Neuron Communication and Graded Potentials

What is unique about the connection between cells in the nervous system?

Cells are connected to each other in a straight line.

Cells are not connected to each other.

One cell is connected to only one other cell.

One cell is connected to thousands of other cells. (correct)

What type of potential can occur during depolarization or hyperpolarization?

Action Potential

Membrane Potential

Electrical Potential

Graded Potential (correct)

What happens when two graded potentials are added together?

They are added together (correct)

They are multiplied together

They cancel each other out

They remain the same

What determines the strength of a depolarizing graded potential?

Size of the stimulus Signup and view all the answers

What happens when a stimulus causes a depolarization above the threshold?

An action potential is triggered Signup and view all the answers

What is true about the duration of a stimulus and the resulting depolarization?

A longer stimulus duration causes a longer lasting depolarization Signup and view all the answers

What is the primary function of dendrites in a neuron?

To receive signals from other neurons Signup and view all the answers

What is the role of the axon hillock in a neuron?

To generate action potentials Signup and view all the answers

What is the primary function of the axon terminals in a neuron?

To transmit messages to other cells Signup and view all the answers

What is the purpose of the myelin sheath on an axon?

To insulate and facilitate signal conduction Signup and view all the answers

What is the function of the cell body in a neuron?

To house the nucleus and other organelles Signup and view all the answers

What is the term for the signals sent from the axon terminals to other cells?

Neurotransmitters Signup and view all the answers

What is the term for the process where stimuli are spaced out and generate an action potential?

Spatial Summation Signup and view all the answers

What is the result of an excitatory presynaptic input?

Depolarization Signup and view all the answers

What is the threshold potential for the opening of Na+ channels?

-55 mV Signup and view all the answers

What is the result of an inhibitory presynaptic input?

Hyperpolarization Signup and view all the answers

What is the term for the electrical impulses transmitted along nerve fibers?

Action Potential Signup and view all the answers

What happens to K+ permeability during depolarization?

It decreases Signup and view all the answers