Human skin

Your skin is the body’s first defense mechanism. A barrier against pathogens and water loss, the human epidermis undergoes a constant renewal process called cornification, as old dead skin cells, corneocytes, are shed and replaced by cells from the layers below to maintain constant protection. A defect in the skin barrier could develop various skin conditions, including atopic dermatitis. The most common form of eczema, atopic dermatitis is a chronic skin condition characterized by inflammation and

1.1. Anatomy and Function of Skin: The Human skin is the largest single organ of the body, with a surface area of one to two square meters and accounts for approximately 16% of total body weight. It protects the body as an outer barrier from external pathogenic factors and excessive water loss. The skin is composed of three main layers: the epidermis, dermis, and hypodermis or subcutaneous layer1,2. Epidermis: The epidermis is the outermost layer of mammalian skin and contains four types of cells:

NATIONAL CENTER FOR CASE STUDY TEACHING IN SCIENCE The Evolution of Human Skin Color by Annie Prud’homme-Généreux Life Sciences Quest University, Canada Part I – Skin Cancer “Stop it!” called Tatiana, playfully. Her boyfriend, Zach, was inspecting her skin very carefully. “Look,” he answered her, his voice taking on a more serious tone. “Today a woman walked into the clinic for her annual physical. Everything about her seemed fine. She leads a balanced lifestyle, she eats well, she exercises:

The human skin is the largest organ within the human body (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3535073/). The surface of the skin is formed by cross-linked cell envelopes and specialized lipid molecules creating the structure of the epidermis (NCBI). The human skin is slightly acidic (pH 5-6) which is beneficial for resident flora (Lambers). The human skin acts as a barrier which is one of the first lines of defense against harmful microbes, most commonly specialized immune cells help to

Introduction: Skin is not only the largest organ on the human body, but it is also the most prominent organ that is in the integumentary system. It works in many aspects of protecting the body underneath against the outside environment. The skin has three main layers; the epidermis, dermis and the hypodermis. Each layer have different physical attributes that aid the skin in its job to protect the organism. Purpose: This lab was done to help me understand the layers of the skin and their varying

variety of message. The hand consist of the skin, muscle, and bone. In order, for humans to grab or hold something - a hand is necessary. In our daily lives, we use our hands to write, to make things, to build models, and to do all sort of activities. As we dive deeper into the human body, we can discover how important it’s to have all our body part functioning and intact. As I stared at my hands, I noticed that all human beings have their own unique skin. People have different hand prints that

the results can be interesting from extinction to significant changes within a species. Human beings are no exception to biological evolution. Like other organisms around the world, humans have significantly changed overtime and have developed all sorts of diverse characteristics. One noticeable characteristic of human beings is the variation of skin

Skin, the largest organ in the human body covers the whole body. It has many function such as protecting as barrier against radiations, pathogens etc. Skin mainly consists of 3 layers, epidermis, dermis and hypodermis. Epidermis is the outer layer of the skin which is comparatively thin and tough. Epidermis does not have blood vessels and comprised of epithelial cells. Most of the cells in the epidermis are keratinocytes. Epidermis is originated from the deepest layer of the epidermis called basal

THE HUMAN SKIN MICROBIOME Throughout the millions of years of human evolution, humans and microorganisms have evolved side by side. In fact the cells of microorganisms out number human cells in the body. Some of the relationships between these microorganisms are mutualistic like Lactobacillus that helps the human body digest lactose and competes with pathogenic bacteria which boosts the immune system. Other bacteria that live in the human body are not beneficial but pathogenic. Salmonella is a

THE HUMAN SIGNIFICANCE OF SKIN      Skin is often over looked and under appreciated by all of us. We live our lives habitually without realizing what an amazing and important role skin plays in our every day routine. Our skin protects us from many things, keeps us informed of our surroundings and makes us aware of many dangers present. The sense of touch is our most developed feeling and the predecessor of all of our other senses. The author gives several examples on how