1. Bio 9A: Monday, January 25, 2010 Title: Cell Specialization, Part 2
Homework:
Read Section 35-2 (pgs ). and take notes using active reading strategies – see assignment sheet for details.
Do Now:
Look over your midterm exam
In your notebook, write down:
One thing you did well
One thing you could have improved on
Any questions you have about the midterm
Today’s Objectives:
Review the Midterm Exam and answer MAJOR questions (individual issues need to be discussed after school)
Describe how different types of cells have different structures to fit their functions

2. Today’s Agenda Review Midterm Exam results
Class and grade results
Major questions you have
Cell Specialization Investigation
Worksheet w/ a partner
Class discussion & brief notes

3. Midterm Exam Results Class Data Graphed Class Median Grade: 79
Class Average Grade: 76
Class Median Grade: 79
9th Grade Average Grade: 76
9th Grade Median Grade: 79
Class Data Graphed
Number of 9A Students with each exam score
Grade on Midterm Exam

4. Investigate Cell Specialization Specialized Cells have Specialized Structures
“Typical” Cell
“Mystery” Cell
Objectives for Class:
Describe how different types of cells have different structures to fit their functions
Identify 3 specialized structures of neurons that allow them to receive and transmit signals throughout the body

5. PHA Biology 9 Moretti and Dickson
The Nervous System
PHA Biology 9
Moretti and Dickson

6. Neurons Neuron = a specialized nerve cell
Function: communicate with body organs by sending electrical signals (impulses)
Structure:
Long branches send and
receive signals
Cell body coordinates
incoming and outgoing signals

7. Neurons: Structure and Function
Dendrites: branched extensions, carry impulses toward cell body
Cell Body:
nucleus & organelles
Axon: Takes impulses away
from cell body
Objectives for Class:
Describe how different types of cells have different structures to fit their functions
Identify 3 specialized structures of neurons and explain that allow them to receive and transmit signals throughout the body

8. Bio 9A: Tuesday, January 26, 2010 Title: The Nervous System
Homework:
In notebook – 2 paragraphs summarizing class notes (see assignment sheet for details…)
How do the brain, spinal cord, sensory nerves, and motor nerves work together to sense and respond to a stimulus?
How does the structure of a neuron fit its function?
Do Now:
What is the difference between a dendrite and an axon?
How do they relate to the overall function of a neuron?
Today’s Objectives:
Identify the 2 major divisions of the Nervous System and their major components
Explain how neurons receive and send messages

9. This week… Today: Notes on the Nervous System
Thursday: Reaction Time Lab!
Friday: Wrap up this unit with a short open-notes quiz on the nervous and musculoskeletal systems.
Next week… Genetics!!

10. Nervous System: Major Divisions Working Together
Objectives for Class:
Identify the 2 major divisions of the Nervous System and their major components

11. Nervous System: The 2 Major Divisions
Central Nervous System = Brain and spinal cord
Brain: Processes information, controls responses
Spinal cord: Links brain to other nerves, controls reflex responses.
Peripheral Nervous System = All other nerves throughout the body
Motor nerves send info from brain to muscles
Sensory nerves send info from sense organs to brain
Image: Adam, Inc.;
Objectives for Class:
Identify the 2 major divisions of the Nervous System and their major components

12. Nervous System: Major Divisions Working Together
Objectives for Class:
Identify the 2 major divisions of the Nervous System and their major components

13. Review: Neuron Structure and Function
Dendrites: branched extensions, carry impulses toward cell body
Cell Body:
nucleus & organelles
Axon: Takes impulses away
from cell body
Objectives for Class:
Describe how different types of cells have different structures to fit their functions
Identify 3 specialized structures of neurons and explain that allow them to receive and transmit signals throughout the body

14. Neurons: Structure and Function
Axon
Cell Body
Dendrites
Objectives for Class:
Describe how different types of cells have different structures to fit their functions
Identify 3 specialized structures of neurons and explain that allow them to receive and transmit signals throughout the body

15. Neurons: Structure and Function
Objectives for Class:
Describe how different types of cells have different structures to fit their functions
Identify 3 specialized structures of neurons and explain that allow them to receive and transmit signals throughout the body

16. Nerve Impulse: A “wave” of electricity that travels through the neuron
3 Steps of a Nerve Impulse:
Dendrites are stimulated by a stimulus (environment or other neuron).
Electric impulse travels to cell body.
Cell body sends an impulse down the axon to the axon terminals.
Stimulus!
(Sound, smell, sight, taste, another neuron’s signal)
Objectives for Class:
Identify 3 specialized structures of neurons and explain that allow them to receive and transmit signals throughout the body

17. The “wave” of a nerve impulse:
Objectives for Class:
Identify 3 specialized structures of neurons and explain that allow them to receive and transmit signals throughout the body

18. Neurons communicate with other cells…
Other neurons
Muscle cells
Brain cell
Motor neuron
Muscle cell
Synapse:
The place where a neuron connects to another cell
Motor neuron

19. Communication At the Synapse:
Axon terminal releases neurotransmitter (a tiny signal molecule).
Neurotransmitter diffuses across synapse and signals the next cell.
This triggers an impulse in the next cell.
Objectives for Class:
Identify 3 specialized structures of neurons and explain that allow them to receive and transmit signals throughout the body

20. Objectives for Class:
Identify 3 specialized structures of neurons and explain that allow them to receive and transmit signals throughout the body

21. Bio 9A: Thursday, January 28, 2010 Title: Reaction Time Lab
Homework:
Prepare notes for the quiz tomorrow – you can use anything written on your lab packet (see back page).
Do Now:
What is the difference between a sensory neuron and an motor neuron?
How does a neuron signal a muscle cell?
Today’s Objectives:
Measure how fast your nervous & muscle systems can react to a falling meter stick
Explain how the nervous and musculoskeletal systems work together to make you move!

22. Agenda Reaction Time Lab: HW: Notes to prep for quiz tomorrow.
Review Do Now.
Reaction Time Lab:
Intro & Review Procedure (as a class)
Pre-Lab Questions (with your partner)
Choose Roles and Do Part I
Switch Roles and Repeat Part I
Do Part II (make a data table, experiment, then switch roles)
Answer the Post-Lab Conclusions  These must be completed in class!
HW: Notes to prep for quiz tomorrow.
GOAL: Explain how the nervous, muscle, and skeletal systems work together to make you catch a falling meter stick.