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.

Which gas regulates or controls your breathing rate?

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

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

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

4. Identify the changes in the environment detected by receptors. Stimuli 4. Identify 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 stimulus does the skin detect? Touch, pressure, pain and temperature Mechanoreceptors Thermo-receptors

The diagram represents the number temperature receptors in the skin throughout the body. 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.

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

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. Identify three examples of effectors. Muscle contracting to move an arm

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

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

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

Structures that detect stimuli are called impulse responses effectors receptors

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

A change that initiates an electrochemical message along a neuron is known as a stimulus a response an impulse 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) stimulus response effector receptor

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

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