BRAINCAKEReflex Arc
The body can respond to dangerous situations without conscious thought. A reflex action is a rapid, involuntary response that minimises damage to the body.
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Key terms in this lesson
- action potential
- A rapid, temporary reversal of the electrical charge across an axon membrane (depolarisation followed by repolarisation) that occurs when a stimulus exceeds the threshold value.
- effector
- A muscle or gland that brings about a response to a nerve impulse or hormone.
More in Neuronal Communication
- Sino-Atrial Node
- Contraction of the Heart
- Autonomic Control of the Heart Rate
- Chemoreceptors
- Pressure Receptors
- Taxes
- Kinesis
- Tropisms
All 38 lessons in Neuronal Communication · All AQA A-level Biology topics