Question

Mesoderm produces
A) Brain
B) Heart
C) Urinary bladder
D) Middle ear

Answer 1

Hint:Mesoderm is one of three primary germ layers. Its formation starts in the embryo. Mesoderm gives rise to skeletal muscles, bone, connective tissue, the heart, and the urogenital system. In the classic view of bladder development, the trigone originates from the mesoderm.

Complete answer:
During this third week of the gastrulation, the period creates a mesodermal layer in between the other two layers i.e. endoderm and ectoderm. The mesoderm leads to the production of mesenchyme, mesothelium, coelomocytes, and non-epithelial blood cells. The lining of the coelom is of the mesothelium.

Mesoderm helps in the production of muscles with the help of a process known as myogenesis. Mesenchyme specifically takes part in the process of myogenesis. Intracellular signaling helps in the differentiation of mesoderm from the rest of the embryo. The interaction of endoderm and ectoderm leads to the formation of mesoderm. The evolution of the mesodermal layer initiates the development of visceral organs such as the stomach and intestine in triploblastic organisms. The embryos of simpler animals are not having a mesodermal layer.

The presence of mesodermal layer majorly occurs in the animals having bilateral symmetry (triploblastic animals) and lacking behind in animals such as cnidaria and Ctenophora which are having only two germ layers i.e. ectoderm and endoderm. The mesodermal layer plays an important role in animal development. Mesoderm is responsible for the production of numerous structures and organs within the developing embryo including the circulatory system, muscular system, skeleton system as well as lymphatic system.

Therefore the correct answer is option ‘A’ i.e, heart.

Note:The formation of the mesodermal layer occurs either by an interaction between both ectoderm and endoderm layers or by only one of the layers. The mesoderm is formed between the other two layers. As the heart is a part of the circulatory system, so it is made up of a mesodermal layer.