Table of Contents
What is the pathway of an impulse 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).
How is a nerve impulse started?
A nerve impulse is a sudden reversal of the electrical charge across the membrane of a resting neuron. It begins when the neuron receives a chemical signal from another cell. The signal causes gates in sodium ion channels to open, allowing positive sodium ions to flow back into the cell.
What is the function of the efferent pathway?
Efferent pathways carry signals away from the central nervous system. Essentially, they are signals that your brain sends to tell your body to do something, like blinking. Afferent signals come from outside stimuli and tell your brain what they are sensing, such as temperature.
What is the function of the 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.
How does a nerve impulse travel from one neuron to another?
The impulses travel from one neuron to another neuron or body cell by the movement of the neurotransmitters. A nerve impulse traveling through the axon (a long, slender projection arising from the nerve cell) eventually reaches the axon terminal, and then the synaptic knob or terminal button.
What is the simplest nerve pathway called?
One of the simplest neural pathways is the mono-synaptic. reflex pathway . Only two neurons are involved in this pathway. The sensory component (sensory neuron) of the pathway has its receptors on muscles and motor component (motor neuron) is present in the spinal cord.
What is a nerve cell that transmits a nerve impulse?
The function of a neurone is to transmit impulses from their origin to destination. The nerve fibres of a neurone are not actually joined together and, therefore, there is no anatomical continuity between one neurone and another. The junction where nerve imulses are transmitted from one neurone to another is called a synapse.
What is part of a neuron generates nerve impulse?
The axon is the conducting region of the neuron. It generates nerve impulses (action potentials) and transmits them, typically away from the cell body, along the axolemma (cell membrane of the axon). Nice work!