Effector
Reflex action
Stretch Reflex
Involuntary muscle action. Examples include the beating of the heart, digestion in the stomach, and reflex actions like blinking or sneezing.
The effector muscle for the calcaneal reflex (also known as the Achilles reflex) is the gastrocnemius muscle in the calf. When the Achilles tendon is tapped, it causes a contraction of the gastrocnemius muscle, resulting in plantar flexion of the foot.
In the reflex arc, a muscle or gland is considered to be the effector. Its role is to respond to the stimulus provided by the sensory neuron and produce the appropriate action, such as muscle contraction or gland secretion.
A reflex action is a fast, automatic response to a stimulus by an effector organ i.e. a muscle.
No it is not a reflex action
Fixator
Both require motor neurones to carry the nerve impulse to the effector in order for the muscle to contract carry out an action.
The knee-jerk reflex is a type of stretch reflex, which is a type of spinal reflex. It involves the stimulation of sensory neurons in the muscle spindles of the quadriceps muscle, leading to a quick contraction of the muscle in response to a sudden stretch.
It's called the stretch reflex and involves muscle spindles which are sensorimotor organs located in skeletal muscle.
If the muscle crosses a joint (most do), then the joint acts as a pivot.