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

Topics:
Nerve Injuries in Oral & Maxillofacial Surgery Thyroid and Intro to Endocrinology Disease Outbreak and Transmission Degeneration Pathology Alzheimer Disease Macro and Micro Nutrients Immunity & Cancer Genes and DNA Microbes Speed, Flexibility part of Components of Physical Fitness Muscle Origin, Insertion, and Function Heart Structure and Double Circulation Disabilities Macromolecules & Nutrients Anatomy and Physiology- Cardiovascular SysytemOther quiz:
Urinary System, Fluid, Electrolyte and ph Balance › ViewWhich ion’s concentration is regulated by the parathyroid?
A. Na
B. Cl
C. Ca
D. K
Organ Senses and Locomotor System › View
The disease in which the crystalline lense loses its transparency until it becomes opaque causing progressive loss of vision is called:
A. Conjunctivitis
B. Astigmatism
C. Cataracts
D. Myopia