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The Nervous System
Chapter 2
I forgot to
study for my
AP Psych
Quiz!
The Nervous System
Nervous System
Central
Nervous
System
(CNS)
Peripheral
Nervous
System
(PNS)
Kinds of Neurons
Sensory Neurons (a.k.a. Afferent Neurons) carry incoming
information from the sense receptors to the CNS.
Motor Neurons (a.k.a. Efferent Neurons) carry outgoing
information from the CNS to muscles and glands.
Interneurons connect the two neurons (between).
Sensory/Afferent
Neuron
Interneuron
Motor /Efferent
Neuron
Autonomic Nervous System (ANS)
Controls glands & organs
Sympathetic N.S.
“Arouses”
(fight-or-flight)
Parasympathetic N.S.
“Calms”
(rest & digest)
Central Nervous System
The Spinal Cord and Reflexes
(simple, automatic response to sensory stimuli)
Simple Reflex
Central Nervous System
The Brain and Neural Networks
Interconnected neurons form networks in the
brain. Theses networks are complex and modify
with growth and experience (“use it or lose it”).
Complex Neural Network
The Endocrine System
Chapter 2
The Endocrine System
The Endocrine
System is the body’s
“slow” chemical
communication
system.
Communication is
carried out by
hormones
synthesized by a set of
glands.
The Endocrine System
• Some concepts about Hormones
– Travel through the bloodstream
– Some are chemically similar to
neurotransmitters
• Pituitary Gland = “the master gland” gets orders
from the brain (hypothalamus = “the master’s
master”)
– Basic Feedback system:
• Brain (hypothalamus) pituitary 
other endocrine glands  hormones  brain
• Overall, the Endocrine and Nervous Systems
constantly interact with one another