BIOL 111 Lecture Notes - Lecture 16: Moulting, Prothoracicotropic Hormone, Neurohormone

• School: McGill University
• Department: Biology (Sci)
• Course: BIOL 111
• Professor: Rajinder Dhindsa

Document Summary

Biol 111-lecture 16-arthropods (continue), echinoderms & chordates: moulting in arthropods, ptth (brain hormone (prothoracicotropic hormone), peptide) Stored and produced by the brain (neurohormone) Controls prothoracic gland activity: ecdysone (steroid) Negative feedback on ptth: body control systems (human, hypothalamus/posterior pituitary gland, neurohormone. Trigger increase of salt concentration in blood more concentrated urine. Milk release from mammary glands: anterior pituitary gland. *larvae bilaterally symmetrical *evolved from bilaterally symmetrical ancestor layers of skin & muscle: pentaradial (5-part) symmetry, (closed) water vascular system. -larvae are planktonic, ciliated arms: asexual reproduction. -can be used to escape predation & decrease chance of infection. -development of an unfertilized egg, e. g. sea urchin: diversity. -evert stomach, secrets enzymes, engulf partially digested food. -reduced endoskeleton: chordates, characteristics unique to chordates. Post-anal tail: characteristics common to chordates ventral heart reduced segmentation segmented musculature, myomeres , cephalochordates, e. g. lancelets, urochordates e. g. sea squirts.