1. Topic: Nervous System
Aim: Explain the function of the nervous system.
Do Now:
Take out the ISA homework.
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.

2. Which gas regulates or controls your breathing rate?

4. 1. Describe the function of the nervous system.
Body’s control center
REGULATION
Maintains homeostasis

5. 2. Identify the electro-chemical messages in the NS.
Impulses
2. Identify the electro-chemical messages in the NS.

6. 3. Identify structures that detect changes in the environment.
Receptors

7. 4. Identify the changes in the environment detected by receptors.
Stimuli
4. Identify the changes in the environment detected by receptors.

8. Identify the stimulus. Support your answer.
The pin

9. Identify the stimulus. Support your answer.
The hammer

10. 5. Identify the sense organs receptors are located in.
Skin, tongue, ears, eyes, nose

11. 7. Identify the different types of receptors.
Mechanoreceptors
Photoreceptors
Thermo-receptors
Pain receptors
Osmoreceptors
Chemoreceptors

12. 4. Which stimulus does the skin detect?
Touch, pressure, pain and temperature
Mechanoreceptors
Thermo-receptors

14. The diagram represents the number temperature receptors in the skin throughout the body.
Identify the parts of the body that detect temperature the most?

15. 5. Which stimulus does your tongue detect?
Chemicals in food
Chemoreceptors

18. 6. Which stimulus do your ears detect?
Sound
Mechanoreceptors

20. 7. Which stimulus do your eyes detect?
Light
Photoreceptors

21. Let’s take a look at the structure of the eye.

22. In the dark
In the light

23. 8. Which stimulus do your nose detect?
Chemicals in the air
Chemoreceptors

24. What do one eye say to the other eye???????
There is something between us that smells.

25. A reaction to a stimulus
9 or 10. What is a response?

26. Watch the following video. Identify the response of the ship.

27. 8 or 10. Identify the structure that produces a response.
Effectors

28. 9 or 11. Identify three examples of effectors.
Muscle contracting to move an arm

29. Muscle squeezing saliva from a salivary gland

30. Gland releasing a hormone into the blood

32. Observe the animation. Identify the stimulus, receptor, effector and the response.

33. Path of an impulse
Receptor
Nerve cell
Effector

34. Describe the function of the nervous system.
Let’s summarize…
Describe the function of the nervous system.
2. What kind of message is an impulse?
3. Identify the change in the environment your body detects.
4. Identify the structures that detect stimuli.
5. Identify the reaction to a stimulus.
6. Identify the structures that produce a response.
7. Identify an example of an effector.
To regulate all life processes.
Electro-chemical
Stimulus
Receptors
Response
Effectors
Muscle or gland

35. A student accidentally places her hand on a tack and quickly pulls her hand away. The tack represents
A stimulus
An impulse
A response
An effector

36. Structures that detect stimuli are called
impulse
responses
effectors
receptors

37. Structures that produce a response to a stimulus are called
impulse
responses
effectors
receptors

38. A change that initiates an electrochemical message along a neuron is known as
a stimulus
a response
an impulse
a synapse

39. 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)
stimulus
response
effector
receptor

40. Adding one drop of dilute hydrochloric acid to the water surrounding a hydra caused the hydra to contract. The acid acted as
a response
a stimulus
a neurotransmitter
an impulse

41. Homeostasis in living things is regulated by the action of
The nervous system, only
The endocrine system, only
Both the nervous and endocrine systems
Neither the nervous nor the endocrine system