Poikilotherm
An Organism Whose Body Temperature Varies With Environmental Conditions.

Homeotherm
An Organism That Maintains A Stable Internal Body Temperature Regardless Of Environment.

Gland
An Organ In The Endocrine System That Produces And Releases Hormones.

Endocrine System
An Organ System That Produces Hormones To Regulate Body Processes.

Reflex Arc
A Neural Pathway That Controls A Rapid, Automatic Response To A Stimulus.

Peripheral Nervous System
The Part Of The Nervous System Outside The Brain And Spinal Cord.

Central Nervous System
The Part Of The Nervous System Consisting Of The Brain And Spinal Cord.

Action Potential
An Electrical Signal That Travels Along The Axon Of A Neuron.

Synapse
A Junction Between Two Neurons Where Neurotransmitters Are Released.

Dendrite
A Branch Like Extension Of A Neuron That Receives Signals From Other Neurons.