Join for Free!
121440 members

Question about "Skin"

Discussion of all aspects of cellular structure, physiology and communication.

Moderator: BioTeam

Question about "Skin"

Postby reyrey389 » Mon Nov 21, 2011 6:28 am

Why is it that the skin doesn't bleed when we scratch it?

Is it because no blood vessels are present?...
Posts: 18
Joined: Sun Oct 30, 2011 6:42 am

Postby JackBean » Mon Nov 21, 2011 6:56 am

depends how much will you scratch it. If you scratch it only on the top, without damaging it, it won't bleed of course. Otherwise you would loose blood all the time in nature and predators could easily hunt you. But when you scratch it deeply, then it will bleed.
Look on picture of cross-section of skin, that could help you to find answer (how old are particular cells and whether are they viable).

Cis or trans? That's what matters.
User avatar
Inland Taipan
Inland Taipan
Posts: 5694
Joined: Mon Sep 14, 2009 7:12 pm

Postby daniel.kurz » Mon Nov 21, 2011 6:58 am

Skin is a multi-layered "organ" that makes up the covering of our body. When we scratch our skin we are really just touching the epidermis of our skin, which is the outer most skin layer. We slough off some cells as well as bacteria and fungi that are hanging out on our skin. If we scratch hard enough or scrape of against something we can get an abrasion or a laceration where the scratch goes down to the dermis and hyperdermis where we have capillaries that may be ruptured and release blood.
Posts: 167
Joined: Fri May 19, 2006 1:47 am

Return to Cell Biology

Who is online

Users browsing this forum: No registered users and 1 guest