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Module 1.3a

Sending
neuron Figure 1.3-6
Agonists and antagonists
Vesicles Curare poisoning paralyzes
containing Action
neurotrans- potential its victims by blocking ACh
mitters receptors involved in muscle
movements. Morphine mimics
endorphin actions. Which is
an agonist, and which is an
Synaptic
gap antagonist? (Information from
Higgins & George, 2007.)
Neurotransmitter
molecule
Receiving neuron
Receptor
sites
Neurotransmitters carry a message
from a sending neuron across a synapse
to receptor sites on a receiving neuron.
Agonist mimics PRACTICE
Receptor site on neurotransmitter, Antagonist blocks
receiving neuron Neurotransmitter opening receptor site. neurotransmitter
Distributed by Bedford, Freeman & Worth Publishers. Not for redistribution.
opens the from opening Argumentation (SP 4)
receptor site. receptor site.
Drug (Out of class) To increase students’
understanding of how drugs alter
neurotransmission, ask them to
Copyright © Bedford, Freeman & Worth Publishers.
research and find scientifically
Open Open
derived evidence of how common
prescription and recreational drugs
are related to neurotransmitters.
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AP Science Practice Check Your Understanding
Use their findings as a basis
Examine the Concept Apply the Concept for discussion about how
▶ Serotonin, dopamine, and endorphins are all chemical ▶ Can you recall a time, perhaps after a workout, when you neurotransmitters can help people
messengers called ____________ . felt the effects of endorphins? How would you explain those
feelings? with neurological disorders and
▶ Curare poisoning paralyzes animals by blocking ACh harm those who abuse drugs.
receptors involved in muscle movements. Morphine mimics the
actions of endorphins. Which is an agonist, and which is an
antagonist?

Answers to the Examine the Concept questions can be found in Appendix C at the end of the book.
TEACH 1.3-4
Dig Deeper
The Endocrine System
The text describes how the endocrine
1.3-4 How does the endocrine system transmit information and interact with the endocrine [EN-duh-krin] system and hormones influence

1.3-4 How does the endocrine system transmit information and interact with the
nervous system?
nervous system? system the body’s “slow”
chemical communication system; behavior and mental processes.
a set of glands and fat tissue
So far, we have focused on the body’s speedy electrochemical information system. Inter- that secrete hormones into the This material is important for the
connected with your nervous system is a second communication system, the endocrine bloodstream. AP exam. However, information
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system The endocrine system’s glands and fat tissue secrete another form of chemical
.
about the specific glands that secrete
hormones (with the exception of the
The Neuron and Neural Firing: Neural Communication and the Endocrine System Module 1.3a 35
pituitary gland) is outside the scope of
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the AP exam.
03_myersAPpsychology4e_28116_ch01_002_163.indd 35 15/12/23 9:21 AM

The Neuron and Neural Firing: Neural Communication and the Endocrine System Module 1.3a 35

03_HammerTE4e_47547_ch01_2a_163_4pp.indd 35 07/02/24 5:19 PM