NIC Cosmetology Written (Theory) ExamScientific ConceptsEasy
A cosmetologist is explaining the importance of proper blood circulation to a client during a facial massage. Which type of blood vessel is responsible for carrying deoxygenated blood back to the heart?
- AVeins
- BCapillaries
- CArteries
- DArterioles
Show answer & explanationAnswer & explanation
Correct answer: A. Veins
Veins are the blood vessels responsible for carrying deoxygenated blood from the body's tissues back to the heart. Arteries carry oxygenated blood away from the heart, and capillaries are where gas exchange occurs.
Why the other options are wrong
- B. Capillaries are tiny vessels where oxygen, nutrients, and waste exchange occurs between blood and tissues.
- C. Arteries carry oxygenated blood away from the heart (with the exception of pulmonary arteries).
- D. Arterioles are small arteries that branch into capillaries.
Veins
Blood vessels that carry deoxygenated blood from the body's tissues and organs back to the heart, typically having thinner walls and larger lumens than arteries.
- Carry deoxygenated blood (mostly)
- Return blood to the heart
- Have thinner, less muscular walls than arteries
- Contain valves to prevent backflow
Memory trick: Veins Vroom back to the heart with Vile (deoxygenated) blood