Ch. 6: Body and Behaviour Part 1: The Nervous System, Presentation

Record Physical Responses

Sorry .... Record your physical responses to being startled. Report OutAKON Mycin sheath Terminal button- Soma Dendr tes Dendr tes Ch. 6: Body and Behaviour sheath Part 1: The Nervous System Soma Mycf n sheath .Dendr tes Soma Terminal button- Mycí n sheath Axon Terminal button- sheath Mycin AKON cin ath al button- Soma sheath Terminal button- Terminal buttonAxon Mycin sheath Terminal button- Terminal button- Your Nervous System Reacted AKONI Dendr tes Mycl n sheath sheath Mycin

What is the Nervous System?

Soma Mycí n sheath Dendr tes The system responsible for communicating information throughout your body. It controls Mycin your movements, emotions, thinking, and behaviour. Terminal button Terminal button- Soma Soma Mycin

Central Nervous System (CNS)

AKONCentral Nervous System (CNS): - INCLUDES THE BRAIN AND SPINAL CORD - CONDUCTS MESSAGES FROM THE BRAIN OUT TO THE PERIPHERAL NERVOUS SYSTEM. Cerebral cortex Corpus callosum Diencephal Basal ganglia Mesencephal Cerebellum Pons Bulb 00 Cervical roots Spinal cord Dorsal roots I Cauda equina Lombar roots - $1 . Sacral rootsPeripheral Nervous System (PNS):

Peripheral Nervous System (PNS)

cranial nerves peripheral nervous system spinal nerves - SMALL BRANCHES OF NERVES THAT REACH FROM THE CENTRAL NERVOUS SYSTEM TO THE OTHER PARTS OF THE BODY. - TRANSMITS MESSAGES FROM THE BODILY ORGANS TO THE CENTRAL NERVOUS SYSTEM AND BACK TO THE MUSCLES.Peripheral Nervous System (PNS):

PNS Subdivisions

1. Somatic Nervous System - Controls voluntary muscles
2. Autonomic Nervous System - Controls involuntary muscles

Autonomic Nervous System Components

• Sympathetic Nervous System - Provides "Fight or Flight" response.
• Parasympathetic Nervous System - Enables "Recovery and Rest".

Parasympathetic and Sympathetic Nervous System Functions

Parasympathetic Sympathetic Dilates pupil Stimulates flow of saliva Ganglion Inhibits floy of saliva Medulla oblongata Slows heartbeat Accelerates heartbeat Yagus nerve Constricts bronchi Dilates bronchi Solar plexus Stimulates peristalsis and secretion Inhibits peristalsis and secretion Stimulates release of bile Conversion of glycogen to glucose Secretion of adrenaline and noradrenaline Contracts bladder Chain of sympathetic gan glia Inhibits bladder contraction

Startle Response and Nervous System Involvement

Was the sympathetic or parasympathetic nervous system involved when you were startled? How do you know?

Nervous System Overview

Nervous System cranial nerves - peripheral nervous system spinal nerves - Dorsal - -

Nervous System Branches

• Central Nervous System (CNS)
• Peripheral Nervous System (PNS)

PNS Subsystems

• Somatic Nervous System (SNS)
• Autonomic Nervous System (ANS)

Autonomic Nervous System Divisions

• Sympathetic Nervous System
• Parasympathetic Nervous System. Excellent 4 minute discussion of the effects of stress. (found by student last year)

Cells of the Nervous System

Which cells make up the Nervous System?

The Structure of a Neuron

Dendrites The Structure of a Neuron - Three basic parts: · dendrites · cell body · axon Cell Body Axon

What Is a Neuron?

· Question: What Is a Neuron? · Answer: A nerve cell that is the basic building block of the nervous system. Neurons are specialized to transmit information throughout the body. O . Sensory neurons carry information from the sensor receptor cells throughout the body to the brain. . Motor neurons transmit information from the brain to the muscles of the body. · Interneurons are responsible for communicating information between different neurons in the body.

Neurons are Amazing!

Neurons are Amazing! Some neurons have short axons, while others can be quite long. The longest axon in the human body extends from the bottom of the spine to the big toe and averages a length of approximately three feet!

The Neuron Connection

The Neuron Connection There is a space between the dendrites of one neuron and the axon terminals of another. The space is called a synapse. >Dendrites Soma Axon Myelin sheath Soma Axon Myelin sheath Terminal button- Terminal button Synapse (gap) Dendrites

Task: Nervous System Exploration

Task · 1. Read pg. 154-159 . 2. Vocab pg. 155, 160 (Use vocabulary sheet provided) . 3. Draw and label a picture of at least 2 neurons. Include: -dendrites -cell body -nucleus 4. -axon -myelin sheath -axon terminals -synapse -neurotransmitters. Explain fully how impulses are transmitted along and between neurons. . 5. What is the explanation for a "runner's high?" Would the sympathetic or parasympathetic nervous system be involved ? Explain how you know.