Question

Which of these statements is NOT true about the heart?

• A. The heart is situated between the two lungs in the mediastinum.
• B. The heart is a pear shaped hollow organ.
• C. The apex of the heart always rests on the diaphragm.
• D. The heart develops from the ectoderm.

Answer 1

The correct option is D

The heart develops from the ectoderm.

The 3 germ layers - the ectoderm, the mesoderm, and the endoderm (endoderm) are in place at the end of gastrulation.

The Ectoderm gives rise to the central nervous system (the brain and spinal cord) etc.

The Mesoderm gives rise to connective tissue, cartilage, and bone; striated and smooth muscles and the heart walls etc.

The Endoderm gives rise to the tonsils, the thyroid gland, parathyroid glands, and thymus gland; the larynx, trachea, and lungs; the gastrointestinal tract, the urinary bladder etc.