Lesson 2 - SWEATING? TOUCHING?

HOW DO WE SWEAT??? WHAT DO WE DO TO SWEAT??   


Mechanoreceptors and Glands:

The four mechanoreceptors of the Integumentary System include: Merkel cells, Pacinian corpuscles, Meissner's corpuscles, and Ruffini corpuscles.
   Merkel cells: They are sensory receptors for touch. It lies on the Merkel disc. It lies at the epithelial-dermal junction.
    Pacinian Corpuscles: They are nerve endings that are sense vibration and pressure. It is very few in number and is 1mm in length. They can sense up to 250Hz.
    Meissner's Corpuscles: They are nerve endings that sense light touch. They can sense well between 10Hz and 50Hz.
    Ruffini corpuscles: It is found in the subcutaneous layer. It helps sense warmth. It is also known as Bulbous corpuscle.

Exocrine glands are glands that secrete out onto the environment directly.
Sudoriferous glands are sweat glands. There are two types: Apocrine and Eccrine glands.
    Apocrine glands: They are a type of sudoriferous gland. They are located at the junction between the subcutaneous layer and dermis. They are only located at the armpits, areola and nipples of breasts, and genital area. Their secretions have a odor.
    Eccrine glands: They are a type of sudoriferous gland. They secrete directly onto the skin. Their secretions are odorless.
Sebaceous glands are glands that secrete sebum. The secrete directly on the hair. Sebum inhibits bacterial growth on the skin.