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Internal Anatomy of Fish Smooth Muscle Cell Tissue Cell Tissue Organ Stomach Smooth Muscle Cell Organization of Life Organ System Organism Fish Fish Digestive System Integumentary System • Skin • Most general function is protection and coloration Parts of the Integumentary System • Epidermis – Constantly regenerating • Mucus Layer – Helps slide through water – Rids fish of parasites • Scales – Give fish their color – Can help you determine age Skeletal System • • • • Class Osteichthyes: Bones & Cartilage Class Chondricthyes: Cartilage General function is support and movement Also protects inner organs Muscular System • General function is movement • 3 types of muscles – Skeletal • Moving on purpose • Voluntary – Smooth • Controls inner organs • Involuntary – Cardiac • Move blood • Involuntary Digestive System • General function is to process food and use for nutrients/energy. • • • • Mouth Esophagus Digestive Tube Digestive Glands (make enzymes or store them) – Liver, pancreas, gall bladder • Anus Respiratory System • General Function is oxygen and carbon dioxide exchange Gills – Gill raker keeps food from leaving mouth through gills – Gill filaments is where gas exchange occurs Gas bladder – Fills with air to keep fish buoyant Circulatory System • General function is to transport body fluids • Heart – 1st place blood is pumped is to the gills • Arteries (Away from heart) • Capillaries (Gas and nutrient exchange) • Veins (Toward heart) Excretory System • General function is to remove waste from blood • Uses kidneys Reproductive System • General function is to perpetuate the species Nervous System • General function is sensing, coordination of movements, and response to stimuli. – Composed of brain, nerves, lateral line, eyes, ears, and nose Fish Brain! 1. Olfactory Lobes (smelling) 2. Cerebrum (smelling and other senses) 3. Optic Lobes (sight, sound, and lateral line senses) 4. Cerebellum (muscle coordination) 5. Spinal Cord (connects all muscles and nerves to the brain) Endocrine System • General function is chemical regulation of hormones. • Hormones can: – Control rate of growth – Control development of sex characteristics – Control capacity to respond to light and stress