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What is the correct order of impulse conduction through a reflex arc?

What is the correct order of impulse conduction through a reflex arc?

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

What is the beginning of a reflex arc?

The reflex arc is a special type of neural circuit that begins with a sensory neuron at a receptor (e.g., a pain receptor in the fingertip) and ends with a motor neuron at an effector (e.g., a skeletal muscle).

How are impulses transmitted in a 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 the first structure stimulated in a reflex arc?

The primary components of the reflex arc are the sensory neurons (or receptors) that receive stimulation and in turn connect to other nerve cells that activate muscle cells (or effectors), which perform the reflex action.

What are the 5 components of the reflex arc?

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

Does the reflex arc involve the brain?

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. Reflexes do not require involvement of the brain, although in some cases the brain can prevent reflex action.

What is the function of 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.

Why is the reflex arc important?

The reflex arc is essential in producing a quick involuntary response aimed to prevent injury in an individual.

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

What is the pathway of reflex arc?

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.

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 the pathway of nerve impulses?

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.

What is an efferent pathway?

Nerve structures through which impulses are conducted from a nerve center toward a peripheral site. Such impulses are conducted via efferent neurons (NEURONS, EFFERENT), such as MOTOR NEURONS, autonomic neurons, and hypophyseal neurons.

What cells are ciliated and function to move CSF?

IX. Ependymal cells line the brain ventricles and central canal of the spinal cord (Figs. 15, E, and 19). They arise from the pseudostratified neuroepithelium from which neurons and neuroglial cells originate. That surface is ciliated here and there, and some cilia are seen in the ependyma.

What type of cell makes cerebrospinal fluid?

ependymal cells

Which type of cell is found in the greatest amount in the nervous system?


What cells in the central nervous system have cilia that move in order to circulate cerebrospinal fluid?

In the CNS, multiplesecondary cilia on ependymal cells lining the ventricles regulate the flow of cerebrospinal fluid (see text). (B) A ciliary segment joins the outer and inner segments (OS and IS) of the retinal photoreceptor and has the 9+0 configuration of a primary cilium.

What does the central nervous system use to determine strength of stimulus?

Frequency of action potentials determines the strength of a stimulus The frequency of action potentials is located in a sensory neuron. The neuron codes the strength of a stimulus using the frequency of the action potentials. Since stimulus is measured in frequency the nervous system is frequency-modulated.

What is a bundle of nerve fibers located outside the central nervous system?

Anatomy and Physiology of the Nervous System

nerve is a group or bundle of fibers located outside the central nervous system that connect the brain and spinal cord with various parts of the body
afferent neurons carry impulses to the brain and spinal cord from the skin and sense organs.

What is the function of an astrocyte?

Astrocytes are the most numerous cell type within the central nervous system (CNS) and perform a variety of tasks, from axon guidance and synaptic support, to the control of the blood brain barrier and blood flow.

What are the two types of astrocytes?

Astrocytes are literally star-shaped cells of the nervous system. They play a major role in the support and function of our nerve cells, or neurons. The two main types of astrocytes are the ones found in the white matter, called fibrous astrocytes, and the ones found in the gray matter, the protoplasmic astrocytes.

What is the main function of oligodendrocytes?

Oligodendrocytes are specialized glial cells that wrap themselves around neurons present in the CNS. Oligodendrocytes are primarily responsible for maintenance and generation of the myelin sheath that surrounds axons.

What is the origin and function of astrocyte?

Astrocytes were first described by Virchow in 1846 and were originally thought to be a homogenous population of cells which function to support neurons [1].

Why is it called astrocyte?

Astrocytes get their name because they are “star-shaped”. They are the most abundant glial cells in the brain that are closely associated with neuronal synapses.

What does astrocyte mean?

Astrocyte, star-shaped cell that is a type of neuroglia found in the nervous system in both invertebrates and vertebrates. Astrocytes can be subdivided into fibrous and protoplasmic types. Fibrous astrocytes are prevalent among myelinated nerve fibres in the white matter of the central nervous system.

What is the main pathway for transmitting information between the brain and the body?

brainstem is pathway for impulse conduction between brain and spinal cord. brainstem is origin of 10 of 12 pairs of cranial nerves and controls respiration, blood pressure and heart rate.