Week 4. Tissues, Skin, Membranes Lab.

Part 1

Tissues Identification and Characterisation.

EPITHELIAL  TISSUE

This is epithelial tissue because the cells are organized and have a structure. They form the layers and have distinctive shapes: squamous, cuboidal, and columnar.

CONNECTIVE TISSUE

This is connective tissue because it have  a few living cells. It does have fibers, fat cells, and ground substance.

MUSCLE TISSUE

This is muscle tissue because it has long strands of muscle fibers which are long and thin. Also, the stands are usually positioned parallel to each other.

NERVOUS TISSUE

This is nervous tissue because it has a large (in comparison to other cells) body, it has the dendrites (extensions that spread out from the cell and receive the signals) and axon, (that transmits the signals).

Part 2.

Tissue Membrane

MUCUS

Part 3.

Body Position and Directional Panes.

a)

https://www.google.com/search

b)   My friend have a blister on the bottom (inferior) of her foot. In addition, it is located on the rear end of her foot (posterior). So, I would say, that she have a blister on her heel.

Part 4.

Skin Structure and Function.

1.  Duration of the sensation: about 4 seconds. 

2.  At a different location, the duration of sensation is the same, about 4 seconds. 

3/4.  After placing three more coins on the same location, the pressure sensation does return, but duration of it lasts for about 4-5 seconds. 

( i had an extra subject present for this experiment, but she didn't last long, so impatient   :) )

5.  I have fouond this simple video on how our skin receives its sensetion. 

http://www.sumanasinc.com/webcontent/animations/content/skinreceptors.html

Our sense of touch is controlled by a huge network of nerve endings and touch receptors in the skin known as the somatosensory system. This system is responsible for all the sensations we feel - cold, hot, smooth, rough, pressure, tickle, itch, pain, vibrations, and more. Within the somatosensory system, there are four main types of receptors: mechanoreceptors, thermoreceptors, pain receptors, and proprioceptors.

A touch receptor is considered rapidly adapting if it responds to a change in stimulus very quickly. Basically this means that it can sense right away when the skin is touching an object and when it stops touching that object. However, rapidly adapting receptors can't sense the continuation and duration of a stimulus touching the skin (how long the skin is touching an object).
This is why after about 4 or 5 seconds, we can't feel the couins on our skin. 

Appendages of the skin.

Work cited:

"Nose - Google Search." Nose - Google Search. Web. 18 Sept. 2015. <https://www.google.com/search?q=nose&rlz=1C1GGGE_enUS594US614&es_sm=122&source=lnms&tbm=isch&sa=X&ved=0CAcQ_AUoAWoVChMIp4uE17WByAIVwZQNCh3AuA8r&biw=1435&bih=744#tbm=isch&q=mucous glands in nose&imgrc=melaihEOHy_MQM:>.

 "Skin Cross Section - Google Search." Skin Cross Section - Google Search. Web. 18 Sept. 2015. <https://www.google.com/search?q=skin cross section&rlz=1C1GGGE_enUS594US614&espv=2&biw=1435&bih=744&tbm=isch&tbo=u&source=univ&sa=X&ved=0CBwQsARqFQoTCMGpirm8gcgCFQqPDQod_c8D9A#imgrc=OMUa_yxlDpIBzM:>. 

 "Sense of Touch." Skin & Sense of Touch. Home Science Tools. Web. 18 Sept. 2015. <http://www.hometrainingtools.com/a/skin-touch>.