TISSUES, SKIN, MEMBRANES LAB

PART 1


Epithelial Tissue

Epithelial tissue offers protection and creates linings all over the body.  Their tightly packed cells are ideal for these functions.


Connective Tissue

Connective tissue has fat vacuoles for cushioning and strong matrixes that offer support, storage and strength to organs and other body parts.


Muscle Tissue

Muscle tissue consist of long (for the most part) and thin fibers that are excellent for contracting.


Nervous Tissue

Nervous tissue sends electric impulses to different regions of the body.  Their dendrites and long axons are like lighting rods accepting impulses and sending them on their way quickly.



PART 2


Serous Membrane

Mucous Membrane

Synovial Membrane

Cutaneous Membrane

PART 3

1. A friend tells you she has a blister on the inferior surface of her foot.  She adds that it is posterior, not anterior.  Where is her blister?

Her blister is on the bottom of her foot, towards her heel.

2.

PART 4

Visualizing changes in skin color.

What would happen if in this area the pressure continued for an extended period of time?

Since pressure slows down blood flow, if there was extended pressure the epidermis would eventually die from lack of blood delivery.


Testing tactile locations and adaptation.

Table 1

Palm          Fingertip          Forearm          Back of Hand

45mm        30mm              85mm              60mm


In the tactile location exercise, which area had the smallest error of localization?

For my subject the area of the smallest localization was the fingertip.  I think this was because the area was much smaller than the rest of the locations, so it was easier to pinpoint.

Coin experiment:

Do a bit of research to learn if the same receptors being stimulated when the four coins, rather than the one coin is used.  What is your conclusion?

The Meisner corpuscles are being stimulated when one quarter is placed on the forearm.  When the four quarters are placed on the forearm, the Pacinian corpuscle may be stimulated.  However in my experiment that didn't seem possible, since the weight of the four coins was not that great and it would likely require a deeper touch to stimulate the Pacinian.


Appendages of the skin.

The action of UV light.

What kind of sunscreen or sunblock do you use and how frequently?

I use UVA/UVB 30 sunblock everyday.  I am pretty light skinned.

What does the production of more melanin tanning mean?

It means that the skin is being exposed to the sun and the keratinocytes in the dermis is creating more melanin to protect it.