Berkeley ESPM 40 - Lecture 3 - Internal Anatomy (3 pages)

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Lecture 3 - Internal Anatomy



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Lecture 3 - Internal Anatomy

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Pages:
3
School:
University of California, Berkeley
Course:
Espm 40 - Insects and Human Society

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ESPM 40 Insects and Human Society 10 Sept 14 WHAT ARE INSECTS THE INSIDE Reading assignment See bcourses for web links The link to a web site covering Key questions 1 Compared to humans how are insects are inside out upside down filled with air tubes and fluid 2 What are advantages and limitations to the tracheal system of respiration in insects 3 Why don t insects need to transport oxygen in their hemolymph 4 How can females of some species continue to fertilize eggs for many days or even years after mating Know terms and phrases underlined below I General internal organization Key differences compared to vertebrates A Skeleton is on the outside inside out B Ventral nerve cord C Tracheal system respiration D Circulatory system for hemolymph blood is an open circulatory system II Prior to Marcello Malpighi 1669 it was generally thought insects did not have internal organs III Alimentary tract gut A Organization 1 tube open at both ends enter at one end exits the other just like us 2 compartmentalized for ingestion digestion excretion B Foregut an invagination of the outside of the insect 1 lined with water proof cuticle transports and crushes food some digestive enzymes or feeding aids e g local anesthetics for blood feeders may be added in saliva 2 may store or crush food 3 know oesophagus crop and proventriculus C Midgut main digestive and absorptive portion of gut D Malpighian tubules excretory organ analogous to mammalian kidney 1 maintains ion salts balance of hemolymph 2 eliminates breakdown products waste the most toxic of which are usually nitrogen 3 empties into beginning of the hindgut E Hindgut storage passage of digested food and excrement some absorption especially water IV Nervous system upside down A Organization series of segmental ganglia 1 ganglia interconnect nerves to sensory organs and to muscles 2 insect brain consists of several groups of large ganglia in the head B Basic neural circuitry similar to other animals including vertebrates 1



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