Final answer:
While the term 'factor Z' does not correspond to a recognized biological factor and therefore cannot be answered directly, the heart is known to arise from the mesoderm layer during embryonic development, not from the ectoderm or endoderm.
Step-by-step explanation:
The student's question is about the presence of a hypothetical 'factor Z' in specific tissues and where it is normally bound to DNA. However, this question includes a term 'factor Z' which does not correspond to a recognized factor in the context of biology and seems to be a placeholder or fictional element introduced for the sake of the question. In real terms, there is no known 'factor Z' that can be accurately addressed. Nonetheless, if we look at the context provided for the germ layers that give rise to all adult tissues and organs, we can discuss related concepts.
The heart is derived from one of the three primary germ layers known as the mesoderm, not the ectoderm or endoderm. The mesoderm is the middle layer of the embryonic germ layers and is responsible for the development of the cardiovascular system, including the heart, as well as muscles, bones, and connective tissue. The ectoderm gives rise to the skin and nervous system, while the endoderm forms the lining of the digestive and respiratory systems.