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The Grasshopper: an insect

The Grasshopper: an insect. Being an insect means it has 6 legs. It is also called an ARTHROPOD, which literally means, jointed feet. Nutrition. A 1 way digestive tract Specialized mouthparts for cutting and tearing food

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The Grasshopper: an insect

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  1. The Grasshopper: an insect Being an insect means it has 6 legs. It is also called an ARTHROPOD, which literally means, jointed feet

  2. Nutrition • A 1 way digestive tract • Specialized mouthparts for cutting and tearing food • Both the salivary glands and gastric caeca secrete hydrolytic enzymes. What is their purpose? - to chemically digest (hydrolyize) the food

  3. The Grasshopper’s Digestive Tract Stomach Gizzard Intestines Crop Anus Esophagus Gastric Caece Salivary Glands Rectum Mandible Pharynx

  4. Transport The grasshopper has: • An internal OPEN CIRCULATORY SYSTEM: No network of vessels • A Tubular heart which pumps blood into the AORTA: A large aorta blood vessel which squirts blood into the… • SINUSES: large cavities where blood bathes cells. Blood re-enters the Aorta through a series ofvalves.

  5. Circulatory System The blood of a grasshopper does NOT contain hemoglobin! So it can’t carry oxygen. The grasshopper is basically hollow in side, with blood squirting everywhere, like a lemonade machine Tubular Heart Aorta Sinuses

  6. RESPIRATION • Since respiratory gases are not carried in the blood, they are carried by a system of tracheal tubes or tracheae. These open to the air through small openings called spiracles. These tubes lead to the moist membranes of the body cells • Air sacs pump air through the tracheae • Other than the spiracles, the grasshoppers body is dry and impermeable to liquids and gases. Is this beneficial considering their environment?

  7. Respiration Air sacs Trachea Spiracles

  8. Excretion • Carbon dioxide diffuses from body cells into body fluids, into tracheal tubes, out through the spiracles. • Water, mineral salts, URIC ACID CRYSTALS (its nitrogenous waste) accumulate in the malpighian tubules: the Excretory organs of the grasshopper • These wastes pass into the intestine, where most of the water is reabsorbed • Minerals, Uric acid crystals leave body with the digestive wastes.

  9. More Excretion • Uric acid crystals aren’t soluble in water • Malpighian tubules main function, then is to reabsorb water and excrete solid waste. Stomach Rectum Malpighian Tubules

  10. REGULATION The grasshopper has: • A central nervous system with peripheral nerves branching off • Highly developed sense receptors (antenna) Ganglion Brain Nerve Cord

  11. LOCOMOTION • Moves with the interaction of muscles with the EXOSKELETON (skeleton on the outside) • Exoskeleton made of CHITIN, a polysaccharide. • It is jointed to permit movement • It has 3 pairs of legs, 2 pairs of wings Jumpin Legs Outer Wings Walking legs

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