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PSY110 Psychology
Module 6 – The Nervous System and the Endocrine System: Communicating Within the
Body - Pages 63-70
Complexity
 One neuron may connect to 80,000 other neurons
 Total neural connection may exceed one quadrillion
(1,000,000,000,000,000 – 15 zeros)
 Endocrine system communicates with hormones through
the blood system
The Nervous System
 Central Nervous System (CNS) – Brain & Spinal Cord
 Peripheral Nervous System – From spinal cord to
exremities
Spinal Cord
 Conduit
 Reflexes
o Sensory (afferent) neurons
o Motor (efferent) neurons – (muscles)
o Interneuron – connect sensory to motor
Peripheral Nervous
 Somatic (Voluntary) – Senses & Vol Movement
System
 Autonomic (Involuntary) – Unconscious bodily
functions
o Sympathetic – Prep the body for emergency
(fight or flight)
o Parasympathetic – Calm the body
Evolutionary and
Genetics predisposes people to behave in particular ways or
Behavioral Genetics
to have particular characteristics
Endocrine System
 Hormones (chemical messengers) affect function and
growth of parts of the body
 Pituitary (Master Gland) – Regulated by the
hypothalamus – Responsible for growth & homeostasis
 Thyroid (&Parathyroid) – Metabolism
 Thymus – Immune system
 Adrenal Gland & Pancreas – Produce Insulin &
Glucagon – control sugar metabolism
 Ovary & Testis – Produce sex hormones
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Richard Goldman