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.

When neurons are stimulated they transmit an electrical impulse. The pathway followed is: stimulus —> dendrite –> cell body –> axon –> axon terminal –> passage of stimulus.

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.

Reflex arcs For example, a simple reflex arc happens if we accidentally touch something hot. 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.

When the receptor detects the stimulus, it excites a sensory neuron. The message travels through the sensory neuron to an interneuron in the central nervous system (labeled control center). The message travels through the interneuron to a motor neuron. The message travels through the motor neuron to the effector.

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.

So the reflex arc consists of these five steps in order-sensor, sensory neuron, control center, motor neuron, and muscle. These five parts work as a relay team to take information up from the sensor to the spinal cord or brain and back down to the muscles.

Most reflex arcs have five main components: receptors, sensory neurons, interneurons, motor neurons and muscles.

The reflex arc

• 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).

spinal cord

What is another word for reflex?

Stimulus, sensory neuron, intermediary neuron, motor neuron and defector organ is the correct order of general 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.

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 motor pathway transmits the signal from motor neurons to the effector organs (muscles and glands etc).

three neurons

Synapse – The junction between the axon of one neuron and the dendrite of another, through which the two neurons communicate.

The simplest example of a spinal reflex is the monosynapic reflex arc, having four components:

• A receptor (in this case, the muscle spindle).
• An afferent component (sensory input).
• A central component (spinal processing).
• An efferent component (motor output).

The speed is affected by 3 factors:

• Temperature – The higher the temperature, the faster the speed.
• Axon diameter – The larger the diameter, the faster the speed.
• Myelin sheath – Only vertebrates have a myelin sheath surrounding their neurones.

Nerve impulses are extremely slow compared to the speed of electricity, where the electric field can propagate with a speed on the order of 50–99% of the speed of light; however, it is very fast compared to the speed of blood flow, with some myelinated neurons conducting at speeds up to 120 m/s (432 km/h or 275 mph).

The two main factors are insulation by the myelin sheath and the diameter of the axon.

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.

synapse

What is another word for neuron?

For neurons in the brain, at least, this isn’t an easy question to answer. For the spinal cord though, we can say that there are three types of neurons: sensory, motor, and interneurons.

A nerve is an enclosed, cable-like bundle of axons (the projections of neurons) in the peripheral nervous system (PNS). A nerve provides a structured pathway that supports the electrochemical nerve impulses transmitted along each of the axons.

The neuron is the basic working unit of the brain, a specialized cell designed to transmit information to other nerve cells, muscle, or gland cells. Neurons are cells within the nervous system that transmit information to other nerve cells, muscle, or gland cells.

Neurons are programmed to do different things Sensory: Sensory neurons deliver electrical signals from the outer parts of the body — the glands, muscles, and skin — into the CNS. Motor: Motor neurons carry signals from the CNS to the outside parts of the body.