The integumentary system is an organ system consisting of the skin, hair, nails, exocrine glands, and sensory nerves. what is mostly made of dense irregular connective tissue along with nervous tissue and gives the skin its strength and elasticity?

Skin

Explanation:

Skin  is made up of several layer of cells and tissue consisting of several nerve fiber such as sensory , autonomic, sympathetic etc.

However, the skin consists of two main layers

a)  the epidermis - An epidermis is composed of densely  packed epithelial cells

b) Dermis - A dermis is made of dense, irregular connective tissue comprising of numerous blood vessels, hair follicles, sweat glands, and other structures.

After the dermis , the layer of hypodermis is found which is made up of  loose connective and fatty tissues.

a unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring.