Lesson 11 - Grasshopper Ppt.ppt 655x5o

Grasshopper Organ Systems

What is a grasshopper? A grasshopper is an arthropod. It has  ted appendages  A segmented body  An exoskeleton

Skeleton  The grasshopper has a hard exoskeleton. That means its skeleton is located on the outside of its body, not internally like ours. This skeleton is made of chitin, a carbohydrate.

The mouth  The mouthparts are a set of movable jaws that let the grasshopper bite and tear its food.  Can tear and chew larger food until particles are small enough to ingest.

The mouth  Mandibles - two heavy blackish jaws with teeth along the inner margin. The mandibles move up and down.  Maxillae - two smaller jaws that move side to side  Labium - the lower lip  Palp - maxillary and labial palps are sensory appendages

Digestive System Video: https://youtu.be/XloEMjEKGQU

Digestive System  These are the parts of the digestive system :     

Mouth Esophagus Crop Stomach Intestine

 Chewed food is stored in the crop, digested in the stomach, and absorbed in the intestine.

Respiratory System Video: https://youtu.be/quwhcgkVO3c

Respiratory System  Small holes on the side of the body are called spiracles, each hole leads to a large tube called a trachea. The large tubes divide into small tubes that branch out to all the cells of the body. This system of tubes carries oxygen to the cells and takes away the carbon dioxide.  Air sacs attached to the tracheae are inflated or deflated by pumping motions of the insect’s body.

Respiratory System  The grasshopper does not have a lung. How then does it breathe?  Air enters the spiracles and as the abdomen expands and contracts, fresh air moves in and used air moves out.  The air enters the cells directly and is not transferred to the blood- that’s why their blood is yellow, not red- it contains no hemoglobin!

Respiratory System  Oxygen diffuses from the moist lining of the sacs into the body fluids surrounding the sacs.  Waste gas, Carbon dioxide, diffuses from the fluids into the air sacs, and is exhaled into the external environment through the spiracles.

Circulatory System Video: https://youtu.be/0eh17UjJoag

Circulatory System The grasshopper’s circulatory system is open- that means that it does have a “heart”, but the heart is more of a muscular tube that collects the blood and forces it to the front of the body. The blood freely flows throughout the grasshopper

Circulatory System Open circulatory system: circuit of tubes and vessels is incomplete. Circulating fluid can pour out of the tubes into the body cavity. This forms pools of blood that bathe the animal’s tissues and deliver nutrients and oxygen to its cells.

Circulatory System Pumping pressure eventually brings the pooled blood back into tubes that return it to the heart. In grasshoppers, the large 7-chambered heart pumps in blood into large cavities among the body tissues.

Cool fact…  The grasshopper does not use its brain to walk or jump! It does that without a brain.  The brain is used to control the mouth and to send sensory information to the rest of the body.