Mixed logicHardQuestion 9699
Question
Which statement is correct?
- AArteries and veins are defined by direction of blood flow relative to heartCorrect
- BAll arteries always contain oxygenated blood
- CAll veins always contain deoxygenated blood
- DCapillaries never take part in exchange
Correct answer
Arteries and veins are defined by direction of blood flow relative to heart
Explanation
Pulmonary vessels are exceptions to the oxygenation rule, so direction is the defining criterion.