What is the difference between stimulus and nerve impulse?

What is the difference between stimulus and nerve impulse?

(a) Stimulus :Any change in the environment that usually results in change in the activity of the body. Impulse :A wave of electrical disturbance that runs through the nerves.

What is the relationship between neuron and nerve impulse?

A nerve is a bundle of nerve cells. A nerve cell that carries messages is called a neuron. The messages carried by neurons are called nerve impulses. Nerve impulses can travel very quickly because they are electrical impulses.

How does the nervous system respond to a stimulus?

Receptors are groups of specialised cells. They detect a change in the environment (stimulus). In the nervous system this leads to an electrical impulse being made in response to the stimulus. Sense organs contain groups of receptors that respond to specific stimuli.

What is the difference between response and stimulus?

The main difference between stimulus and response is that a stimulus is an event or condition which initiates a response whereas response is the organism’s reaction to a stimulus.

What is nerve impulse and nervous system?

Definition. (1) The movement of action potential along a nerve fiber in response to a stimulus (such as touch, pain, heat or cold). (2) The relaying of a coded signal that travels along a nerve cell membrane to an effector, such as muscle, gland or another nerve cell. Supplement.

What is the relationship between action potentials and nerve impulses quizlet?

A momentary change in electrical potential on the surface of a neuron or muscle cell. Nerve impulses are action potentials. They either stimulate a change in polarity in another neuron or cause a muscle cell to contract.

What does a nerve impulse do?

(1) The movement of action potential along a nerve fiber in response to a stimulus (such as touch, pain, heat or cold). (2) The relaying of a coded signal that travels along a nerve cell membrane to an effector, such as muscle, gland or another nerve cell.

What happens to a nerve once it first responds to a stimulus?

That stimulus starts a nerve impulse along the cell membrane. When a neuron is at rest, the inside of the cell membrane is electrically negative compared with the outside. When the impulse reaches the end of the axon, chemicals are released and picked up by a neighboring neuron, causing the nerve impulse to continue.

What is a stimulus in nervous system?

A stimulus is a change in the environment (either external or internal) that is detected by a receptor. Receptors transform environmental stimuli into electrical nerve impulses. These impulses are then transmitted via neurons to the central nervous system where decision-making occurs.

What is the relationship between stimulus and response?

A change in the environment is the stimulus; the reaction of the organism to it is the response.

What happens between stimulus and response?

In that space is our power to choose our response. In our response lies our growth and our freedom.”

How does a nerve impulse work?

Nerve impulses begin in a dendrite, move toward the cell body, and then move down the axon. A nerve impulse travels along the neuron in the form of electrical and chemical signals. The axon tip ends at a synapse. A synapse is the junction between each axon tip and the next structure.

How does the nervous system determine the intensity of a stimulus?

In order to gauge stimulus intensity, the nervous system relies on the rate at which a neuron fires and how many neurons fire at any given time. A neuron firing at a faster rate indicates a stronger intensity stimulus. Numerous neurons firing simultaneously or in rapid succession would also indicate a stronger stimulus.

Which is the maximal stimulus for muscle contraction?

At threshold just a few muscle fibers are being recruited. By definition, the maximal stimulus is seen when 100% of recruitable fibers are contracting. Above maximal stimulus, the number of contracting fibers cannot increase. Question: Why does varying the stimulus strength affect the twitch force?

When does an action potential occur in a neuron?

If a stimulus is strong enough, an action potential occurs and a neuron sends information down an axon away from the cell body and toward the synapse. Changes in cell polarization result in the signal being propagated down the length of the axon. The action potential is always a full response.

When does a nerve or muscle fiber fire?

If a stimulus is above a certain threshold, a nerve or muscle fiber will fire. Essentially, there will either be a full response or there will be no response at all for an individual neuron or muscle fiber.