The nervous system that uses electrical signals to specific molecules this only takes a fraction of
a second and effect is short lived. The endocrine system uses specific molecules secreted by
special cells into the bloodstream and transported though the body to target tissues effects are
normally long lasting.
The hypothalamus is the sensing center in the brain for physiological stress.
They cause short term stress response. Glycogen to break down to glucose that increases blood
pressure, breathing rate, metabolic rate which increase alertness and decrease digestive and
Retention of sodium and water by the kidney. Increase blood volume. Proteins and fats broken
down and converted to glucose. Immune system may be suppressed.
The function of the dendrite is that they receive information from other neuron.
The function of the axon is where the action potential is transmitted to another neuron.
A mixture of proteins and phospholipids that created an insulating sheath around the nerve
fibers. They are produced by the Schwann cells.
The area is called Node of Ranvier. They don’t have myelin because it is faster to transmit action
potential. Away from the cell body, towards the terminus.
Positive to Negative.
The resting potential is -70mV. Only nerve and muscle cells can generate changes.
At resting potential the membrane is polarized because it is negative in the inside and positive
on the outside. When the nerve is simulated by touch, electrically or chemically by molecules
that affect membrane protein channels. First the membrane is depolarized because NA channels
open up and NA flows down their gradient into the cell this will cause the cell to change from
negative to positive. After membrane protein for K opens and K starts to move out of the cell
which will cause the cell membrane to go ba