Some Like it HOT.....or Cold
You be the Judge

By:
Amanda Celii, Donald Baranowski, and Keith Hoffman
What will you be doing at Kids Judge:
- We
will have 3
containers of water, one with warm water (about 45 degrees Celsius or
113 degrees Fahrenheit),
one with cold water (about 4 degrees Celsius or 40 degrees Fahrenheit),
and one neutral or room
temperature (about 25-30 degrees Celsius or 77-86 degrees Fahrenheit)
- How do
you convert from Celsius to Fahrenheit??
- How
warm is the warm water? It does not have to be super hot! We do not
want anyone to get burned
- The
warm water would feel like you were taking a warm bath
- You
will stick
you left hand in the warm water and your right hand in the cold water
- Leave
your
hand in the water until it adjust to the temperature and it feels
neutral/normal
- You
will then
quickly put your hands into the middle container of neutral water
- Which
hand is
cold now and which hand is warm???????
- the
hand that was in the warm water will now
feel cold
- the
hand that was in the cold water will now
feel warm
Why did this happen??:
- The
temperature of the hand is raised from normal when it is in the warm
water
- This
feeling of warmth, then turns to a normal
feeling because you leave it in there so long
- When
you move this hand into the room temperature
water, this lowers the temperature of the hand back back to what it
normally is and makes it feel cold because your hand temperature had
been raised
- The
increase of the temperature in the warm water
turns on cold receptors and turns off warm receptors
- When
the hand is placed in the cold water, the
temperature is lowered from normal to a lower temperature
- When
the feeling of cold goes away, and a normal
feeling returns because your hand has been in there so long this is
called adaptation
- When
you move this hand into the room temperature
water, this increases the temperature of the hand and makes it feel warm
- The
decrease in temperature in the cold water turns
on warm receptors and turns off cold receptors
What is a receptor that feels this??:
- These
receptors are called thermal receptors
- There
are some that respond to warmth and some that
respond to cold
- These
receptors are in your skin
- These
receptors send the information of what they
are feeling to the brain through action potentials
- Want
some more information on these receptors- visit the tutorial below!
- Where
are these receptors in your body?- All over!
- there
are more of these receptors in some parts than others
Picture
from: http://www.ott.doe.gov/coolcar/strategies.html
- There
are many kinds of receptors in your skin with different receptor endings
- To see
pictures of them all visit Skin
Receptors- Different Receptor Endings
- The
free nerve endings are another name for the thermal receptors discussed
above
- Free
nerve endings can detect thermal stimuli
- There
are actually 4 kinds of skin
- Mucocutaneous:
at the junction of the mucous membrane, hairy skin, lips, and tongue
- Mucous
Membrane: lining the inside of body orifices
- Glabrous:
skin without hair
- Hairy:
skin with hair

- the
free nerve endings in this picture are the thermal receptors- they
detect thermal stimuli
Picture
from:
http://kameras.ucsd.edu/~ffilimon/107B/skinreceptors.jpg
- Where
does this information go to in the brain?
- It
goes through our spinal cord up into our brains
- It
goes to the Somatosensory Cortex
From:
http://faculty.washington.edu/chudler/twopt.html
What worked for Kid's Judge?
- The negative afterimage
buttons that we made (of the flags and stop sign) were a big hit.
- Get excited, they get excited
the more you are!
- Don't get too technical, but
explain the basic behind the hot and cold idea because they are there
to learn
- The presentation we did were
they stared at the red light for 20 seconds, then looked in their hand
and saw a green dot, then looked at the wall and the dot got bigger
- we then flashed the lights
on and off and the dot went from green to red, back to green
- we then ran out in the
hallway and looked at the dot and it was really big
- this is why the moon
looks big