMuscle always work ___________
A. in pairs.
B. alone.
C. in groups of three.
Environment › View
Neutralism occurs
A. When populations are in their favourable environment
B. In habitats with high population density
C. When organisms are in their growing stage.
D. Between microbial populations in a community with extremely different metabolic characteristics.