But even if you damage a hair to the point of falling out, the same hair follicle will produce a new one to take its place.
Create an account to start this course today. Human Body 101 The human body performs amazing feats every day, from sending signals rocketing through the brain at high speed to distributing oxygen over 1,000 miles 1,600 kilometers of airways. The dermis lies underneath the epidermis and contains skin appendages: Skin cells grow and divide in the basement membrane. The subcutis contains fat cells and some sweat glands. What is Bradykinin? The best hair-care advice for a biology wonk is this: If this is a problem, apply your antiperspirant and walk around shirtless until it dries.
But take longer strands of hair or some slow-growing body hair and you can easily put the last year of your life under the microscope.
What is the Function of the Integumentary System? Cancer of melanocytes is called melanoma and can be deadly if not treated early. Merkel cells are involved in sensation, and Langerhans cells have cytoplasmic processes extending outward to detect foreign invaders.
Of course, some mattress covers are about as comfortable as sleeping on a vinyl tablecloth. If you really must feed your paranoia, obsess about something more serious, like bed bugs see http: Always wear a wide-brimmed hat, long-sleeved shirt, and long pants on sunny days.
You need surprisingly little exposure to the sun to maintain a healthy supply of vitamin D. Note In the not-so-distant past, tans were a sign of low-class laborers who had to toil in the fields to make a living.
As far as biologists can tell, Demodex is a harmless traveler. So a blockage deep in a sebaceous gland causes acne, which itself is usually caused by the sudden onrush of hormones at puberty.
Upgrade to Premium to add all these features to your account! Cigarette smoke damages skin, causing it to wrinkle prematurely.
It looks like a coiled tube that sits in the dermis where your body produces sweat and opens out through a pore.