Lab 7 student

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Lab 7 student

Lab 7 student Hirudinea — leeches Hirudo medicinalis, Phylum Nematoda: Polychaete characteristics include a well-developed head and lateral appendages called parapodia, which are found on each segment.

Parapodia are used for both creeping and swimming. They can also take part in gas exchange, which is possible because parapodia contain a large number of respiratory capillaries.

Lab 7 student

In some forms fanwormsthe parapodia have been modified into large, feathery gills. In terms of nutrition, many polychaetes are carnivorous, seizing prey in chitinous jaws or teeth that are everted rapidly from a muscular pharynx. Some sedentary forms are particle feeders that use ciliary currents and mucus to trap organic food molecules, plankton, etc.

Examples of polychaete worms include: Nereis virens the clamwormAmphitrite the spaghetti wormGlycera the beak throwerChaetopterus the parchment wormAphrodita the sea mouse and fan worms also called feather duster worms or Christmas tree worms Nereis virens Nereis virens is a common polychaete inhabitant of shallow waters along the Atlantic coast of North America.

Hiding by day in burrows in sand or mud bottoms, the worms come out at night to search for food, which is grabbed with powerful jaws on a muscular eversible pharynx. Amphitrite Amphitrite is a genus marine polychaete worm that lives in the mucus tubes, which become thickly covered in fine sand and broken shell material.

They are sedentary and feed by waving the tentacles out of the tube into the seawater. These tentacles which are the most visible parts of the animal are reminiscent of spaghetti, giving them their common name spaghetti worms. The remainder of Lab 7 student animal remains in a semi-permanent burrow or tube constructed in soft substrates.

The tentacles are used to capture fine organic debris detritus and small organisms, which are then transported to the mouth by fine cilia. Glycera This marine polychaete is a voracious predator that remains hidden in an elaborate gallery system constructed in a muddy bottom.

When a suitable prey approaches the entrance to the gallery, the beak thrower explosively everts its pharynx to nearly one-fifth its body length and seizes it with four jaws that open at the tip.

The prey is then subdued with poison injected through ducts in its jaws. Chaetopterus This unique polychaete lives in mud flats in a leathery, open-ended U-shaped tube. Its common name comes from the parchment-like appearance of the tubes the worm lives in.

Modified parapodia near the middle of the body form fans that move water through the tube from end to end. Food particles carried by these currents are entangled in a sheet of mucus and then carried up a ciliated groove to the mouth.

Aphrodita This strange looking polychaete has numerous felt like setae on the dorsal surface and parapodia on the ventral surface that allow it to crawl across the substrate. These organisms may grow up to 20 cm and are active carnivores that feed chiefly on other polychaetes, including Nereis, which may be up to three times the length of the sea mouse.

The setae on the dorsal surface are iridescent and have a red sheen that may warn off predators. Dorsal surface This image of a sea mouse show the brilliantly colored setae that emerge from its scaled back. These setae are made of millions of submicroscopic crystals that reflect and filter the faint light of the ocean depths.

Ventral surface This image shows the ventral surface of a sea mouse with its numerous parapodia that permit it to crawl over the substrate in search of prey.

Fan worms These colorful polychaetes sometimes called feather duster worms or Christmas tree worms live in tubes constructed of sand grains embedded in mucus. Note the feather-like radioles tentacles that bear numerous branches lined with cilia. When threatened, a worm can rapidly withdraw these radioles into the tube, which is then sealed with an protective plug called an operculum.

Earthworms lack parapodia, are poorly cephalized and in general, are less diverse than polychaetes.

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Whether crawling on the surface or burrowing through soil, earthworms move by means of peristaltic contractions. Circular and longitudinal muscles are used alternately to extend and thicken each segment, while four pairs of setae on each segment are used to anchor parts of the body to prevent slipping.

In terms of reproduction, oligochaetes are monoecious but practice cross fertilization, and development is direct. Freshwater forms Although most oligochaetes are terrestrial, some live in freshwater. Usually smaller than earthworms many are microscopicfreshwater forms are normally found on the bottom or burrowed into mud where they feed on algae and detritus.

Note the chitinous setae projecting from the sides of the worm in the image above. An important group of freshwater oligochaetes are tubificid worms that live within tubes they secrete.

The blood of such species contains very high concentrations of hemoglobin, which allows them to exist in oxygen-poor waters such as sewage outflows and settling tanks.

As such, tubificids serve as important indicators of water quality. Reproduction During the reproduction, two earthworms come together from opposite directions in a way so that their clitella are in contact.

The clitellum, a saddle-like structure where fertilization actually takes place, is located about one-third way down the worm's body.Watch Busty brunette chem student Kiera King fucks her lab partner on timberdesignmag.com, the best hardcore porn site.

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AP Biology Lab Manual

Laboratory Manual Student Edition. Hands-On Learning: Laboratory Manual, SE/TE Forensics Laboratory Manual, SE/TE CBL Laboratory Manual, SE/TE • Pre-Lab The questions in this section check your knowledge of important concepts needed to complete the activity successfully. STATISTICS – LAB #7.

Statistical Concepts Confidence Intervals Hypothesis Testing. Calculating Confidence Intervals for one Variable Open the class survey results that . Online homework and grading tools for instructors and students that reinforce student learning through practice and instant feedback.

ECE PhD student Walt Woods and undergrad Jack Chen presented their work on “Explaining the Conclusions of Neural Networks” at the Early Detection of Cancer Conference. • Students will record data and fill in lab sheets on day 1 and day 2. • Student will complete a flow chart to show their testing data from a computer simulation.

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