Internal Anatomy (Sept. 17)

Internal Anatomy (Sept. 17) - Internal Anatomy Grasshopper...

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Internal Anatomy Grasshopper Internal Systems Respiratory o Goal: carry oxygen to cells and CO2 from tissues. o Spiracles: small openings on exoskeleton that allow air to enter. o Tracheae: tubes connecting spiracles in a network to all parts of body. o Tracheoles: terminal end that are principal sites of gas exchange. Circulatory o Goal: transport nutrients, hormones, and waste products and assist in immune system. o Haemocoel: body cavity used in the “open” circulatory system o Dorsal heart: contains intake valves called ostia and pumps haemolymph to head via the aorta o Most insects do not carry oxygen in haemolymph using hemoglobin (like mammals do). Accordingly, most insect haemolymph is not red. Exception: Chironomids have hemoglobin to reserve oxygen during anoxia. Digestive o Goal: responsible to break down food (carbs, proteins, fats) and excretion of waste products Foregut: ingesting food and initial digestion Mouth, pharynx, esophagus, crop, proventriculus
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