Download The Nervous System

The Nervous System
The Central Nervous System
 The master design system that controls
everything in your body including; heart
rate, eye movements, higher mental
processes, and reasoning
The most important part of the system is
your brain. There are 3 major parts: the
hindbrain (lower brain), the midbrain, and
the forebrain
The Central Nervous System
 The Spinal Cord
A column of nerves as thick as your
thumb that is an extension of your
brain
Begins at the base of the brain, runs
down your back and ends below your
waist
The Central Nervous System
 The Spinal Cord
The spinal cord is encased in a
protective bony column called the
spine
Transmits information between the
brain and the nervous system and
controls some reflexes.
The Central Nervous System
 The Spinal Cord Cont…
 A reflex is an automatic, unlearned reaction to
a stimulus
 A spinal reflex is reflex controlled by the spine
that bypasses the brain.
 Ex. knee-jerk reflex, pulling your hand off of
a hot stove, or closing your eye when you see
something coming toward it (write down 1).
The Peripheral Nervous System
 Part of the nervous system that connects
your central nervous system with other
parts of your body
 Divided into 2 parts
 The Somatic Nervous System
 The Autonomic Nervous System
The Peripheral Nervous System
 The Somatic Nervous System
 Transmits messages between your central
nervous system and your sensory organs
and muscles
 Regulates subtle movements that maintain
posture and balance
 Composed of sensory and motor neurons
The Peripheral Nervous System
 The Autonomic Nervous System
 Controls internal bodily processes like
heartbeat, respiration, and digestion
 It is divided into the sympathetic nervous
system and the parasympathetic nervous
system
The Peripheral Nervous System
 Sympathetic Nervous System
 Speeds up bodily processes and draws
energy from stored reserves
 Alarm system that heightens arousal and
mobilizes bodily resources in times of
stress or physical exertion
The Peripheral Nervous System
 The Parasympathetic Nervous System
Fosters bodily processes, such as
digestion, that replenish stores of
energy
Also helps conserve energy by
slowing down other bodily processes
Assignment
P.52
Recall It
Think About It