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UNIT 3

UNIT 3. The interaction function. THE MOVEMENTS OF ANIMALS. Natural Science 2. Secondary Education. UNIT 3. The movements of animals. WHEN MUSCLES CONTRACT THEY PRODUCE MOVEMENTS:. VOLUNTARY (LOCOMOTOR SYSTEM). INVOLUNTARY. INVERTEBRATES WITH NO EXOSKELETONS. ARTHROPODS. ECHINODERMS.

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UNIT 3

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  1. UNIT3 The interaction function THE MOVEMENTS OF ANIMALS Natural Science 2. Secondary Education

  2. UNIT3 The movements of animals WHEN MUSCLES CONTRACT THEY PRODUCE MOVEMENTS: VOLUNTARY(LOCOMOTORSYSTEM) INVOLUNTARY INVERTEBRATESWITH NOEXOSKELETONS ARTHROPODS ECHINODERMS VERTEBRATES Click on each box to find out more Natural Science 2. Secondary Education

  3. UNIT3 The movements of animals Involuntary movements • These occur in the internal organs. • An example is the beating of a heart. The movement of the heart pumps blood around the organism. Go back to the Start menu Natural Science 2. Secondary Education

  4. UNIT3 The movements of animals Voluntary movements • These are carried out by the locomotor system. • They allow an animal to move from one place to another. Go back to the Start menu Natural Science 2. Secondary Education

  5. UNIT3 The movements of animals The locomotor system in invertebrates with no exoskeleton • The muscles form part of the walls of the body. • By contracting them, the animal’s shape changes and it can move. 1: When squid’s muscles relax, water enters its body. 2: When muscles contract, shooting out water, the animal is propelled backwards. Go back to the Start menu Natural Science 2. Secondary Education

  6. UNIT3 The movements of animals The locomotor system in arthropods • Their muscles are connected to the internal side of the articulated exoskeleton. 2: When these muscles contract, they pull on parts of the exoskeleton (in this case, the wings), enabling the animal to move from one place to another. 1: Arthropods’ muscles are connected to the exoskeleton. Go back to the Start menu Natural Science 2. Secondary Education

  7. UNIT3 The movements of animals The locomotor system in echinoderms • Their muscles are associated with a system of tubes and ampullae (sacs) full of water knows as the ambulacral system. Tube foot 1: The pressure on the ampullae pushes the tube feet out of the animal’s body. 2: The starfish moves. Go back to the Start menu Natural Science 2. Secondary Education

  8. UNIT3 The movements of animals The locomotor system in vertebrates • Their muscles are anchored to parts of the internal skeleton. 2: The limbs move, and so does the animal. 1: The muscles contract and pull the bones. Go back to the Start menu Natural Science 2. Secondary Education

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