The nervous system consists of two kinds of cells: ____ and ____.
neurons and glia
____ receive information and transmit it to other cells.
Neurons have much in common with the rest of the body's sells. The surface of the cell is its ____ (or plasma membrane), a structure that separates the inside of the cell from the outside environment.
The membrane is composed of two layers of ___ ____ that are free to flow around one another.
Except for mammalian red blood cells, all animal cells have a ____, the structure that contains the chromosomes.
A ____ is the structure that performs metabolic activities, providing the energy that the cell requires for all other activities.
Mitochondria require ____ and ____ to function.
fuel and oxygen
____ are the sites at which the cell synthesises new protein molecules.
Proteins provide ____ ____ for the cell and facilitate various chemical reactions.
Some ribosomes float freely within the cell. Others are attached to the ____ ____, a network of thin tubes that transport newly synthesised proteins to other locations.
Unlike most other body cells, neurons have long branching extensions. The larger neurons have these components: ____, a ____ (cell body), an ____, and ____ terminals.
dendrites, a soma (cell body), an axon, and presynaptic terminals
A motor neuron has its soma in the ____ ____. It receives excitation from other neurons through its dendrites and conducts impulses almond its axon to a muscle.
A ____ neuron is specialised at one end to be highly sensitive to a particular type of stimulation, such as light, sound, or touch.
____ are branching fibres off the soma that get narrower near their ends.
The dendrites surface is lined with specialised synaptic ____, at which the dendrite receives information from other neurons.
Dendritic ____ are short outgrowths that increase the surface area available for synapses.
The cell body, or ____, contains the nucleus, ribosomes, and mitochondria. Most of the metabolic work of the neuron occurs here.
The ____ is a thin fibre of constant diameter. The ____ is the neuron's information sender, conveying an impulse toward other neurons or an organ or muscle.
Many vertebrate axons are covered with an insulating material called a ____ ____ with interruptions known as ____ of ____.
myelin sheath : nodes of Ranvier
An axon has many branches, each of which swells at its tip, forming a ____ ____, also know as and end bulb or bouton.
The presynaptic terminal is the point from which the axon releases ____ that cross through the junction between one neuron and the next.