{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Make-up Exam notes - General Info Biological 1st 3rd germ...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
General Info Body Wall/Support Locomotion Feeding/Digestion Circulation/Gas Exchange/Excretory Nervous System Reproduction Phylum Platyhelminthes Biological 1 st : 3 rd germ layer, chephalization, fw & terrestrial species, discrete organ systems, segmentation; 1 st appearance of excretory system Triploblastic; acoelomate; bilateral symmetry Incomplete gut (absent in cestoda) Protonephridia; no circulatory system Cephalized; anterior cereb. Ganglion, usually long. Nerve cords (ladder-like) Spiral cleavage; hermaphroditic Class Turbellaria Acoels very primitive; planuloid ancestor (externally ciliated, shape change, mouth appeared, bilateral streamlining Epidermis: epithelium w/ cilia and gland cells; basement membrane for struct. support (not in acoela) w/ smooth muscle cells inside; gland cells: produce mucus; rhabdoids: release causes mucus formation; rhabdites: rhabdoids produced by gland cells (defense); tubercles: defense Benthic: cilia- powered gliding w. mucus Forward movt: transverse furrows and ridges move as waves Swimming: muscular undulations Most carnivourous or scavengers; few herbivorous -locate by chemoreception; Mouth->pharynx-> intestine; Pharyngeal glands in pharynx prod mucus for feeding/swallowing; 3 Types: simple- short ciliated tube, feed by sweeping of cilia, eversible (nemerto, acoela); bulbous-muscular, protractile (rhabdocoels); plicate- ruffled in poly- and cylind. in triclads, protrudes by pharyngeal muscles, retractor pull back in; Diverticula; Protonephridia (except nemerto and acoela) for osmoregulation Most waste lost thru diffusion -Simple: netlike, concent in head -bilateral arrange., cerebral gang., long. Nerve cords connected by transverse commissures, Tactile receptors: around pharynx; Chemoreceptors: find food, on sides of head; Cilia: receive info from environ.; Rheoreceptors: orient to water movt, on side of head; Statocysts: near c.g; Photoreceptors: ocelli; Neurosecretory cells: regenerat., asex reprod. Asexual: transverse fission Sexual: hermaph Males: testes Female: entolecithal ova (nemerto, acoela, poly, macro), spiral; ectolecithal (rhabdocoela, tri) Sperm transfer thru cirrus by muscular action of cirrus
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Intestine-nutritive cells General Info Body Wall/Support Locomotion Feeding/Digestion Circulation/Gas Exchange/Excretory Nervous System Reproduction Phylum Platyhelminthes Biological 1 st : 3 rd germ layer, chephalization, fw & terrestrial species, discrete organ systems, segmentation; 1 st appearance of excretory system Triploblastic; acoelomate; bilateral symmetry Incomplete gut (absent in cestoda) Protonephridia; no circulatory system Cephalized; anterior cereb. Ganglion, usually long. Nerve cords (ladder-like) Spiral cleavage; hermaphroditic Tapeworms and Flukes Tapeworms: Most in Eucestoda 3 parts: Scolex, Neck, Strobila Cestodes lack scolex, proglottids, and digestive tract 3 types of suckers: -Bothria: long, longitudinal grooves on scoles, weak muscles,; single pair -Bothridia: 4 symm.
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern