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29 Terms

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Cell
The smallest unit of life, specialized to perform particular tasks.
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Tissue
A group of cells working together to perform a specific function.
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Organ
A group of tissues that carry out a function.
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Organ system
Two or more organs working together to perform body functions.
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Organism
A living individual that consists of organized systems and functions.
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Endocrine System
Regulates body processes through hormone production.
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Respiratory System
Responsible for gas exchange between the internal and external environment.
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Nervous System
Controls thinking, memory, and body movements.
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Cardiovascular System
Circulates blood which transports gases, nutrients, hormones, and wastes.
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Digestive System
Converts food into simpler molecules for cellular use.
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Immune System
Helps the body defend against disease.
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Lymphatic System
Maintains fluid balance and helps fight infection.
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Urinary System
Filters blood and excretes waste from the body.
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Integumentary System
Provides protection against the external environment.
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Muscular System
Produces movement and circulates blood.
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Skeletal System
Supports the body and protects internal organs.
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Homeostasis
The regulation and maintenance of a constant internal environment within the body.
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Negative Feedback
Works to prevent an excessive response to a stimulus, returning levels to a set point.
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Positive Feedback
Amplifies the initiating stimuli, moving the system away from its starting state.
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Pathogens
Disease-causing microorganisms that can be transmitted via various means.
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Antibody
A large Y-shaped protein used to identify specific pathogens, produced by white blood cells.
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Antigen
A substance that induces an immune response.
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Nephron
The functional unit of the kidney that produces urine.
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Epithelial Tissue
Covers body surfaces and lines cavities.
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Connective Tissue
Supports and binds other tissues and organs.
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Muscle Tissue
Enables movement through contraction.
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Nervous Tissue
Transmits impulses and processes information.
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Glucose Homeostasis
The process of maintaining balanced glucose levels in the blood.
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Fight or Flight Response
The body's physiological reaction to perceived harmful events, attacks, or threats.