Chapter 3 Quiz Flashcards
Fill in the Blank: A cell membrane will allow some substances through while blocking others. This is termed ________ ______________ (2 words).
selective permeability
Fill in the Blank: A neuron can be pushed to threshold if many excitatory post-synaptic potentials (EPSPs) arrive at the axon hillock in quick succession or a over short amount of time. This timely process is referred to as “____________ summation”.
temporal
Fill in the Blank: A brain that has periodic “electrical storms” involving major changes in the electrophysiological state of sets of neurons has a disorder called ___________________.
epilepsy
True/False: In general, the action potential is initiated at the dendrites.
False
(If the electrical message has to pass down the axon, it must start at the…)
When thinking of a “lock-and-key” analogy in relation to neurotransmitters we are talking about the:
action of transmitter molecules (ligands) on receptor sites.
The sodium potassium pump operates by pumping IN _______ for every ___________ it pumps OUT of the cell.
2 potassium ions; 3 sodium ions
When the electrical charge of a neuronal membrane becomes more negative, moving away from the possibility of an action potential, it is said to be:
hyperpolarized
In the PowerPoint presentation video, the homunculus represents the amount of “cortical _______ _______” needed by each part of the body. The more sensitive a body area is, the more area is dedicated to processing its information in the cortex.
real estate
The standard model of transmission between neurons is one where the transmitting end of one neuron is synapsed onto the receiving end of another. This arrangement is known as:
Axo-dendritic
Curare is a poison that works by blocking:
acetylcholine (ACh) receptors
True/False: Ion channels are tube-like pores embedded in the membrane of a neuron and allow molecules to pass through.
True
In saltatory conduction, the action potential moves along the axon by jumping from:
one node of Ranvier to the next
Which choice below best fits this description: A hyperpolarizing potential in a neuron that decreases the probability that the postsynaptic neuron will fire an action potential.
inhibitory post synaptic potential (IPSP)
Antagonist- a ______________ that blocks or reduces the actions of a transmitter or other signal molecule
substance
____________ is a substance that binds to receptor molecules (on a postsynaptic membrane)
Ligand
___________ is a fatty insulation around an axon, formed by glial cells
Myelin
All-or-_____ property is the condition that the size (amplitude) of the action potential is independent of the size of the stimulus (the neuron either fires or it does not)
none
Action Potential is the rapid reversal of the membrane (electrical) __________
potential
Electrostatic ____________ is the propensity of charged molecules or ions to move to areas with the opposite charge
pressure
