PSYC 1000U Chapter Notes - Chapter 2: Angular Gyrus, Aphasia, Cerebral Cortex

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raspberryhorse819

22 Feb 2013

School

UOIT

Department

Criminology-and-Justice

Course

PSYC 1000U

Professor

Leigh Harkins

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Document Summary

Psychology chapter two (the brain) lecture. Why we behave the way we do. Why we act the way we do. Controls basic metabolic function of each neuron. The axon is how information is passed from the cell body down to other cell neurons. The axons is where information goes a long until it makes it way to the next muscle. Terminal branches form junctions with other cells. The axon is covered in myelin sheath helps the electrical signal move faster. Node of ranvier help the electrical impulse move faster. Each neuron receives a number of messages which can be excitatory or inhibitory. When they reach a certain level or threshold the neuron fires which is known as action potential. Positive ions flow into the axon which changes the overall value of the axon. Changes the resting potential to action potential.

Related Questions

The junction specialized for the transmission between a neuron and another cell is called a (1) _____ ______. Usually, the signal being sent to the receiving cell is carried by chemical messengers called (2) _____. (3) _____ is an example of this type of chemical messenger, which diffuses across the synaptic cleft, combines with protein receptor molecules on the muscle cell membrane, and soon thereafter is rapidly broken down by enzymes. At an (4) ____ synapse, the membrane potential is driven toward the threshold value and increases the likelihood that depolarization and an action potential will occur. At an (5) ____ synapse, the membrane potential is driven away form the threshold value, and the receiving neuron becomes hyperpolarized and is less likely to achieve an action potential. A specific transmitter substance can have either excitatory or inhibitory effects depending on which type of protein channel it opens up in the (6) ____ membrane. (7) ____ are neuromodulators that inhibit perceptions of pain and may have roles in memory and learning, emotional states, temperature regulation, and sexual behavior. (8) ____ ________ at the cellular level is the moment-by-moment tallying of all excitatory and inhibitory signals acting on a neuron. Incoming information is (9) ____ by the cell bodies, and the charge differences across the membranes are either enhanced or inhibited. Some narrow-diameter neurons are wrapped in lipid-rich (10) _______ produced by specialized neuroglial called Schwann cells; each of these is separated from the next by a(n) (11) ________ ________ - a small gap where the axon is exposed to extracellular fluid. A (12) ____ is an involuntary sequence of events elicited by a stimulus. During a (13) _______ ________, a muscle contracts involuntary whenever conditions cause a stretch in length; many of these help you maintain an upright posture despite small shifts in balance. Imbalances can occur at chemical synapses; a neurotoxin produced by Clostridium tetani blocks the release of GABA and glycine, thus freeing the motor neurons from (14) _____ control, which may cause tetanus â a prolonged, spastic paralysis that can lead to death. A. Excitatory H. Stretch reflex B. Inhibitory I. Summed C. Myelin J. Neurotransmitters D. Chemical synapse K. Postsynaptic E. Synaptic integration L. Endorphins F. Exposed node M. Acetylcholine (ACh)

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PSYC 1000U Chapter Notes - Chapter 2: Angular Gyrus, Aphasia, Cerebral Cortex

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