Questions and Answers
Homeostasis
Organisms' response and adaptation to the environment
Coordinated response requires
stimulus, receptor, and effector
Stimuli
Detectable changes in the environment
Receptors
Detect stimuli and signal changes
Effectors
Cause response to stimuli
Nervous system
Sends electrical messages via nerves
Endocrine system
Secretes hormones directly into the bloodstream
Central nervous system
brain and spinal cord
Sense organs
Linked to CNS by nerves
Neurotransmitters
Carry chemical signals between nerve cells
Sensory neuron
Transmits impulses from receptor to CNS
Motor neuron
Transmits impulses from CNS to effector
Relay neuron
Connects sensory and motor neurons