Sept 15 - Animals Lecture #3

Perpendicular to animal vegetal axis it cleaves

This preview shows 4 out of 6 pages.

perpendicular to animal-vegetal axis, it cleaves oblique to this axis and typically produces a quartet of cells that come to lie not on top of each other but in furrows between the cells o Typical of molluscs, annelids, and other protostomes o Spirally cleaving eggs tend to pack their cells tightly together much like a cluster of soap bubbles rather than just lightly contacting each other Part 2 - Protozoa
Image of page 4

Subscribe to view the full document.

Introduction o Occurs wherever life exists o Highly adaptable o Require moisture o Sessle or free swimming 1. Protozoans defy tidy characterization - Diversity in form and function rivals almost all other animals combined 2. Despite apparent simplicity, protozoans are as complex as any metazoans i.e. a single cell capable of feeding/digesting, locomotion, “behaving” and reproducing possess organelles not general found in metazoan cells 3. Few other groups rival protozoans in economic importance primary production and in decomposition human/animal health (malaria/dysentery/sleeping sickness) Locomotion move chiefly by cilia and flagella and by pseudopodial movement Three mechanisms of locomotion in Protozoa (not mutually exclusive) 1. Ciliary motion a. Cilia : hair-like outgrowths from body/cell wall a.i. Fastest ciliates up to 720 cm/h a.ii. Propels water parallel to surface to which cilium is attached 2. Flagellar motion a. Flagella : whip-like outgrowths from body/cell wall a.i. Fastest flagellate up to 72 cm/h a.ii.
Image of page 5
Image of page 6
You've reached the end of this preview.

{[ 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