Question

Response 1:

• Explain the 3 germ layers and tell one part/organ that arises from each layer

Response 2:

• Include 2 developmental changes associated with aging.

Answer 1

Question no 1)

The body is primarily made of 3 cell layers. Which are formed in embryonic development.

The three layers are

1. Endoderm the inner layer
2. Mesoderm the middle layer
3. Ectoderm the outer layer

These are some specific cells that is multipotent cell with specific characteristics that develops into many organs, tissues and blood vessel etc

1. It is called the endoderm because it is the innermost layer of the germ layes president in our human embryonic stage .internal lining of the body are mainly developed from endoderm. Endoderm gives rise to some colonic organs like stomach , pancreas etc

2)mesoderms is called so as it is the middle layer . It lies in between the endoderm and the ectoderm.mesoderm is the structure that helps in making big hollow cavities in human body as well as make some organs float in fluid to protect them .The main organs like the heart and the muscle system and bones are developed by mesoderms.

3) ectoderm is the outermost layer of embryonic development stage . The precursor to many organs including the mammary gland is the mesoderms. The hair outer skin layer is developed from the ectoderm.

Question no 2)

Development changes associated with aging.

The musculoskeletal system become weak with the progression of age . Difficult in Mobility start's to take place .

Degeneration of the nervous system take solace with aging and many diseases like Alzheimer's takes place

The immune system start's to become weak and the ability to resist against pathogens reduces