Flashcards in Equilibrium and Resting Potentials Deck (61)
receive the synaptic inputs from many other neurons and comprise the major receiving portion of a neuron (they basically act like the neuron’s ears)
conducts action potentials and thus conveys information over long distances that is onto its target neurons
have specialized terminals with which they make synaptic contacts with other neurons or muscle cells
Protein synthesis occurs in the
cell body of neurons
industrial region of each neuron.
refers the electrical difference between two compartments (the inside and the outside of the cell in this case) that is needed to exactly counterbalance the concentration force driving an ion from a compartment where there is a higher concentration of the ion into the compartment having a lower concentration of that ion.
The equilibrium potential
why is nervous system important
Multicellular cells are highly interdependent. The cells have become so specialized in their functions that no cell or tissue is capable of an independent existence. Hence a rapid mode of communication is important
Evolution has provided two solutions to the problem of intercellular communication:
this system of communication is
accomplished by means of a chemical agent, or hormone
characteristic of intercellular communication via hormones is its
slowness because it is limited by the rate of blood flow
Principle Rationale for a Nervous
Rapid Communication Over Long Distances
system designed for rapid intercellular communication over long distances with high
cells that comprise the nervous system are called
In the nervous system, communication occurs by means of pulses of electrical signals called
Neurons have long cellular processes, called
Neurons have long cellular processes, called axons over which
action potentials can be conducted at speeds of up to
4 major parts of neurons
cell body also known as
soma, or cell
body, contains the
nucleus, nucleolus, endoplasmic reticulum, Golgi apparatus and all the
organelles and features that characterize all cells.
where the majority of protein
synthesis occurs, and thus is the neuron’s industrial center.
are a series of processes
that extend from the cell body, and are the parts of the neuron that receives information from
other neurons, as
is a process that extends out from the cell body and
is the part of the neuron that conducts information from the cell body to distant sites.
basically like a wire in an electrical circuit.
Each neuron has how many axon/s
end of the axon
close arrangement of the axon’s terminal and the dendrite or cell body of another cell
occurs at a special site called the
The axon terminal at the synapse has numerous specializations, and the most
obvious are the
numerous synaptic vesicles
The “balloons” are actually membranous vesicles that contain a chemical called a
The major idea
is that when a signal is received at one of the dendrites, the signal triggers an electrical pulse which is an