BIOL 211 – CELLULAR AND ORGANISMAL BIOLOGY

Lecture Outline for April 20, 2005

 

Topic: nervous system (sensory systems in animals)

Chapter 31 sections 31.1. 31.2, 31.3, 31.4

Figures used in lecture: 31.2, 31.3, 31.4, 31.5, 31.8, 31.9, 31.11, 31.15

Additional Resources:

                Structure of the Neuron – includes a link to a self-quiz on neuron structure

                The Nervous System

 

Sensory Systems in Animals – Nerve Signals

Define/explain: sensory neuron, motor neuron, central nervous system, peripheral nervous system, reflex, neuron, dendrite, axon, membrane potential, resting potential, action potential, depolarization, repolarization, neurotransmitter

 

You should be able to:

1.  Describe the anatomy of the central and peripheral nervous systems.

2.  Describe the anatomy of a neuron.

3.  Describe the events that take place to move an electrical signal through a neuron.

4.  Explain and compare the different sensory systems of a sea anemone, a roundworm, and a human.

 

Today’s Lecture (4-20-05)

 

Nervous System

Functions:

 

 

Levels of Organization:

1.  Nerve Net

 

 

2.  Nerve “ladder”

 

     Ganglion (pl. ganglia):

 

 

3.  Nervous system

 

 

Cephalization

 

 

Neurons:

 

 

Types of Nervous Systems:

1. Central Nervous System (CNS)

 

2. Peripheral Nervous System

 

 

Anatomy of a neuron

 

Cell body:

 

Dendrites:

 

Axon:

 

Axon terminal:

 

 

Transmission of Information

Sensory receptor:

 

Sensory neuron:

 

Motor neuron:

 

Effector cell:

 

Reflexes

 

 

Principles of Electrical Signaling

Resting potential:

 

Action potential:

 

 

Depolarization.

 

 

Repolarization.

 

 

Neurotransmitters: