Stimulus, Receptor, Coordination Center, Effector, Response
Structure of the reflex arc and importance of reflex actions
Reflex arc involves stages: Stimulus detected by a receptor, electrical impulse passed along sensory neuron to CNS, chemical released at synapse, electrical impulse triggered in relay neuron, impulse passed to motor neuron, effector (muscle) contracts, response (e.g., pulling hand away from heat)
Reflexes help protect us from danger
Central nervous system
Acts as a coordinator in most cases, making decisions about actions to take
Structure of the nervous system related to its functions
Nervous system consists of two parts: Central Nervous System (CNS) - brain and spinal cord, and other nerves running to and from the CNS
Homeostasis
Keeping internal conditions as constant as possible
Sensory neurons
Connected to receptors, allowing us to sense our environment
Reflexes
No decision-making by the conscious part of the brain, making them automatic and rapid
