Table of Contents
What happens after a neuron receives a stimulus?
After the stimulus goes above the threshold level, more gated ion channels open and allow more Na+ inside the cell. This causes complete depolarization of the neuron and an action potential is created. In this state, the neuron continues to open Na+ channels all along the membrane.
What is it called when a neuron is stimulated?
3. When it is stimulated, the polarity of the nerve cell changes and the process is called depolarization.
What occurs when a neuron is stimulated to its threshold?
When a neuron is sufficiently stimulated to reach the neural threshold (a level of stimulation below which the cell does not fire), depolarization, or a change in cell potential, occurs. Potentials. The term potential refers to a difference in electrical charges.
Which describes the ion concentration inside and outside of a neuron?
The inside of the cell has a low concentration of sodium ions, and the outside of the cell has a higher concentration of sodium ions. There are extra positive charges on the inside of the cell in the form of Na+ ions, and these Na+ ions line up along the membrane.
Does reuptake increase neurotransmitters?
The main objective of a reuptake inhibitor is to substantially decrease the rate by which neurotransmitters are reabsorbed into the presynaptic neuron, increasing the concentration of neurotransmitter in the synapse. This increases neurotransmitter binding to pre- and postsynaptic neurotransmitter receptors.
What is the primary site on a neuron for receiving signals from other neurons?
Dendrites. Dendrites are tree-like extensions at the beginning of a neuron that help increase the surface area of the cell body. These tiny protrusions receive information from other neurons and transmit electrical stimulation to the soma. Dendrites are also covered with synapses.
Is a synapse?
Synapse, also called neuronal junction, the site of transmission of electric nerve impulses between two nerve cells (neurons) or between a neuron and a gland or muscle cell (effector). A synaptic connection between a neuron and a muscle cell is called a neuromuscular junction.
What happens at the synapse between two neurons?
At a synapse, one neuron sends a message to a target neuron—another cell. At a chemical synapse, an action potential triggers the presynaptic neuron to release neurotransmitters. These molecules bind to receptors on the postsynaptic cell and make it more or less likely to fire an action potential.
How does a neuron get activated?
A neuron is activated by other neurons to which it is connected. In turn, its own activation stimulates other connected neurons to activation. If an impulse is started at any one place on the axon, it propagates in both directions. Axons come in two kinds: myelinated and unmyelinated.
What hormone is most closely linked with aggressive behavior?
Hormones Influence Aggression: Testosterone and Serotonin. Hormones are also important in creating aggression. Most important in this regard is the male sex hormone testosterone, which is associated with increased aggression in both animals and in humans.
Do nodes of Ranvier lie between neurons?
Nodes of Ranvier lie between neurons. The space between neurons is called the neuronal space. In convergence, two or more incoming fibers contact a single neuron, whereas in divergence, impulses leaving a neuron pass into several output fibers.
Which of the following is unique to neurons?
Neurons contain organelles common to all cells, such as a nucleus and mitochondria. They are unique because they contain dendrites, which can receive signals from other neurons, and axons that can send these signals to other cells. Myelin provides insulation for signals traveling along axons.