Rising Water

I love dis one...but it is not suitable to show to our students.....

ACTIVITY

Heat and Cold ..... you must feel it

 

 

 

 

 

The sensation of Heat and Cold is a matter of 'opinion'.
Try the next experiment and describe what you are feeling.

You will need three bowls of water.

1. The left one is filled with 'hot' (warm) water. Be careful. It must be safe enough to put your fingers in it without burning them. 
2. The middle one is filled with water of normal temperature.
3. The right bowl is filled with water and some melting ice cubes.
4. Now put your left hand into the left bowl. And your right hand into the right bowl. Hold it there for a few minutes. Wait until your body temperature has adjusted to the temperature of the water. 
5. Now put both your hands into the middle bowl.

That is funny...The water seems to be cold for your left hand, but warm for your right hand!!

Sensory Receptors 

 

The skin contains numerous sensory receptors which receive information from the outside environment.
The sensory receptors of the skin are concerned with at least five different senses: pain, heat, cold, touch, and pressure.

The five are usually grouped together as the single sense of touch in the classification of the five senses of the whole human body.
The sensory receptors vary greatly in terms of structure.
For example, while pain receptors are simply unmyelinated terminal branches of neurons, touch receptors form neuronal fiber nets around the base of hairs and deep pressure receptors consist of nerve endings encapsulated by specialized connective tissues.

Receptors also vary in terms of abundance relative to each other.
For example, there are far more pain receptors than cold receptors in the body.
Finally, receptors vary in terms of the concentration of their distribution over the surface of the body, the fingertips having far more touch receptors than the skin of the back. 

Sense of Touch

"The best and most beautiful things in the world cannot be seen or even touched. They must be felt with the heart."  

The sense of touch is our oldest, most primitive and pervasive sense.

It's the first sense we experience in the womb and the last one we lose before death.

The organ that is most associated with touch is the skin on the outside of your body.

And our skin, which has about 50 touch receptors for every square centimeter and about 5 million sensory cells overall, loves to be touched.

The nerve endings in the skin can detect pressure, pain, and temperature.

If you put your hand in a box to search around for something, you can tell when you've found it by feeling the pressure of the object.

The ability to sense pain is a warning device. It warns us to quickly pull our hand away from a hot stove, or not to grab hold of the wrong end of a pair of scissors.

The ability to sense temperature is a safety feature too. It reminds us to bundle up when we go out in winter weather, and to stop and cool off after exercising.

Your sense of touch allows you to tell the difference between rough and smooth, soft and hard, and wet and dry.

Some parts of your skin have more nerve endings that other parts, so some parts are more sensitive to touch than others are.

Your fingertips, tongue, and lips have the most nerve endings.

You do not only have skin and sense of touch on the outside of your body!

You also have 'skin' and touch sense in the inside of your body.

You can feel pain and feel that there is food in your stomach for example.

Or have a sore throat when you have caught a cold.

The World Through Our Senses

To All Frenz..harap2 dis blog akan membantu sedikit sebanyak dalam praktikum kita nanti...I'll share my everything in here including my lesson plan yg best2...or any activity yang boleh digunakan dalam P&P.

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