Biology Questions and Answers

Biology Questions and Answers

transmits the neural impulse at distance
to other neurons, to muscle cother effector cells. ells and to

6. What is the name of the
   terminal portion of the axon?

The terminal pcalled presynapticortion membrane. Throughof the axon is (^)
this membrane neurotransmittersreleased into the synaptic junction. are

7. What are synapses?

Synapses are the structures that
transmittwo neurons. the neural impulse between

When the electric impulse arrivpresynaptic membrane of the axones the
releases neurotransmitters that bind to
postsynapticof the next cell. T receptors ohe activatedf the dendrites state of
these receptors alters the permeability

of the dendritic membrane and theelectric depolarization propagates alo (^) ng
the neuron plasma membrane to its
axon.

8. What is an example of a
   situation in which the neuron
   cell body is located in a part of
   the body and its axonal
   terminal portion is in another
   distant part of the body? Why
   does this happen?

Most of the neurons arthe brain and the spinal cord (centrale situated within

nervous system) in places known as

neural nuclei. Neural ganglia, are structures oganglia, or simplyf the peripheral (^)
nervous system located beside the
spinal column where neuron cell bodies aror near some oe alsorgans
located.
Neurons situated at sppresent distant axonal tecific points canerminations an (^) d
they also can raxons of distanteceive neurons. The inferiorimpulses from (^)
motor neurons situated in the spinal
cord are examtransmit information to thples since their axoe extremitiesns can
of the inferior limbs triggcontractions of the foot. ering

9. According to the function of
   the transmitted neural
   impulse which are the types of
   neurons? How different are
   the concepts of afference and
   efference of the neural
   impulse transmission?

There are three types oafferent neurons, efferent neurons anf neurons: (^) d
interneurons. Afferent neurons arethose that only transmit sensory
information from the tissues to neural
nuclei and ganglia (where they makconnection with interneurons or effectore (^)
neurons). Efferent neurons are those
that transmitperformed in seve commanral parts of the body.ds to tasks (^)
Interneurons, also known as association
neurons or relay connection between two otneurons, serve asher neurons.
Afference is the conduction of impulses and efference is the sensory
conduction of effector impulses
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