Deep lying cells in hair roots move forward through the hair follicles or shafts that hold the hair fiber. The integumentary system accessory structures.
1 Chapter 5 Integumentary System What Does Integument Mean Covering Components Skin Hair Nails Glands Ppt Download
Skin skin is only a few millimeters thick but is still the largest organ in the body.
Integumentary system hair and nails. The integumentary system cov ers the outside of the body. Strands of hair originate from the base of the downward extension of living epithelial cells into the dermis that is called the hair follicle. The word integument means covering.
Integumentary system hair skin nails and exocrine glands danielle silva the body s largest organ. Hair chapter 18 lesson 16 transcript. Hair is part of the integumentary system.
The integumentary system is an organ system consisting of the skin hair nails and exocrine glands. Nails next lesson the integumentary system accessory structures. One tiny involuntary muscle is attached to each hair.
The integumentary system hypodermis epidermis callus skin color hair glands nails. A hair fiber is composed of a network of horny cells hold your giggles please filled with hard protein called keratin. The integumentary system consists of the skin hair nails the subcutaneous tissue below the skin and assorted glands.
Similar to the skin hair forms by rapid division and differentiation of stem cells which form keratinocytes that migrate flatten and die forming keratinized cells. These are all exocrine glands secreting materials outside the cells and body. The skin is only a few millimeters thick yet is by far the largest organ in the body.
Hair follicles are surrounded by the dermis but the cells are part of the epidermis and are separated from the dermis by basal lamina layer. The average person s skin weighs 10 pounds and covers a surface of about 20 square feet. Hair growth is similar to the growth of the epidermal layer of the skin.
The average person s skin weighs 10 pounds and has a surface area of almost 20 square feet. The most obvious function of the integumentary system is the protection that the skin gives to underlying tissues. Integumentary system structures that decrease heat loss protect the scalp from sunburn filter air keep foreign particles out of the eyes and inner ear.
Hair is a component of the integumentary system and extends downward into the dermal layer where it sits in the hair follicle. They are part of the integumentary system which includes your skin and all its accessory structures like nails hair and sweat and oil glands. It protects internal structures prevents the entry of infectious agents reduces water loss regulates body temperature produces vitamin d and detects stimuli.