Brain and Neurons A

What happens to neurotransmitters after they have been released? mark all that apply

• Broken down by enyzmes

• Float away

• Reabsorbed

• Used as building blocks for other neurotransmitters

• Stay permanently bonded to their receptors

______ send signals away from neurons whereas ______ receive signals from other neurons.  

• Axons; Dendrites
• Synapses; dendrites
• Dendrites; axons
• Axons; synapses

What do you call a signal that has gone above threshold and causes a signal to be sent?

• threshold potential

• action potential

• resting potential

• homeostasis

Form an epithelial-like membrane that covers specialized brain parts and form the inner linings that enclose spaces in the brain and spinal cord. Also help circulate spinal fluid between the brain and spinal cord

• microglial cells
• astrocytes
• ependymal cells
• oligodendrocytes

What is the insulating membrane that surrounds parts of the axon that helps the impulses travel faster called?

• Axon
• Dendrites
• Node of Ranvier
• Myelin Sheath

For an a signal to go above threshold it must go above _____, thus causing an Action Potential

• -70 mV

• -55 mV

• 35 mV

• 55 mv

At resting potential this ion is in high concentration on the outside of the neuron membrane making the outside of the neuron positively charged.

• negatively charged amino acids
• potassium
• sodium
• calcium

Label the Neuron-What does the letter "E" represent?

• Schwann Cell

• Node of Ranvier

• Axon Terminal

• Axon

Align along axons and provide insulating layers of myelin in the brain and spinal cord. Can myelinate multiple axons.

• microglia 

• astrocytes

• ependymal cells

• oligodendrocytes

Which neurotransmitter is responsible for you mood, appetite, and perceptions? The one that makes you happy

• Glutamate

• Norepinephrine

• Dopamine

• Serotonin

• Acetylcholine