Table of Contents
- 1 Where are reflex actions coordinated?
- 2 What is the coordinator in a reflex action?
- 3 Which part of the nervous system controls reflex action?
- 4 What is the coordinator in the nervous system?
- 5 What are the 5 parts of the reflex arc?
- 6 Where are the reflexes in your body?
- 7 How is a Reflex Impulse sent to the muscles?
- 8 What is a reflex action?
Where are reflex actions coordinated?
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 the coordinator in a reflex action?
However, in a reflex action the coordinator is a relay neurone either in the spinal cord or in the unconscious areas of the brain. The whole reflex is very fast indeed. An impulse also travels up the spinal cord to the conscious areas of your brain.
What is the path of a reflex impulse?
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.
Which part of the nervous system controls reflexes?
The part of the brain that controls reflexes is the cerebellum. The cerebellum regulates motor reflexes and is also involved in the synchronization of balance and muscles. The brainstem links and transmits messages to the spinal cord from the brain, regulating functions such as respiration, heart rate, and alertness.
Which part of the nervous system controls reflex action?
(a)Spinal cord controls the reflex arcs.
What is the coordinator in the nervous system?
The central nervous system, sometimes referred to as “the coordinator”, consists of the brain and the spinal cord. It is responsible for making sense of the messages it receives from the peripheral nervous system and sending “instructional messages” back to all parts of the body.
What does the coordination Centre consist of?
Coordination centres include the brain, spinal cord and pancreas. These organs will signal to an effector (a muscle or gland) by releasing an electrical impulse along a motor neuron.
Where would the nerve impulse start in this reflex arc?
the spinal cord
Most reflex arcs involve only three neurons. The stimulus, such as a needle stick, stimulates the pain receptors of the skin, which initiate an impulse in a sensory neuron. This travels to the spinal cord where it passes, by means of a synapse, to a connecting neuron called the relay neuron situated in the spinal cord.
What are the 5 parts of the reflex arc?
The reflex arc consists of 5 components:
- sensory receptor.
- sensory neuron.
- integration center.
- motor neuron.
- effector target.
Where are the reflexes in your body?
Many reflexes start at the muscle or skin and go to the spinal cord. When the action potential reaches the nerve ending, the signal is transferred to another neuron, such as an interneuron or motor neuron. The action potential then travels outside the spinal cord to a muscle.
Is the enteric nervous system part of the central nervous system?
The enteric nervous system (ENS) is a large division of the peripheral nervous system (PNS) that can control gastrointestinal behaviour independently of central nervous system (CNS) input. Mammalian neurons are located in either the CNS (brain and spinal cord) or PNS (cells with soma outside the brain and spinal cord).
Which nerves transmit impulses from the central nervous system?
Afferent, or sensory, neurons carry impulses from peripheral sense receptors to the CNS. They usually have long dendrites and relatively short axons. Efferent, or motor, neurons transmit impulses from the CNS to effector organs such as muscles and glands.
How is a Reflex Impulse sent to the muscles?
Answers: In reflex actions, a reflex arc is formed by impulses from the receptor reaching the spinal cord and the appropriate reflex impulse then being sent to the muscles by the spinal cord. The impulse is not sent to the brain, to reduce response time.
What is a reflex action?
A reflex action is a protective, automatic and rapid response to a stimulus. It follows the same general sequence as a normal reaction but often it does not involve the brain. Instead, the spinal cord coordinates the response so the impulse can reach the effector quickly. The nerve pathway followed by a reflex action is called a reflex arc.
How does the spinal cord coordinate the response to impulses?
Instead, the spinal cord coordinates the response so the impulse can reach the effector quickly. The nerve pathway followed by a reflex action is called a reflex arc. The process is:
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.