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Effector
Reflex action
gastrocnemius
Stretch Reflex
Involuntary and reflex actions
Conscious action is a voluntary action that is controlled by the brain and involves awareness and decision-making, such as raising your hand. Reflex action is an involuntary action that is controlled by the spinal cord and occurs without conscious thought, such as quickly pulling your hand away from a hot surface.
Conscious action is a voluntary action that is initiated and controlled by our conscious thoughts and decisions, while reflex action is an involuntary and automatic response to a stimulus that involves a specific neural pathway without requiring conscious thought. Conscious actions are typically intentional and involve higher levels of cognitive processing, whereas reflex actions are rapid and predictable responses designed to protect the body from harm.
No it is not a reflex action
A reflex action is a fast, automatic response to a stimulus by an effector organ i.e. a muscle.
Both require motor neurones to carry the nerve impulse to the effector in order for the muscle to contract carry out an action.
It's called the stretch reflex and involves muscle spindles which are sensorimotor organs located in skeletal muscle.
This particular reflex is autonomic as the affected muscle, constrictor pupillae muscle, is a smooth muscle and not under conscious control. Typically if you can consciously contract the muscle, any reflex associated with that muscle is somatic in nature.