Invertebrates Part 1 Animal Characteristics Sponges & Cnidarians (Section 24.3) Biology 102B Characteristics of Animals 1. Multicellular, eukaryotes 2. Heterotrophs 3. Cells w/out cell walls, many have specialized functions 4. Usually have a method of movement
5. Most reproduce sexually 6. Require oxygen Describe the Body Plans of Animals 1. Symmetry: balance in body proportions a. Asymmetrical:have irregularly shaped bodies, no symmetry b. Radial symmetry: can be divided along any plane to produce 2 halves which look alike
c. Bilateral: can be divided only one way to Symmetry Radial produce mirror image Bilateral halves Posterior end Dorsal Ventral Planes of
symmetry Anterior end Planes of Symmetr y 2. Body arrangements: a. anterior: head region b. posterior: tail region c. dorsal: back or top
d. ventral: abdomen or bottom Sponges: Phylum Porifera (pore bearer) Simplest of all animals Assymetrical animals that live in shallow waters Sessile filter-feeders whose bodies have many pores Obtain oxygen by filtering water
No nervous system or organ system Sponge Reproduction Reproduce Asexually: Fragments break off and grow into new individuals, can grow back missing parts (regeneration) Buds form from sides of parent sponge Reproduce sexually:
Hermaphrodites: produce both eggs and sperm Gametes are released into water (external fertilization) Sponge Body Structures Osculum: large opening at the top of the sponge Pore cells: openings to bring in water Collar cells (choanocytes): line interior, have flagella to help filter water Spicules:
hard, supportive structures found in body of sponge Figure 268 The Anatomy of a Sponge Section 26-2 Osculum Central cavity Pores
Marine animals with radial symmetry Have tentacles Predators: capture and poison prey with stinging cells on tentacles called NEMATOCYSTS Oxygen diffuses into body from water Cnidarian Reproduction Asexually reproduce by
budding Sexually reproduce in medusa form only, sperm and eggs are released into water Thousands of gametes are released at a time In the box on your notes answer the following: Explain why sponges and
cnidarians release so many gametes into the water Cnidarians: Body Forms Polyp: body with tentacles hanging upward Ex: hydra, sea anemone Medusa: body with
tentacles hanging downward Ex: jellyfish Structures: One body opening (mouth) for food to enter and wastes to exit Gastrovascular cavity: interior cavity where food is digested & nutrients are circulated around the body
Label the hydra on your notes! Nerve net: net of nerves that allow impulses to travel around the body, senses the environment
Demand Analysis. Demand: Describes the quantity of a good buyers wish to purchase at every possible price, at a particular moment in time or a relationship between price and quantity demanded in a given time period, ceteris paribus.. Market demand:...
التركيب الجزيئي لمركز نيوكب The Molecular Biology of Nieuwkoop center التمايز الخلوي ودور المنظمات الجنينية 1-عند حقن mRNA للنوقين في الفلجات البطنية الخضرية لجنين الضفدعة فإنة يكون مركز نيوكب ويحفز تكوين ...
WBS * Marc Conrad University of Bedfordshire * The Dictionary of the WBS A WBS dictionary is a companion document to the WBS that describes each WBS element. For each WBS element, the WBS dictionary includes a statement of work,...
Associated with over half the total of maternal deaths in the UK (RCM, 2010) Confidential Enquiries into Maternal and Child Health (Lewis & Drife, 2004, Lewis, 2007, Lewis 2011) 2000-2002 CEMACH report 30% maternal deaths were in obese women. 2003-2005...
TexPoint fonts used in EMF. Read the TexPoint manual before you delete this box.: AAAAAAAAAAAA * Sample Mean r.v. X: E[X]=µ, Var[X]=¾2 Q: how to use simulation to derive? Simulate X repeatedly X1, , Xn are i.i.d., =statistic X Sample...
I will try to maintain the appropriate links in my webpage and citations in my Lecture Notes. Required books are available at the CSTR Homework/written report: all the homework assignments must be collected in a single tex/pdf files organized as...
(a) New insights in the discussion: Variations in paternal involvement. in the transition to fatherhood (Habib, 2012) as a means of understanding the emergence of a new identity status, that is, becoming a father (identity theory).
Ready to download the document? Go ahead and hit continue!