Biology Questions and Answers
reticulum that releases calcium ions into
the sarcomertriggering contraction.es of the myofibrils thus
- How does the nervous
system get information about
the external environment, the
organs and the tissues?
Information aexternal and internal bout the conditions oenvironments, likef the (^)
temperature, pressure, touch, spatial
position, pHcarbon dioxide, etc.), lig, metabolite levht, souels (oxygen,nds, etc., (^)
are collected by specific neural
structures (information) each for each typcalled sensory receptors.e of (^)
Sensory receptors are distributed
throughout the tissuestheir specific roles. The receptors get according to (^)
that information and transmit them
through their own axons or throughdendrites of neurons that connect to (^)
them. The information reaches the
central nervous system that interand uses it to control and regulate tpretshe (^)
body.
- What are sensory
receptors?
Sensory rspecialized ieceptors arn the acquirie structuresng of
information, like temperature,
mechanicalenvironment and luminosity, pressure, pH, chemical
transmitting them to the central
nervous system.be specialized cells, e.g., the Sensory receptors may
photoreceptors of the retina, or
specialized iexample the vibration rnterstitial structures, foeceptors of ther (^)
skin. In this last case they transmit
information neurons connected to tto dendrites of sensoryhem. There are (^)
also sensory receptors that are
specialized tdendrites (e.g., the olfactoryerminations of neuronal receptors).
- According to the stimuli
they collect how are the
sensory receptors classified?
The sensory according to the stimulireceptors are classified they get:
mechanorpressure (e.g., touch or eceptors are stimulated sound); by
chemoreceptors respond to chemical
stimuliconcentration, etc.); (olfactory, taste, pHthermoreceptors, metabolite
are sensitive to temperature changes;
photoreceptors are stimulated nocireceptors send pain information;by light;
proprioceptors are sensitive to the
spatial position (they generate informatioof musclesn for the and joints
equilibrium of the body).
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