Nerves & Hormones. Nervous System:. Central Nervous System: (The center of integration and control) 1. The brain 2. The spinal cord Peripheral Nervous System: The nervous system outside of the brain and spinal cord. Basic Nerve cell Structure: Neurons. Dendrites Cell body
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of the Na+ channels are open, but the K+ channels
remain closed. Na+ ions rush into the cell, and
the interior of the cell becomes more positive.
Na+ close and potassium channels
open. K+ ions leave the cell and
the loss of positive charge causes
the inside of the cell to become
more negative than the outside.
A stimulus opens some Na+ channels.
If the Na+ influx achieves threshold potential,
then additional Na+ gates open, triggering an action potential.
Na+ channels are closed,
but the slower K+ remain open. Within a
millisecond, the resting state is restored.
Both Na+ & K+ channels are closed, and the
membrane’s resting potential is maintained.
Thermoregulation is an example of homeostatic mechanism.
The body must balance its heat budget
Heat is gained:
Heat is lost: