knowverseHow do neurons communicate? They transmit action potentials along axons to synapses where neurotransmitters cross the synaptic cleft to bind receptors on receiving cells. The quiz covers synapses, myelin sheath function, action potential threshold, the synaptic cleft, reuptake, receptor antagonists, spinal reflexes, the thalamus, and the hippocampus. Try the questions to check your understanding.
Your score is next.
Dendrites are branching receiving areas that commonly receive signals from neighboring cells.
When a neighboring cell sends out a message, the dendrites are the first part of the neuron to catch it.
From the Knowverse course text.
Myelin forms a segmented fatty layer around the axon that speeds up electrical transmission across long distances.
The myelin sheath is a fatty, insulating layer that wraps around the axon in segments.
From the Knowverse course text.
Neurons operate on an all-or-none response. If stimulation stays below threshold, no action potential is generated.
A neuron's reaction is an all-or-none response, meaning it either fires with full strength or it does not fire at all.
From the Knowverse course text.
Because each action potential fires at full strength, the brain judges stimulus intensity by cell count and impulse rate.
Your brain interprets the intensity of the slap based on the number of neurons firing and how frequently they fire, not the strength of each individual pulse.
From the Knowverse course text.
At a chemical synapse, the synaptic gap separates the sending terminal from the receiving cell.
The actual empty space between these two structures is specifically called the synaptic gap.
From the Knowverse course text.
Reuptake is the recycling mechanism where sending neurons reabsorb leftover neurotransmitters from the gap.
To prevent this, the sending neuron begins a cleanup process known as reuptake.
From the Knowverse course text.
A receptor antagonist opposes activation at its receptor. The result depends on which signaling system is involved.
In contrast, an antagonist molecule does the opposite by inhibiting or blocking a neurotransmitter's action.
From the Knowverse course text.
The spinal reflex circuit can trigger a response without first waiting for a conscious decision. Signals can also travel to the brain.
Because this loop only involves the spinal cord, the action happens much faster than a conscious choice.
From the Knowverse course text.
The thalamus receives incoming sensory data and routes it to higher brain regions for processing.
The Thalamus acts as the brain's sensory control center, receiving information from your eyes, ears, and skin.
From the Knowverse course text.
The hippocampus contributes to forming new explicit memories. The effects of damage depend on its extent, and older memories need not all disappear.
Damage to the Hippocampus doesn't necessarily wipe out old memories, but it makes it impossible to form new ones.
From the Knowverse course text.
See the answer and explanation for each question below.
Find more quizzes and full courses in the free iOS app.
Read more about the topic
Neurons receive and transmit information. Dendrites are common receiving sites, while an axon carries action potentials toward its terminals. Myelin insulates many axons and speeds signal transmission. An action potential occurs when stimulation reaches threshold. Below threshold, that neuron does not produce the smaller version of an action potential.
An action potential follows an all-or-none pattern. Stronger stimulation can be represented through how frequently neurons fire and how many are active, rather than simply making each pulse larger. Reflex pathways can produce a rapid response through a spinal circuit before a conscious decision is made. This describes the spinal reflex example used here.
This specific level of stimulation required to trigger a neural impulse is called the threshold.
From the Knowverse course text.
At a chemical synapse, an arriving action potential triggers neurotransmitter release from the sending terminal. The molecules cross a small gap and bind to receptors on the receiving cell. This description concerns chemical communication; it does not mean every connection between neurons works in exactly the same way.
Reuptake clears some neurotransmitters by returning them to the sending neuron. Receptor agonists activate receptors, while receptor antagonists can prevent their activation. Different brain structures have different roles: the thalamus relays much sensory information, and the hippocampus contributes to forming new explicit memories. Damage can impair that process without erasing every older memory.
To prevent this, the sending neuron begins a cleanup process known as reuptake.
From the Knowverse course text.
Sources: Biological Systems and Behavior. Each question or step includes an excerpt from the course.
