Question

select the correct answer.
some patients with coronary artery disease require a heart transplantation. as an alternative, daisy is working to produce healthy heart cells from embryonic cells. from which part of an embryo would daisy derive cells that could eventually become heart cells?
a. trophoblast
b. mesoderm
c. endoderm
d. ectoderm

Explanation:

To solve this, we analyze the germ layers:

• Trophoblast (A) forms placenta, not heart cells.
• Mesoderm (B) gives rise to muscle (including heart), circulatory system, etc.
• Endoderm (C) forms digestive/respiratory linings.
• Ectoderm (D) forms skin, nervous system.

Heart cells come from mesoderm.

Answer:

B. mesoderm