Animal development: We're just tubes (video) | Khan Academy

Tubes of toy animals come with a variety of different plastic figurines and provide hours of fun!
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BioreclamationIVT offers a new line of peripheral blood mononuclear cells (PBMCs) derived from human and animal species - whole blood, CPT tubes, buffy coat and Leukomax™.
Funnel in some fantastic fun for your small animal with Petco’s selection of hamster tubes and tunnels.
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Fun-nel Tubes are the ideal way to expand your CritterTrail habitat. Easy to connect and pull apart so you can add space for more roaming area in minutes. The Bubble Wave tube design features a comfort grip that is safe for your pet's paws. Connector Rings snap on easily to ensure a safe and secure passageway. Easy to clean, tubes pull apart and snap back together for trouble-free cleaning. Buy any of our wide assortment of Fun-nel tubes and accessories to create your own unique habitat for your pet. Universally connectable and come in assorted colors. Requirements include animal, anesthetic agent, cotton, 25G needle, animal warming chamber and blood sample collection tubes.
Photo provided by FlickrRequirements include animal, anesthetic agent, cotton, capillary tube and blood sample collection tubes.
Photo provided by FlickrWild Life Animal Tubes
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The process that animals go through to turn a sperm cell and an egg cell into a multicellular organism is incredible. No, it's not just incredible, it's unbelievably, transcendentally, magnificent, man. Magnificent! Dude, the thing is, we're all just, like, tubes.Experiments on the entrainment of surface sediments around polychaete tubes at natural and manipulated densities were conducted in a recirculating seawater flume. Intact cores with either 0 or 8 Diopatra cuprea tubes per 0.01 m2 plus associated assemblages were collected in the field. Sediments which contained D. cuprea tubes had natural macrofaunal densities >5 x those of sediments without tubes. To distinguish between organism‐induced sediment effects and the hydrodynamic effects of tubes on the critical entrainment velocities of these sediments I used cores with eight tubes per 0.01 m2 (tubes and high macrofaunal density), similar cores with tubes removed (no tubes and high macrofaunal density), cores with eight tubes added (tubes and low macrofaunal density), and cores without tubes (no tubes and low macrofaunal density). Critical entrainment velocities for natural cohesive sediments in these treatments were 46% lower in the cores with high densities of macrofauna than in those with low densities. The implication is that biotically mediated sedimentological changes around D. cuprea tubes, rather than alterations of near‐bed flow by the tubes, are responsible for lowering erosion thresholds in this system.Hank discusses the process by which organisms grow and develop, maintaining that, in the end, we're all just tubes.

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Table of Contents
1) Zygote
2) Morula
3) Blastula
4) Radial Symmetry
5) Bilateral Symmetry
6) Gastrulation
7) Blastopore
8) Gastrula
9) Protostomes & Deuterostomes
10) Germ Layers
a) Diploblastic
b) Triploblastic
11) Biolography

References for this episode can be found in the Google document here:

animal development, biology, science, crashcourse, animal, classification, phylum, embryo, multi-cellular, sea sponge, symmetry, organs, cells, complexity, tube, life form, tissue, jellyfish, coral, sperm, egg, zygote, morula, blastula, mouth, anus, radial symmetry, bilateral symmetry, digestive tract, gastrulation, gastrula, protostome, deuterostome, chordate, vertebrate, ectoderm, endoderm, germ layer, mesoderm, ernst haeckel, recapitulation theory, ontogeny, phylogeny, evolution, embryology, developmental biology Support CrashCourse on Subbable: Requirements include animal, anesthetic agent, cotton, 25G needle, i.v. cannula, surgical blade, heparin (or any anticoagulant) and blood sample collection tubes.