Question

Which one contains only mesodermal structures?

• A. Liver, heart, blood and muscles
• B. Notochord, heart, blood and bone
• C. Liver, heart, blood and bone
• D. Liver, blood, notochord and muscles

Answer 1

The correct option is B Notochord, heart, blood and bone

The inner cell mass of the blastocyst after implantation differentiates into an outer ectoderm, middle mesoderm and inner endoderm. These layers then develop into tissues and organs of the embryo. Endoderm gives rise to certain organs including the colon, stomach, intestines, liver, lungs and pancreas. Mesoderm gives rise to heart, kidneys, gonads, genital ducts, cartilage, bones, muscles, blood cells, and other structures. Ectoderm forms the outer linings of the epithelium, brain, spinal cord, nerves, ears, nails and hair. Notochord arises from the mesoderm.

So the correct answer is B.