vb.net qr code generator The Chordata in .NET

Generation Code 128 Code Set B in .NET The Chordata

CHAPTER 12 The Chordata
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throughout its lifetime, or does it replace the notochord with a full vertebral column after it has passed through the embryo stage
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THE SEA SQUIRTS AND LANCELETS: NO JOINTED BACKBONE
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Figure 122 reveals that two of the major groups of chordates keep a notochord in their back throughout their lives These two groups are called the Urochordates (YOUR-oh-kor-dates) and the Cephalochordates (SEF-uh-lowkor-dates)
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Output siphon Intake siphon
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Mouth
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Gill slits Nerve cord
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Adult stage
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Larva stage
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Notochord ( cord tail ) Tail (A) UROCHORDATES: Cord tails ; eg the sea squirt
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Mouth with tentacles
Gill slits Like a little lance Nerve cord Intestine buried in the sand
Notochord Anus
Tail
(B) CEPHALOCHORDATES: Cord-heads ; eg the lancelet
Fig 122 Sea squirts and lancelets: Chordates without spines
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The Urochordates are animals that literally have a cord (chord) within their tail (uro-) By this it is meant that these creatures have a swimming larval stage with a notochord in its tail section The main examples of Urochordates are the sea squirts Interestingly enough, the adult stage of the sea squirt has a body shaped like a U, and it remains anchored to a rock at the bottom of the sea At one end lies an intake siphon, which sucks in seawater and lters out plankton and other tiny creatures during feeding And at the other end lies an output siphon, which squirts or shoots out a jet of water whenever the animal is bothered by a predator The Cephalochordates are literally a group of cord-heads (cephalo-)! The implication of this odd name is displayed in Figure 122 (B) for the lancelets (LANS-lits) The lancelets are slender, sh-like marine animals that lie partially buried in the sand under shallow water Their thin, tapered body is pointed at both ends, making it look much like a small spear or little lance Because it has no skull, the lancelet doesn t have a brain, either! Thus, the notochord extends all the way up into its head, o cially making it a cord-head (Cephalochordate) The lancelet is a type of suspension feeder, meaning that it feeds on small particles suspended in seawater, which it draws into its mouth with the help of waving, hair-like tentacles (TEN-tuh-kuls) Both sea squirts and lancelets have notochords in their backs during at least part of their life cycles, but they are still o cially invertebrates Many biologists think that they are important evolutionary bridging species between the other invertebrates (which don t even have a notochord) and the true vertebrates (whose primitive notochord has been replaced by a bony vertebral column)
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THE VERTEBRATES CHORDATES WITH A JOINTED BACKBONE
In contrast to the Urochordates and Cephalochordates, the Vertebrata (verteh-BRA-tuh) or vertebrates are chordates with both a jointed (segmented) backbone and a brain case or cranium (KRAY-nee-um) (see Figure 123) You may recall ( 11) that the jointed backbones are technically called the vertebrae The cranium is just a formal name for the skull (crani) present (-um) at the top of the vertebral column Owing to their high degree of cephalization (concentration of sensory, motor, and other nerve functions within the head region), vertebrates have a brain in their cranium The vertebrates generally have a notochord only as part of their embryonic stage of development As their bodies mature, the notochord is replaced by a vertebral column (linked series of jointed vertebrae)
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CHAPTER 12 The Chordata
CRANIUM (BRAINCASE) containing brain
Vertebrae ( jointed backbones ) containing spinal cord
Heart and vessels (closed circulatory system)
Longitudinal axis ( lengthwise axle ) for body
Fig 123 Basic elements of the vertebrate body
The dorsal nerve cord, now protected by a vertebral column, is called the spinal cord The skull (brain case or cranium), vertebral column, and ribs make up what is called the axial (AX-ee-ul) skeleton The reason for this name is the pattern set by the bones or cartilage (KAR-tih-lj), commonly known as gristle, which house the brain and spinal cord This ordered bone/cartilage pattern forms a longitudinal (long-jih-TWO-duh-nal) axis, or lengthwise axle, around which the vertebrate body can turn or pivot Finally, vertebrates have a closed circulatory system The heart serves as a pump, which sends the blood coursing out through the entire body After the body tissues are supplied with oxygen, glucose, and other nutrients, the blood (now lled with tissue waste products) returns back to the heart through a closed loop of vessels
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