A reflex arc refers to the neural pathway that a nerve impulse follows. The reflex arc typically consists of five components (3): ... The receptor at the end of a sensory neuron reacts to a stimulus . 2. The sensory (afferent) neuron conducts nerve impulses along an afferent pathway towards the central nervous system (CNS).
What is the typical sequence of a reflex arc?
Stimulus, sensory neuron, intermediary neuron, motor neuron and defector organ is the correct order of general reflex arc.
What are the 5 components of a reflex arc?
FIGURE 7-1 A reflex arc contains five fundamental components: 1, a receptor; 2, a sensory neuron; 3, one or more synapses in the CNS; 4, a motor neuron ; and 5, a target organ, usually a muscle.
What is the most basic reflex arc?
The simplest arrangement of a reflex arc consists of the receptor , an interneuron (or adjustor), and an effector; together, these units form a functional group. Sensory cells carry input from the receptor (afferent impulses) to a central interneuron, which makes contact with a motor neuron.
How do you describe a reflex arc?
A reflex arc is a neural pathway that controls a reflex . In vertebrates, most sensory neurons do not pass directly into the brain, but synapse in the spinal cord. This allows for faster reflex actions to occur by activating spinal motor neurons without the delay of routing signals through the brain.
What is not required for a reflex arc?
A reflex does not require any thought input . The path taken by the nerve impulses in a reflex is called a reflex arc. In higher animals, most sensory neurons do not pass directly into the brain, but synapse in the spinal cord.
Why is reflex arc important?
The reflex arc is essential in producing a quick involuntary response aimed to prevent injury in an individual .
What is the correct order of steps in a reflex arc quizlet?
Place the following events of a reflex arc in the correct order: 1) motor neuron activation, 2) sensory neuron activation, 3) sensory receptor activation, 4) Information processing, 5) effector response.
What is reflex arc explain with diagram?
A reflex arc is a simple nervous pathway which is responsible for the sudden reaction known as the reflex action . The afferent/sensory neurons are present in the receptor organ which receive the stimulus. The neuron transmits the sensory information from receptor organ to the spinal cord.
What are the steps of a reflex?
- A receptor in the skin detects a stimulus (the change in temperature).
- Sensory neurones send electrical impulses to relay neurones, which are located in the spinal cord. ...
- Motor neurones send electrical impulses to an effector.
- The effector produces a response (muscle contracts to move hand away).
What will happen if we don’t have reflex action?
Most reflexes don’t have to travel up to your brain to be processed , which is why they take place so quickly. A reflex action often involves a very simple nervous pathway called a reflex arc. ... If the reaction is exaggerated or absent, it may indicate a damage to the central nervous system.
What occurs during the reflex arc?
Reflex arcs
Sensory neuron sends electrical impulses to a relay neuron , which is located in the spinal cord of the CNS. Relay neurons connect sensory neurons to motor neurons. Motor neuron sends electrical impulses to an effector. Effector produces a response (muscle contracts to move hand away).
What is reflex arc class 10th?
The reflex arc describes the pathway in which the nerve impulse is carried and the response is generated and shown by the effector organ.
Do reflexes involve the brain?
This quick response is called a reflex, and reflexes occur without conscious thinking or planning, meaning the brain is not involved in them .
What are the 4 types of reflexes?
In our discussion we will examine four major reflexes that are integrated within the spinal cord: the stretch reflex, the Golgi tendon reflex, the withdrawal reflex and the crossed extensor reflex .
What is a Polysynaptic reflex?
Any reflex with more than one synapse (1), not counting the synapse between neuron and muscle, and hence involving one or more interneurons. In humans, all reflexes except stretch reflexes are polysynaptic.
