Which of the following is true about veins?
A. Veins carry blood away from the heart, while arteries carry blood to the heart
B. Veins are more muscular than arteries
C. Veins have valves; arteries do not
D. Veins have a smaller diameter lumen than arteries
Answer: Option C
Solution(By Examveda Team)
Veins are blood vessels that carry blood toward the heart. Most veins carry deoxygenated blood from the tissues back to the heart; exceptions are the pulmonary and umbilical veins, both of which carry oxygenated blood to the heart. In contrast to veins, arteries carry blood away from the heart.Veins are less muscular than arteries and are often closer to the skin. There are valves in most veins to prevent backflow.
Ordinary table salt is sodium chloride. What is baking soda?
A. Potassium chloride
B. Potassium carbonate
C. Potassium hydroxide
D. Sodium bicarbonate
A. hole in ozone layer
B. decrease in the ozone layer in troposphere
C. decrease in thickness of ozone layer in stratosphere
D. increase in the thickness of ozone layer in troposphere
A. angiosperms
B. gymnosperms
C. monocotyledons
D. dicotyledons
Pollination is best defined as
A. transfer of pollen from anther to stigma
B. germination of pollen grains
C. growth of pollen tube in ovule
D. visiting flowers by insects
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