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

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

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

Poikilotherm
An Organism Whose Body Temperature Varies With Environmental Conditions.

Circulatory System
An Organ System That Transports Nutrients, Gases, And Wastes Through Blood Vessels.

Heart
A Muscular Organ In The Circulatory System That Pumps Blood Throughout The Body.

Neurotransmitter
A Chemical Released By Neurons To Transmit Signals Across Synapses In The Nervous Organ System.

Nervous System
An Organ System That Detects Stimuli And Coordinates Responses Using Neurons And Neurotransmitters.

Secondary Consumer
A Carnivorous Consumer That Feeds On Primary Consumers.

Neuron
A Specialized Cell That Transmits Electrical And Chemical Signals In The Nervous System.