How nerves work
暂无描述。系统推荐的高质量记忆内容，适合每天坚持背诵学习。
卡片预览 (24 张)
Sensory information travels IN via
dorsal root
motor information travels OUT via
ventral root
afferent
sensory dorsal
efferent
motor ventral
dendrites
receive information
axon hillock
triggers action potential
Axon
sends action potential
Axon terminals
release transmitter
90% cells in the CNS are
glia
Astrocytes
maintain the external environment for the neurones surround blood vessels and produce the blood brain barrier
Oligodendrocytes
form myelin sheaths in the CNS
Microglia
phagocytic hoovers mopping up infection
Graded potentials
decided when an action potential should be fired
Resting membrane potential
keeps cells ready to respond
the inside of a cell is ……….. relative to the outside
negative
RMP of most cells is
-70 mV
equilibrium potential
the membrane potential at which the electrical gradient is exactly equal and opposite to the concentration gradient
the concentration gradient determines the
equilibrium potential
Nernst equation predicts the
equilibrium potential
The RMP is dominated by the resting permeability of
potassium (K+)
interior of cell positively charged
depolarisation
interior of cell negatively charged
hyperpolarisation
the connection where one neuron modulates the activity of a target is called a
synapse
contraction is triggered by AP in the
sarcolemma