What are the 4 steps of a reflex action?
The reflex arc
- A receptor in the skin detects a stimulus (the change in temperature).
- Sensory neurones send electrical impulses to relay neurones, which are located in the spinal cord.
- Motor neurones send electrical impulses to an effector.
- The effector produces a response (muscle contracts to move hand away).
What is Disynaptic reflex?
The alpha motor neuron fires to contract the extensor muscle, until the Golgi tendon organ is activated, thereby inhibiting the alpha motor neuron and causing the leg to drop. Because this reflex contains an interneuron between the sensory afferent and the motor neuron, it is an example of a disynaptic reflex.
What is the order of a reflex arc?
Stimulus, sensory neuron, intermediary neuron, motor neuron and defector organ is the correct order of general reflex arc.
What is a reflex action in biology?
In biology, a reflex, or reflex action, is an involuntary, unplanned sequence or action and nearly instantaneous movement in response to a stimulus. A reflex is made possible by neural pathways called reflex arcs which can act on an impulse before that impulse reaches the brain.
What is a myotatic reflex?
The stretch reflex or myotatic reflex refers to the contraction of a muscle in response to its passive stretching. When a muscle is stretched, the stretch reflex regulates the length of the muscle automatically by increasing its contractility as long as the stretch is within the physiological limits.
Which is the effector organ of the reflex arc?
In the case of the reflex arc, the effector organ is almost always a muscle fiber or a group of muscle fibers. It is innervated by a motor neuron carrying information about the response. In most of the cases, three neurons are involved in a reflex arc.
How tall is a reflex Bighorn compound bow?
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Are there more than one synapse in the reflex arc?
Monosynaptic reflexes: Only one synapse is present in the reflex arc. These reflexes involve a sensory neuron and an effector neuron. Peripheral muscle reflexes like the patellar reflex, brachial reflex are monosynaptic reflexes Polysynaptic reflexes: The include more than one chemical synapse in the reflex arc.
How many neurons are involved in the brachial reflex?
Peripheral muscle reflexes like the patellar reflex, brachial reflex are monosynaptic reflexes Polysynaptic reflexes: The include more than one chemical synapse in the reflex arc. They involve at least three neurons in the reflex action.