You are not a member of this wiki.
Pages and Files
Assessment of Students' Contributions.
1.1 Sensory Organs and Their Functions
1.2 The Sense of Touch
1.3 The Sense of Smell
1.4 The Sense of Taste
1.5 The Sense of Hearing
1.6 The Sense of Sight
1.7 Light and Sight
1.8 Sound and Hearing
1.9 Stimuli and Responses in Plants
2.1 The Classes of Food
2.2 Balanced Diet
2.3 Digestive System in Man
2.4 The Process of Absorption of Digested Food
2.5 The Reabsorption of Water and Defection
2.6 The Habits of Healthy Living
1.2 The Sense of Touch
is the sensory organ for
and is also the largest organ in the human body. Changes in
can be detected by the skin. There are special receptors used to detect each of these stimuli.
1) Slight pressure is detected by the
detect the slightest pain as they lie very close to the surface of the skin.
are sensitive to heat.
4) The cold is detected by
are only sensitive to heavy pressure as they lie deep within the skin.
Impulses are sent along the nerves to the brain when the receptors are stimulated. The brain interprets the impulses as the sensation of touch.
A great deal of human activity depends on the sensitivity of the
. For example :
1)A mother tests the temperature of her baby's milk by placing a few drops of it on the back of her hand.
2)A carpenter uses his to
whether the piece of wood he is working on is smooth enough.
The sensitivity of the skin depends a lot on how
area and how deep they are.
For example,our fingertips are very
. They have
that lie very close to the skin's surface. Our tongue,nose and lips are also very sensitive to touch.
1)The pain receptors are located in the epidermis of the skin
2)The touch, heat, and cold receptors are located in the dermis of the skin
3)The pressure receptors are found in the fatty layer
a)Our fingertips, the lips, the tongue, the nose and the neck are more sensitive to touch
b)The legs, the elbows , the soles of the feet and the back of the body are less sensitive
Our skin is 2mm thick. The epidermis is made up of dead cells, which are waterproof. It is also protective layer which prevents entry of bacteria
a) When a stimulus is detected, the receptors sends impulses to the brain
b) The brain interprets these impulses as the sensation of touch and then will send suitable messges to effectors on how to react
The skin is the sensory organ for touch and is the largest organ in the human body.The skin detects
temperature, pain, touch and pressure
. Our skin is 2mm thick. The epidermis is made up of dead cells, which are waterproof. It is also protective layer which prevents entry of bacteria
Our skin consists of 3 main layers which are the
epidermis, dermis, and the fatty layer
.In the skin there are sweat glands, nerves, an the oil gland.Besides all this, there are many receptors that help us detect
heat, cold, pressure, pain and touch
(taken from Abdul Rauf =p, no nice pictures can be found)
are sensitive to a slight pressure and are located at the top of the dermis.
are sensitive to pain.They are located at the top of the skin in the epidermis area to detect pain.
are sensitive to heat and is located in the dermis.
are sensitive to cold and is located in the dermis.
detect pressure. For example, you feel pressure when carrying something heavy.Pressure receptors are located in the fatty layer deep into the skin.
When the receptors are stimulated, they send impulses to the brain.The brain interprates the impulses and sends them back along the nerves to the body to make a response.
The skin’s sensitivity depends on the number of receptors per unti area and the thinkness of the epidermis. Different parts of the body have a different level of sensitivity. The fingertips and the neck are very sensitive areas of the skin whereas the elbow, forearm and hip are less sensitive to touch.
Blind people rely on the sense of touch on the fingertips to read.They read in using the braille system. Thi systems uses raised dots to represent numbers and alphabets.
The skin is the sensory organ for
. The skin is the
in the body. The skin can detect changes in temperature, pain, touch and pressure.The epidermis is a though and water resistant layer that limits water lost.The epidermis also protect the sensitive cells under it and prevents the entry of germs into your body
The pain receptors are located in the epidermis layer. The touch, heat, cold, receptors are located in the dermis. Pressure receptors are located in the fatty layer.In the skin there are also sweat glands, nerves, an the oil gland.
There are five receptors in the skin.
a)pressure receptors - help us feel pressure
b)pain receptors - help us feel pain
c)touch receptors- help us feel slight touch
d)heat receptors - help us feel heat
e)cold receptors - help us feel cold
The receptors stimulate impulses along the nerves to the brain. The brain interprets the impulses as the sensation of touch.
1) The human skin has two main layers:
- The epidermis is the outer layer of the skin, the epidermis itself is divided into three layers
- The outer most layer of the epidermis is the dead cell
The epidermis is a tough and water resistance layer that limits water loss
- Epidermis also protects the sensitive cells under it and prevents the entry of germs into your body
- The dermis is the inner layer of your skin
There are glands, receptors and blood vessel in the dermis
- There are two glands in the dermis, which are sweat gland and sebaceous gland
- There are five receptors in the dermis, which are pain, pressure, heat, cold and touch receptors.
Receptors of your skin
- Cold receptors are sensitive to cold
- Heat receptors are sensitive to heat
- Pain receptors are the nearest to the epidermis. There are actually nerve endings.
- Touch receptors are sensitive too slight pressure and sensitive to touch
- Pressure receptors are sensitive to pressure
help on how to format text
Turn off "Getting Started"