PSYC100 WS-05
A nerve cell's threshold is typically ___ microvolts (mV).
-55
A nerve cell's resting potential is typically ___ microvolts (mV).
-70
Select the TWO statements that are accurate.
-An action potential begins when Na enters the cell. -An action potential always occurs when a neuron's charge is depolarized to the point where it reaches its threshold, and that electrochemical signal is of the same exact intensity every time.
At rest, there are
-More Na outside the neuron -More K ions inside the neuron
The consequence of Mr. Gage's 'issue' was reportedly
A loss of executive control
Mr. Gage suffered with an 'issue' related to
A spike through the frontal lobe
When a neuron sends information down the axon, is called an ___ ___ (two words) also known as a spike or impulse.
Action potential
Select the appropriate sequence
Excitation > threshold > action potential > absolute refractory period > relative refractory period
The most common research methodologies to test genetic/biological vs. environmental impacts on behavior are
Family studies, twin studies, and adoption studies
A nerve cell's threshold is its
Level of excitement required to trigger an action potential
Which of the following brain imaging techniques is used at the Maryland Neuroimaging Center?
MRI
Variables such as ________ are considered shared, while variables such as _______ are considered unique.
Socioeconomic status & parent education; peer-group
When a pre-synaptic nerve's action potential results in the release of chemicals that reach the dendrites of a post-synaptic cell (the next one in the chain):
The post-synaptic cell may be more or less likely to fire depending on the whether the pre-synaptic cell has an excitatory or inhibitory effect
Nerve cells in our skin can tell the brain whether stimulation is good (e.g., a friendly touch) or dangerous (e.g., a hot stove) because
There are different kinds of neurons and each only detects one kind of stimulation.
How do researchers demonstrate that behavior has a genetic component?
They found that identical (MZ) twins are more alike (more similar to each other) compared to fraternal (DZ) twins who also grew up together.
What is reuptake?
When a pre-synaptic neuron absorbs a signaling chemical after it has sent a message so that it can be reused.
A reflex arc, sensory information processed through the spinal cord, requires the brain to regulate the body's response, true or false?
false
A single neuron can release only one type of neurotransmitter, true or false?
false
Neurochemicals released from the terminal buttons of one nerve cell cross the cell membrane and then travel through the ___ before reaching the dendrites of another cell.
synapse
