What is the simplest kind of 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.
What is a simple reflex?
A simple reflex contains only one space where information in the spinal cord travels between two nerve cells, called neurons. This quick response is called a reflex, and reflexes occur without conscious thinking or planning, meaning the brain is not involved in them.
What is a simple reflex arc a level?
A reflex arc is a pathway along which impulses are transmitted from a receptor to an effector without involving ‘conscious’ regions of the brain. As it does not involve the brain, a reflex response is quicker than any other type of nervous response.
What is reflex action short answer?
A reflex action is an automatic (involuntary) and rapid response to a stimulus, which minimises any damage to the body from potentially harmful conditions, such as touching something hot. A reflex action follows this general sequence and does not involve the conscious part of the brain.
What is a reflex arc quizlet?
Definition : A reflex arc is the nerve pathway which makes such a fast, automatic response possible. How a reflex arc works: Sensory neuron from spinal cord touches/feels receptor.
What are the three steps of a reflex arc?
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).
How does a reflex arc work a level?
Reflex arcs 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. Relay neurons connect sensory neurons to motor neurons. Motor neuron sends electrical impulses to an effector.
What are the 5 steps to a reflex arc?
Answer Wiki. A simple reflex arc has five steps: A stimulus: An outside force that does something. Afferent , or sensory neurons, carry the impulse to the spinal cord. Interneurons in the spinal cord integrate and plan a response. Efferent, or motor neurons, carry out the response. The effector response is the action carried out.
How does a simple reflex arc work?
A reflex arc is a type of nerve pathway that connects certain muscle groups to others without involving the brain. Tapping the petellar tendon with a reflex hammer will trigger the knee jerk reflex. Nerve impulses in reflex situations travel along sensory neurons. In the case of most nerve signals, stimulated cells send a message to the brain.
What are the 5 parts of a reflex arc?
The reflex arc is made up of five basic elements. These include the receptor, the sensory neuron, center, the motor neuron, and the effector. The receptor hosts the dendrite of the sensory neuron as well as the initiation of the entire process, the initiation of nerve impulse.
What is an example of a reflex arc?
Examples of monosynaptic reflex arcs in humans include the patellar reflex and the Achilles reflex. Most reflex arcs are polysynaptic, meaning multiple interneurons (also called relay neurons) interface between the sensory and motor neurons in the reflex pathway.