1. Agenda Announcements Do Now, hand back graded work (12) Notes (25)
Handout (20)
Announcements
UNIT TEST next Tuesday!!!
Homework packet due Friday
Mastery Quiz retakes: today during 5th, 6th in room 401
Stuff to copy: in magenta

2. Word of the Day!!!! Communication!
Our body absolutely HAS to communicate in order for homeostasis to happen!!!
What you just saw was how cells communicate!

3. Receptor molecules let cells communicate
In the cell membrane
Receive a message from a signal molecule
Have a specific shape x
Message
Message
Communication!

4. What messages have to be transmitted?
The Sensory System detects stimuli from the outside environment in 5 ways:
VISION
2. HEARING
3. TASTE
4. TOUCH
5. SMELL

5. What is a stimulus? (plural = stimuli)
A stimulus is something that causes (stimulates) a response in your body.
Example: Touching a hot stove will make you move your hand away quickly.
Pain is a stimulus

6. What happens to the information from the stimulus?
Sensory information (from stimuli) gets communicated by the nervous system
The nervous system:
1) tells your body how to respond to that information
2) maintains homeostasis
MAIN ORGANS
BRAIN, SPINAL CORD, NERVES

7. Differences? Axon, shape Similarities? Nucleus, membrane
How does the nervous system communicate? From the Do Now: A Nerve Cell (Neuron)
Nucleus
Axon endings
Cell Body
Axon
Axon
Axon
Dendrites
Differences? Axon, shape
Similarities? Nucleus, membrane

8. Nerves COMMUNICATE messages from the sensory system, to the brain, to other parts of your body

9. Nerves use receptors to COMMUNICATE
Nerves send out chemicals, called nuerotransmitters, that fit into receptors in cells x
Message
Message
Communication!

10. Wrap-Up…
Aim: What is the nervous system and how does it use receptors and nerve cells to transmit messages?
The nervous system COMMUNICATES!
It sends out nuerotransmitters that transmit messages to cells through receptors!

12. 3. The “ouch” signal is communicated by nerve cells (motor neuron) to the muscle. The muscle contracts in response.
How do reflexes work?
2.Message is passed along interneurons to the central nervous system (brain and spinal cord) which senses this message as PAIN
“OUCH”
1. A nerve cell senses (sensory neuron) the stimulus (the bee sting) and sends an electrical signal to the spinal cord.