Neurons and Neural Firing

What is the reflex arc?

Answer explanation

Answer should be along the lines of:

Response to stimuli by signals being sent through various neurons (sensory, inter, motor) then to the muscles ← skips the brain

Tags

NGSS.HS-LS1-3

What is the route of neural firing?

• terminal button → terminal branch → axon covered by myelin sheath connected by nodes of ranvier → axon hillock → soma → dendrites

• soma → axon covered by myelin sheath connected by rodes of ranvier → axon hillock → terminal button → terminal branch → dendrites

• dendrites → soma → axon hillock → axon covered by myelin sheath connected by nodes of ranvier → terminal branch → terminal button

• soma → dendrites → axon covered by myelin sheath → axon hillock → nodes of ranvier → terminal branch → terminal button

Why is neural firing referred to as a salty banana?

Answer explanation

Answer should be along the lines of:

There is Na+ ions outside and K+ ions inside a neuron, like a banana with salt on it.

What is the all or nothing principle?

• Neuron cannot refire after refiring, must wait

• Neuron can only have all sodium in it or all potassium in it, cannot have both at the same time

• Neuron will either fire action potential or not fire at all

What is the threshold for action potential to fire?