BIOLOGY
12th Edition
ISBN: 9781260169614
Author: Raven
Publisher: RENT MCG
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Chapter 45, Problem 2U
Worms use a hydrostatic skeleton to generate movement. How do they do this?
a. Their bones are filled with water, which provides the weight of the skeleton.
b. The change in body structure is caused by contraction of muscles compressing the watery body fluid.
c. The muscles contain water vacuoles, which, when filled, provide a rigid internal structure.
d. The term hydrostatic simply refers to moist environment. They generate movement just as arthropods do.
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Worms use a hydrostatic skeleton to generate movement. How do they do this?
a. Their bones are filled with water, which provides the weight of the skeleton.
b. The change in body structure is caused by contraction of muscles compressing the watery body fluid.
c. The muscles contain water vacuoles, which, when filled, provide a rigid internal structure.
d. The term hydrostatic simply refers to moist environment. They generate movement just as arthropods do.
Which statement best describes how an earthworm moves?
a
Contracting setae while relaxing longitudinal and circular muscles
b
Contracting longitudinal muscles in anterior sections forces fluid across the septum and into segments in the posterior sections
c
Contracting longitudinal muscles which puts pressure on the hydrostatic skeleton and causes it constrict and elongate
d
Simultaneous contraction of longitudinal and circular muscles within a segment
e
Alternating contraction of longitudinal muscle in a posterior segment with contraction of circular muscles in the neighboring anterior segment
What function do the webbed feet of a duck and the hooves of a horse have in common?
A. The both help the animals blend in with their environment.
B. They both help the animals to move in their environment.
C. The both help the animals burrow for shelter.
D. They both help to keep the animals warm.
Chapter 45 Solutions
BIOLOGY
Ch. 45.1 - Compare hydrostatic skeletons, exoskeletons, and...Ch. 45.1 - Explain how animals with hydrostatic skeletons...Ch. 45.2 - Prob. 1LOCh. 45.2 - Prob. 2LOCh. 45.2 - Prob. 3LOCh. 45.3 - Prob. 1LOCh. 45.4 - Prob. 1LOCh. 45.4 - Prob. 2LOCh. 45.4 - Prob. 3LOCh. 45.5 - Prob. 1LO
Ch. 45.5 - Describe how friction and gravity affect...Ch. 45.5 - Prob. 3LOCh. 45 - Prob. 1IQCh. 45 - Exoskeletons and endoskeletons differ in that a....Ch. 45 - Worms use a hydrostatic skeleton to generate...Ch. 45 - Bone develops by one of two mechanisms depending...Ch. 45 - Which of the following statements best describes...Ch. 45 - Motor neurons stimulate muscle contraction via the...Ch. 45 - Prob. 6UCh. 45 - If you wanted to study the use of ATP during a...Ch. 45 - Place the following events in the correct order....Ch. 45 - You take X-rays of two individuals. Ray has been a...Ch. 45 - You have identified a calcium storage disease in...Ch. 45 - How do the muscles move your hand through space?...Ch. 45 - How can osteocytes remain alive within bone? a....Ch. 45 - Swimming underwater using forelimbs for propulsion...Ch. 45 - If a drug inhibits the release of ACh, what will...Ch. 45 - Prob. 1SCh. 45 - Prob. 2SCh. 45 - The nerve gas methylphosphonofluoridic acid...Ch. 45 - If natural selection favors the evolution of wings...
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- give a definition of body segmentation, and explain how animals became better adapted to movement as they evolved segmentsarrow_forwardWhat is the difference between saying that a duck has webbed feet because it needs them to swim and saying that a duck is able to swim because it has webbed feet?arrow_forwardgive examples of animals with hydrostatic skeleton that are soon changed to exoskeleton or endoskeleton when they growarrow_forward
- Agnathans (Jawless FIsh) Look at the image that is attached to this question to answer the questions I have How well developed is the skeleton. Is the notochord still evident? Is the skin smooth or rough? Can you see well-developed fins? What about the eyes?arrow_forwardanthropology question A femur exhibits a clean, round entrance wound to the popliteal surface that measures approximately one-quarter of an inch; however, there is no exit wound. what can be said of the power, size, and placement of the weapon causing wound? if there had been an exit wound, where would it have been located and what type of fracture lines would have radiated from it?arrow_forwardLook at the picture. Which sentence about the structure pictured is correct? A. It brings oxygen into the animal's body. B. It pumps blood to all parts of the body. C. It provides a rigid support system. D. It keeps the animal in balance as it moves.arrow_forward
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