spoiler alert

each part of each class 

why second collapse 

why doing cpr immediately 

why the collision cause cardiac arrest 

why has the heart stop 

very very unusually

Free think why this one happen

Ganglia

 peripheral nervous system

The Anatomy of the Ganglia. "Ganglia" is the plural of the word "ganglion."

 Ganglia are clusters of nerve cell bodies found throughout the body. 

They are part of the peripheral nervous system (PNS) and carry nerve signals to and from the central nervous system (CNS).

enteric system

 to consider the enteric system to be a part of the autonomic system because the neural structures that make up the enteric system are a component of the autonomic output that regulates digestion.

Ganglia

 Ganglia are 20,000 to 30,000 afferent and efferent nerve cell bodies that run along on either side of the spinal cord. 

Central nervous system

 The nervous system includes the brain, and the spinal cord.

Central nervous system 

• Brain 
• spinal cord

Peripheral nervous system

• as ganglia and
•  nerves.

A glial cell is one of a variety of cells that provide a framework of tissue that supports the neurons and their activities.

Neurons are cells and therefore have a soma, or cell body, but they also have extensions of the cell; each extension is generally referred to as a process.

Myelin is a fatty substance that surrounds and insulates axons (or nerve fibers) much as insulation does an electrical wire.