Lecture notes
Lecture notes Unit 14 - Control and co-ordination
- Institution
- CIE
Summary notes for the unit control and coordination cie a level biology
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ductlessglands
Endocrine
glands organ
that secretes hormones
◦ >
an
directly into the blood
Endocrine
system consists
ofall the
glands and
◦
→
the hormones
they secrete
NERVOUS SYSTEM ENDOCRINE SYSTEM
transmission Electric impulses chemical
messengers
travel in neurons blood
duration short-term
long lasting
receptor
location
cell-surface
membrane
cell
on
surface membrane
within cello
NEURONS
#
r r
sensory Relay Motor
sensory Transmits impulses from receptors to
◦ →
CNS
connector transmits impulses from sensory
Relay
◦ >
to motor neurons
◦ Motor Neurone > transmits impulses from CNS to
effector
, Myelin insulating material that surrounds the
◦
→
axon .
Made
of of cell layers
membranes
Schwann cells here are impermeable to water and
surface formed ions
by
in the tissue
fluid
short
Node
of Ranvier A between Schwann cells
◦ →
gap
0here
myelinated and axons are not
covered
myelin
in are
exposed to the tissue
fluid
( next )
page
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