The Nervous System, Part 2 - Action! Potential!: Crash Course A&P

The video explains how neurons communicate through action potentials, which are electrical impulses that travel along neurons. It covers the basics of electricity in the body, the resting membrane potential, and how action potentials are generated and propagated. The video also discusses the frequency and speed of action potentials, influenced by factors like the myelin sheath. Finally, it introduces future topics and the Crash Course Kids channel.

How do neurons communicate information?

• By varying the strength of impulses

• By changing the frequency of impulses

• By using different types of impulses

• By altering the length of impulses

What is the role of cell membranes in the body's electrical system?

• To store electrical energy

• To separate charges and build potential

• To conduct electricity

• To generate electricity

What is the resting membrane potential of a neuron?

• +70 millivolts

• -55 millivolts

• 0 millivolts

• -70 millivolts

What triggers the opening of voltage-gated sodium channels?

• A specific neurotransmitter

• A change in temperature

• A mechanical stretch

• A change in membrane potential

What happens during the refractory period of a neuron?

• The neuron can respond to weak stimuli

• The neuron can only respond to strong stimuli

• The neuron cannot respond to any stimulus

• The neuron can respond to any stimulus

How does the frequency of action potentials change with stimulus intensity?

• It remains constant regardless of stimulus

• It decreases with stronger stimuli

• It increases with stronger stimuli

• It decreases with weaker stimuli

What is the effect of a myelin sheath on axon conduction?

• It has no effect on conduction

• It stops conduction

• It slows down conduction

• It speeds up conduction

What is saltatory conduction?

• Conduction that occurs in unmyelinated axons

• Conduction that jumps from one node to another

• Conduction that is slower than normal

• Conduction that occurs only in the brain

What is the main factor affecting a neuron's transmission speed?

• The type of neurotransmitter

• The size of the neuron

• The presence of a myelin sheath

• The length of the axon

What happens when an action potential reaches the end of an axon?

• It triggers the release of neurotransmitters

• It strengthens and continues

• It stops and dissipates

• It reverses direction