Table of Contents
- 1 What is the pathway a reflex impulse travels?
- 2 What is the pathway of a reflex in the nervous system?
- 3 How do synapses determine the direction of nerve impulse?
- 4 What is the stimulus response pathway?
- 5 What is the correct order of events of a simple stretch reflex?
- 6 Why do nerve impulses travel one direction?
- 7 How does the nerve impulse travel through the reflex arc?
- 8 How does the neural pathway control the reflexes?
What is the pathway a reflex impulse travels?
A reflex arc defines the pathway by which a reflex travels—from the stimulus to sensory neuron to motor neuron to reflex muscle movement.
What is the pathway of a reflex in the nervous system?
The anatomical pathway of a reflex is called the reflex arc. It consists of an afferent (or sensory) nerve, usually one or more interneurons within the central nervous system, and an efferent (motor, secretory, or secreto-motor) nerve. Most reflexes have several synapses in the reflex arc.
What are the 5 steps in the reflex pathway?
So the reflex arc consists of these five steps in order-sensor, sensory neuron, control center, motor neuron, and muscle.
What are the steps of nerve impulse transmission?
The action potential travels rapidly down the neuron’s axon as an electric current and occurs in three stages: Depolarization, Repolarization and Recovery. A nerve impulse is transmitted to another cell at either an electrical or a chemical synapse .
How do synapses determine the direction of nerve impulse?
Nerve impulses travel in one direction from the pre-synaptic to the post-synaptic neuron across a gap called a synapse. This is done to continue a nerve impulse so that it can reach its destination in the body. The process requires the use of a neurotransmitter, one of the most common is acetylcholine (ACh).
What is the stimulus response pathway?
The basic pathway for a nerve impulse is described by the stimulus response model. 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.
How does the neural pathway of the flexor reflex compare with that of the tendon reflex?
T or f : the neural pathway of a pathway of a flexor reflex is more complex than that for the tendon reflex. During a crossed extension reflex , which nerve fibers cross to the contralateral side? An ——-reflex arc is a reflex arc in which the input and output occur at different levels of the spinal cord.
What are the 4 steps of a reflex action?
- Receptor in the skin detects a stimulus (the change in temperature).
- Sensory neuron sends electrical impulses to a relay neuron, which is located in the spinal cord of the CNS.
- Motor neuron sends electrical impulses to an effector.
- Effector produces a response (muscle contracts to move hand away).
What is the correct order of events of a simple stretch reflex?
Stretch Reflex. When a muscle is stretched (1), muscle spindles (2) send information to the spinal cord (3) where it synapses on motor neuron of the same muscle (4) causing it to contract (5). At the same time, stimulation of an inhibitory interneuron (6) prevents contraction of the antagonistic muscle (7 and 8).
Why do nerve impulses travel one direction?
Nerve impulse travels in one direction because nerve cells (neurons) connect to each other by synapse. The action potential starts at the axon end (by stimulation from another nerve) and travel along a neurone to the synapse end. …
How does an action potential travel in a nerve?
The action potential travels down the axon as the membrane of the axon depolarizes and repolarizes. Nodes of Ranvier are gaps in the myelin along the axons; they contain sodium and potassium ion channels, allowing the action potential to travel quickly down the axon by jumping from one node to the next.
How are impulses transmitted across a synapse GCSE?
1) An electrical impulse travels along an axon of the presynaptic neuron. 2) When the impulse reaches the nerve-ending, it releases chemical messengers called neurotransmitters. 3) These chemicals diffuse across the synapse and bind with specific receptor molecules on the membrane of the next neuron.
How does the nerve impulse travel through the reflex arc?
The nerve impulse travels through the reflex arc. It travels from the sensor through the sensory neurone, through the spinal cord and motor neurone to the effector muscle. Home Science Math and Arithmetic
How does the neural pathway control the reflexes?
The neural pathway that controls the reflexes occurs through the reflex arc. It acts on an impulse even before it reaches the brain. There are some stimuli that require an automatic, instantaneous response without the need of conscious thought. The following diagram shows the reflex arc pathway.
How does a nerve impulse travel from one neuron to another?
An axon of one neuron will send a message to the dendrite of another neuron, almost like fitting together pieces in a jigsaw puzzle. However, a small space appears there, and this is the synapse. The nerve impulse will travel down the length of the neuron to the end of the axon.
What is an example of a sensory motor pathway?
The sensory component (sensory neuron) of the pathway has its receptors on muscles and motor component (motor neuron) is present in the spinal cord. Knee jerk reflex is a classic example of this pathway. This reflex is produced when we stimulate third, fourth and fifth lumbar nerves. Knee jerk reflex can