Nervous System 2

What is the communication junction called?

Synapse

What are three types of synapses?

• Neuron - Neuron

• Neuron - Muscle

If an action potential happens between two neurons, whats going to happen?

The action potential travels to the next cell

If an action potential happens between a neuron and muscle, whats going to happen?

A contraction

If an action potential happens between a neuron and gland, whats going to happen?

Hormone Release

The synapse involves what parts of the neuron? (in the case its a neuron - neuron)

• Axon Terminals from neuron 1

• Tip of dendrites from neuron 2

What is inside the axon terminals?

Vesicles

What are vesicles?

Little sacs that hold special little packages

• in the case of the nervous system, its neurotransmitters

What do neurotransmitters do?

They send messages

An impulse is called a?

Action potential

When an action potential goes down the axon and reaches the axon terminals, what are the events that occur?

• Little channels open on the terminal, which allow Calcium ions to flood inside the terminal

• The calcium then signals the little vesicles to move towards the dendrites and release the neurotransmitters in them

• The neurotransmitters cross the synapse and bind to receptors on the dendrites

What are the two cells that make up the nervous system?

• Neurons

• Neuroglia cells

The CNS and PNS have different types of?

Glial Cells

What are the glial cells in the CNS?

• Astrocytes

• Microglia

• Oligodendrocytes

• Ependymal

Which glial cell in the CNS is being described?

• Metabolic and Structural support

Astrocytes

Which glial cell in the CNS is being described?

• Removes debris

Microglia

Which glial cell in the CNS is being described?

• Makes Myelin

Oligodendrocytes

Which glial cell in the CNS is being described?

• Covers and lines cavities

Ependymal

What are the two types of Neuroglia cells in the PNS?

• Satellite Cells

• Schwann cellls

Which glial cell in the PNS is being described?

• Support Cells

Satellite Cells

Which glial cell in the PNS is being described?

• Make Myelin

Schwann Cells

What is the reflex arc?

The moment that you have a sensation on your body:

• How does it transport an impulse to your CNS?

• How does your CNS respond to your body with the appropriate message?

What are the parts of the reflex arc?

• Receptor

• Sensory/Afferent Neuron

• Interneuron

• Motor/Efferent Neuron

• Effector

• CNS

What part of the reflex arc is being described?

• End of dendrite

• Where stimuli is detected

Receptor

What part of the reflex arc is being described?

• Interprets message and makes an appropriate response

CNS

What part of the reflex arc is being described?

• Sends message towards CNS

Sensory/Afferent Neuron

What part of the reflex arc is being described?

• Carrying the message from the CNS of what the effector is supposed to do

Motor/Effector Neuron

What part of the reflex arc is being described?

• Bridge between sensory and motor neuron

Interneuron

What part of the reflex arc is being described?

• Receives message from motor/efferent neuron and performs the message from CNS

Effector

What are the steps of the reflex arc?

• Some sort of stimulus is detected by the dendrite (receptor)

• Stimulus goes up the sensory/afferent neuron and into the CNS

• It goes to the Interneuron and comes out through the motor/efferent neuron

• The motor/efferent neuron bring it to the effector and tells it what to do

An afferent neuron is also a?

Sensory Neuron

An efferent neuron is also a?

Motor Neuron