Nervous system
motor neuron
send the response from central nervous system to efektor
Refractory period
Time that is needed for send the impuls in the unmyelinated axon
Impuls cannot jump from one neurones to another
-They use transmitter substances (neurotransmitter)
Three major classes of molecules function as hormones in vertebrates
Polypeptide, amino, steroid hormones
reinforces a stimulus to produce an even greater response
Positive feedback
Sensory neuron
Send the stimulus from receptor
Saltatory conduction
Local circuits jump from one node to the next
Acetylcholine
Type of neurotransmitter
Location of receptor in steroid hormones
nucleus
Decreasing the sugar level in blood
insulin
Repolarization
K voltage gated channel open
K moves from inside to outside
make the condition inside the cell is repolarize again
Synapse
The parts of the two neurones near to the cleft, plus cleft itself make up a synapse
The type of voltage gated channel that is used in synaptic process
Ca
The example of peptide hormones
ADH, calcitonin
increasing sugar level in blood
glucagon
depolarization
reach the threshold -55mv
Na moves from outside to inside through Na voltage gated channel
make the different gradient between inside and outside,
pre synaptic neurones
The first neurone that get the impuls
coordinate slower but longer-acting responses including reproduction, development, energy metabolism, growth, and behavior
endocrine
The example of steroid hormones
testosterone, estrogen
The central control of hormones
Hypothalamus
Threshold
-55mv
unresponsive axon
because K inside the cell is higher than outside
Post synaptic neurone
Post synaptic neurones responds to all the impulses
conveys high-speed electrical signals along specialized cells called neurons; these signals regulate other cells
Nervous system
inhibits a response by reducing the initial stimulus, thus preventing excessive pathway activity
Negative feedback
What is endocrine
Secretes thing but no special way, secreting in blood