Topic: Nervous System
Aim: Explain the function of the nervous system.
Do Now:
1. Take out the ISA homework.
2. Which GAS (CO2 or O2) do you think controls
your breathing rate? Observe the diagram on
the next slide and discuss this with your
neighbor.
HW: Introduction to the NS worksheet
Castle Learning Respiratory and Excretory
Systems due Tuesday, March 1st.
Which gas regulates or controls your
breathing rate? CO2
1.
• Body’s control center
Describe
• REGULATION
the
function • Maintains homeostasis
of the
nervous
system.
2.
Identify
the
electrochemical
messages
in the
NS.
• Impulses
3. Identify
structures
that detect
changes in
the
environment.
• Receptors
4. Identify • Stimuli
the changes
in the
environment
detected by
receptors.
Identify the stimulus. Support your answer.
•The pin
Identify the stimulus. Support your
answer.
•The hammer
5. Identify
the sense
organs
receptors
are located
in.
• Skin, tongue, ears,
eyes, nose
7. Identify the different types of receptors.
• Mechanoreceptors
• Photoreceptors
• Thermo-receptors
• Pain receptors
• Osmoreceptors
• Chemoreceptors
4. Which • Touch, pressure, pain
stimulus
and temperature
does the
•
Mechanoreceptors
skin
detect? • Thermo-receptors
The diagram
represents the
number
temperature
receptors in the skin
throughout the body.
1. Identify the parts
of the body that
detect temperature
the most?
2. Identify the parts
of the body that
detect temperature
the most?
5. Which
stimulus
does your
tongue
detect?
• Chemicals in food
• Chemoreceptors
6. Which
stimulus
do your
ears
detect?
• Sound
• Mechanoreceptors
7. Which
stimulus
do your
eyes
detect?
• Light
• Photoreceptors
Let’s take a look at the structure of the eye.
In the dark
In the light
8. Which
stimulus
do your
nose
detect?
• Chemicals in the air
• Chemoreceptors
What do one eye say
to the other
eye???????
There is something
between us that smells.
9 or 10.
What is a
response?
• A reaction to a
stimulus
Watch the following video.
Identify the response of the
ship.
http://www.youtube.com/watch?v=qliI4LXdqpQ
8 or 10.
Identify
the
structure
that
produces a
response.
• Effectors
9 or 11. • Muscle contracting
Identify
to move an arm
three
examples
of
effectors.
• Muscle squeezing saliva from
a salivary gland
• Gland releasing a hormone
into the blood
Observe the animation. Identify the
stimulus, receptor, effector and the
response.
Path of an impulse
Receptor
Nerve cell
Effector
Let’s summarize…
1. Describe the function of the nervous system.
To regulate all life processes.
Electro2. What kind of message is an impulse?
chemical
3. Identify the change in the environment your
body detects. Stimulus
Receptors
4. Identify the structures that detect stimuli.
5. Identify the reaction to a stimulus. Response
6. Identify the structures that produce a
response. Effectors
7. Identify an example of an effector.
Muscle or gland
A student accidentally places
her hand on a tack and
quickly pulls her hand away.
The tack represents
1. A stimulus
2. An impulse
3. A response
4. An effector
Structures that detect stimuli are
called
1. impulse
2. responses
3. effectors
4. receptors
Structures that produce a response
to a stimulus are called
1. impulse
2. responses
3. effectors
4. receptors
A change that initiates an
electrochemical message along
a neuron is known as
1. a stimulus
2. a response
3. an impulse
4. a synapse
When a child runs to his mother
after hearing a clap of thunder,
the clap of thunder would serve
the nervous system role of
acting as a(n)
1. stimulus
2. response
3. effector
4. receptor
Adding one drop of dilute
hydrochloric acid to the water
surrounding a hydra caused the
hydra to contract. The acid acted
as
1. a response
2. a stimulus
3. a neurotransmitter
4. an impulse
Homeostasis in living things is
regulated by the action of
1. The nervous system, only
2. The endocrine system, only
3. Both the nervous and
endocrine systems
4. Neither the nervous nor the
endocrine system