Psychology (2026/2027 Latest Update) |
Verified Questions & Correct Answers |
Grade A | Portage Learning
Academic Year
Q: Which part of the nervous system allows us to interact with the world? What are the two
subdivisions that allow us to sense things and act on the world?
Answer
Central Nervous System allows us to interact with the world. Two subdivisions that allow us
to sense things and act on the world include the sympathetic and the parasympathetic cord.
Q: Identify the primary structural parts of a neuron and the functions they serve as
described in the textbook and during lecture.
Answer
Information is received at the dendrites, is passed through the soma and along the axon,
and is transmitted to the dendrites of other cells at mean points called synapses, where
neurotransmitters are released from the terminal buttons. Glial cells provide various types
of support for neurons (like nourishment, insulation, waste removal) and may contribute to
signal transmission in the nervous system.
, Q: Explain how charged particles (e.g., Na+ ions) are differentially distributed inside and
outside of the resting neuron.
Answer
Negative Resting Potential: When resting there is a relatively lower concentration of
positive ions inside the cell.
Q: What is a neurotransmitter? Generally speaking, how do neurotransmitters influence
the internal potential of a post-synaptic neuron? Use the lock-and-key analogy in your
description.
Answer
Neurotransmitter: a chemical released by neurons that bind to other neurons.
Neurotransmitter is the key, while the neuron is the lock. Neurotransmitters influence the
internal potential of a post-synaptic neuron by changing how ions flow across the
membrane.
Q: What is an action potential? Explain how it is initiated and results in the release of
neurotransmitters.
Answer
Action potential: a sudden shift in the neurons electrical charge (more positive) that travels
down the axon. The firing of an action potential allows the channels in the cell membrane
that opened to let in sodium close up. Time is needed until it can open again, until then the
neuron cannot fire.