Question

The middle layer of skin is called
a. Epidermis
b. Dermis
c. Plasma
d. Cortex

Answer 1

Hint: The largest organ of the body is skin. It forms the outer covering of a vertebrate’s body that forms a protective covering for the body internally & externally.

Complete answer:
The skin is the largest organ of our body and it keeps refreshing. It's ever-changing, and it contains many specialized cells and structures. The skin's primary function:
a) Forms a protective barrier.
b) Interacts with the hostile environment.
c) Regulate body temperature.
d) Gathers sensory information from the surrounding.
e) Protect the body against diseases.
Layers of skin:
a) Epidermis
b) Dermis
c) Subcutaneous fat layer (hypodermis)

Epidermis	An outer thin layer of skin. Made up of 3 types of cells:Squamous cells- The layer formed by it sheds continuously and is called the stratum corneum. Basal cells – located just below the squamous cells.  Melanocytes- They are found at the base of the epidermis and make melanin pigment that provides colour to the skin.
Dermis	The dermis makes the middle layer of the skin. The dermis contains the following:Blood & Lymph vesselsHair folliclesSweat glands & Sebaceous glandsCollagen bundles & FibroblastsNerves
Subcutaneous fat layer	It is the deepest layer of skin. That consists of a network of collagen and fat cells. It conserves the body heat, acts as a shock absorber so protects the body from injury.

So, the correct answer is (B) Dermis.

Note: Skin is the layer that covers the body of an animal. It has three main functions associated with it: protection, regulation, and sensation. In mammals, the skin is an organ of the integumentary system made up of multiple layers of ectodermal tissue and guards the underlying organs. The skin interfaces with the environment form the first line of defence from pathogens. The thickness of the skin also varies from the location on an organism’s body. In humans, for example, the skin under the eyes is the thinnest & measures around 0.5 mm thick whereas the skin on the palms and the soles is the thickest skin of the body that measures about 4 mm thick.