detects and interprests information from the surrounding enviroment. It essentially controls most body funtions.
controls body functions through the use of chemical messangers called hormones.
brings needed materials to the cells and carries away waste materials
recaptures and filters fluid fromthe tissues and returns it to the blood stream.
takes oxygen into the body and releases CO₂
takes food into the body, breaks it down, and absorbs the nutrients from the food
removes wastes from the body
supports the body, protects it, and allows movement
makes it possible for the body to move
protects the body and helps regulate body temp.
produces cells necessary to produce offspring.
nerve cells, carry electric pulses between body parts
Cell body (soma); axon;dendrites;nucleus
4 parts of a neuron
anything that sticks off something else in a body
At the dendrites
this is where a neuron recieves impulses
at the axon
this is where a neuron transmits impulses
an electrical signal
when a neuron is resting. Negatively charged when compared to the outside of the neuron.
resting membrane potential (RMP)
wherein the inside of the cell is more negative than the outside. Normally around -70 mV (inside of cell is 70 mV more negative than the outside.)
Na+/K+ ATPase and the K+ leak channel
two membrane protiens that help set up and maintain the RMP
uses a molecule of ATP to move 3 sodium out of the cell and (simultaneously) two potassium ions into the cell.
potassium channels that allow potassium out