Final answer:
An injection in the arm would first go through the epidermis, then the dermis, and finally reach the hypodermis, following the order of 2) Epidermis, Dermis, Hypodermis. The epidermis serves as a barrier layer, while the dermis contains essential skin structures and is nourished by the hypodermis.
Step-by-step explanation:
To answer your question regarding the order in which an injection in the arm would go through the layers of the skin: It begins with the epidermis, proceeds into the dermis, and then reaches the hypodermis. Therefore, the correct order is option 2) Epidermis, Dermis, Hypodermis.
The relationship of the epidermis to the dermis is that of a protective outer layer to a supportive and nourishing inner layer. The epidermis serves as a barrier to water and pathogens, while the dermis contains blood vessels, sweat glands, hair follicles, and other structures. The basal layer is a part of the epidermis, which is responsible for generating new cells that move up to replace the older ones on the surface that are shed.
In the dermis, you can find important structures such as blood vessels, sweat glands, hair follicles, lymph vessels, and sebaceous glands. It is connected to the hypodermis, which serves as the connecting layer to the bone and muscle, providing nerves and blood vessels to the dermis and housing a significant amount of body fat.