BIOL 211 – CELLULAR AND ORGANISMAL
BIOLOGY
Lecture Outline for
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
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 (
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: