Transcript 9.5 & 9.11 PP - Mrs. heninger

Unit 3: Integration Station: The Nervous System
THE NERVOUS SYSTEM
Chapter 9
Part 1: Organization of the Nervous System
Part 2: Nervous Tissue: Structure & Function
Part 3: The Synapse
Part 4: Peripheral Nervous System
Part 5: Developmental Aspects of the Nervous System
& Drug Use
Human Anatomy & Physiology
The Nervous System
Part 3: The Synapse
Unit 3: Integration Station: The Nervous System
Unit 3: Integration Station: The Nervous System
9.5
AGENDA
Do Now
Introduction
Mini-Lesson
Summary
Work Period
Exit Slip
Aim: What is a signal transmission?
Objective:
I will identify the general parts of a
synapse and describe a signal
transmission.
SC.912.L.14.24
Do now:
Think Ink…Pair Share
Unit 3: Integration Station: The Nervous System
9.5
AGENDA
Do Now
Introduction
Mini-Lesson
Summary
Work Period
Exit Slip
Aim: What is a signal transmission?
Real-world connection
How drugs interact with
the nervous system.
Vocabulary
nerve pathways, synapse,
synaptic cleft, synaptic
transmission,
neurotransmitters, resting
potential, action potential,
reflex arc, receptor, sensory
neuron, interneuron, motor
neuron, effector.
Axons and Nerve Impulses
 Nerve impulses travel along complex
nerve pathways.
 The junction between any two
communicating neurons is called a
synapse.
 The neurons are not in direct contact,
but are separated by a gap called a
synaptic cleft.
Unit 3: Integration Station: The Nervous System
Slide 7.11
Nerve Impulses
 The process of
crossing the synaptic
cleft with a message
is called synaptic
transmission.
 Synaptic
transmission is a one
way process using
chemicals called
neurotransmitters.
Unit 3: Integration Station: The Nervous System
Unit 3: Integration Station: The Nervous System
9.11
AGENDA
Do Now
Introduction
Mini-Lesson
Aim: What is a reflex arc?
Objective:
I will identify the parts of a reflex arc.
SC.912.L.14.23
Summary
Work Period
Exit Slip
Do now:
Unit 3: Integration Station: The Nervous System
9.11
AGENDA
Do Now
Introduction
Mini-Lesson
Summary
Work Period
Exit Slip
Aim: What is a reflex arc?
Real-world connection
How drugs interact with
the nervous system.
Vocabulary
nerve pathways, synapse,
synaptic cleft, synaptic
transmission,
neurotransmitters, resting
potential, action potential,
reflex arc, receptor, sensory
neuron, interneuron, motor
neuron, effector.
Reflex Arcs
9.11
 The simplest of our nerve pathways which
includes on a few neurons is called a reflex
arc.
 Reflex arcs are essential for involuntary
actions called reflexes.
 Reflexes are automatic responses to changes
within or outside the body.
 Examples
 Involuntary: heart rate, breathing, blood pressure,
digestion
 Automatic actions: swallowing, sneezing, coughing and
vomiting
Reflex Arc
Classification of Neurons
Classified two ways:
1. Function (direction the impulse is traveling relative to
the CNS…to or from)
2. Structure (# of processes extending from cell body)
FUNCTIONAL CLASSIFICATION
 Sensory (afferent) neurons
 Carry impulses from the sensory receptors
 Motor (efferent) neurons
 Carry impulses from the central nervous
system
Functional Classification of
Neurons
 Interneurons (association neurons)
 Found in neural pathways in the central
nervous system
 Connect sensory and motor neurons
Animations
http://highered.mcgrawhill.com/sites/0072495855/student_view0/
chapter14/animation__the_nerve_impulse.
html
http://wps.pearsoned.co.uk/ema_uk_he_wic
kens_biopsych_3/114/29278/7495416.cw/
content/index.html
Neurotransmitters
Excitatory - increase membrane permeability,
increases chance for threshold to be achieved
Inhibitory - decrease membrane permeability,
decrease chance for threshold to be achieved
Types of Neurotransmitters
• Acetylcholine - stimulates muscle contraction
• Monoamines - Norepinephrine & Dopamine
(sense of feeling good. Low levels = depression)
• Serotonin (sleepiness)
• Endorphins (reduce pain, inhibit receptors)