Question

Describe reflex action and reflex arc.

Answer 1

The main elements of the reflex arc are sensory neurons (or receptors) which are stimulated and connected to other nerve cells, which activate muscle cells (or effectors), and which then perform reflex activity.

Complete answer:
REFLEX ACTION: A reflex, also known as a reflex movement, is a necessary and almost instantaneous development as a result of an improvement. A reflex is made possible by reflex curves, which are neuronal mechanisms that can follow up on a motivation until it reaches the mind.
Such examples are: The pupil of the eye changes scale as light acts as a boost. As a result of nasal irritations, you can experience hacking or wheezing. Knees jerk as a result of a blow or someone walking on your knee.
REFLEX ARC: A reflex curve is a nerve pathway that includes, at its most basic level, a tangible nerve and an engine nerve connected by a neurotransmitter.

1. Receptor or tactile organ,
2. Sensory neuron,
3. Reflex centre (brain or spinal cord),
4. Motor neuron, and
5. Effectors make up the reflex curve (muscle or organ).
   The direction followed by the nerve driving forces during a reflex is known as a reflex circular fragment. The majority of reflexes are spinal reflexes with channels that only reach the spinal cord.
   While data is sent to the cerebrum during a spinal reflex, the spinal line, not the mind, is responsible for the synchronisation of tangible data and a response transmitted to motor neurons.
   The following segments make up a reflex arc:
   The receptor (typically a dendrite) is the part of the neuron that detects an increase.
   The spinal cord receives the push from the tangible neuron.
   In the dim matter of the spinal cord, the reconciliation population consists of one neurotransmitter (single reflex circular segment) or at least two neural connections (polysynaptic reflex curve).
   A motor neuron transmits a nerve impulse from the spinal cord to a peripheral location.
   An effector is a muscle or organ that receives the engine neuron's drive structure.
   Skeletal muscle is the effector of substantial reflexes.
   The effector in autonomic (instinctive) reflexes.
   Smooth or cardiovascular muscle, or an organ, is the effector in autonomic (instinctive) reflexes.

Note:
An example of this that is often used to assess the condition of a person who has suffered a head injury is: The pupillary light reflex is the choking of understudies caused by bright light. If light shines directly into one eye, the understudy in that eye will contract, but the student in the non-enlightened eye will also contract. The optic nerve, which senses light, and the oculomotor nerve, which tightens the two understudies, are also involved in this reflex.