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- Bones move when __________ muscles contract. a. cardiac b. skeletal c. smooth d. all of the aboveWhich of the following statements is correct about what happens during flexion? The angle between bones is increased. The angle between bones is decreased. The bone moves away from the body. The bone moves toward the center of the body.______ muscle pulls on bones and _______ muscle regulates the diameter of blood vessels. a. Skeletal / cardiac b. Smooth / cardiac c. Skeletal / smooth d. Smooth / skeletal
- A motor unit is _________. a. a muscle and the bone it moves b. two muscles that work in opposition c. the amount a muscle shortens during contraction d. a motor neuron and the muscle fibers it controlsA motor unit is _________. a. a muscle and the bone it moves b. two muscles that work in opposition c. the amount a muscle shortens during contraction d. a motor neuron and the muscle fibers it controlsBuilding Better Bones Tiffany, shown in FIGURE 35.22, was born with multiple fractures in her arms and legs. By age six, she had undergone surgery to correct more than 200 bone fractures. Her fragile, easily broken bones are symptoms of osteogenesis imperfecta (OI), a genetic disorder caused by a mutation in a gene for collagen. As bones develop, collagen forms a scaffold for deposition of mineralized bone tissue. The scaffold forms improperly in children with OI. FIGURE 35.22 also shows the results of a test of a new drug. Treated children, all less than two years old, were compared to similarly affected children of the same age who were not treated with the drug. Vertebral Treated area in cm2 Fractures child (Initial) (Final) per year 1 14.7 16.7 1 2 15.5 16.9 1 3 6.7 16.5 6 4 7.3 11.8 0 5 13.6 14.6 6 6 9.3 15.6 1 7 15.3 15.9 0 8 9.9 13.0 4 9 10.5 13.4 4 Mean 11.4 14.9 2.6 Vertebral Treated area in cm2 Fractures child (Initial) (Final) per year 1 18.2 13.7 4 2 16.5 12.9 7 3 16.4 11.3 8 4 13.5 7.7 5 5 16.2 16.1 8 6 18.9 17.0 6 Mean 16.6 13.1 6.3 FIGURE 35.22 Results of a clinical trial of a drug treatment for osteogenesis imperfecta (OI), which affects the child shown at right. Nine children with OI received the drug. Six others were untreated controls. Surface area of certain vertebrae was measured before and after treatment. Fractures occurring during the 12 months of the trial were also recorded. 3. How did the rate of fractures in the two groups compare?
- Building Better Bones Tiffany, shown in FIGURE 35.22, was born with multiple fractures in her arms and legs. By age six, she had undergone surgery to correct more than 200 bone fractures. Her fragile, easily broken bones are symptoms of osteogenesis imperfecta (OI), a genetic disorder caused by a mutation in a gene for collagen. As bones develop, collagen forms a scaffold for deposition of mineralized bone tissue. The scaffold forms improperly in children with OI. FIGURE 35.22 also shows the results of a test of a new drug. Treated children, all less than two years old, were compared to similarly affected children of the same age who were not treated with the drug. Vertebral Treated area in cm2 Fractures child (Initial) (Final) per year 1 14.7 16.7 1 2 15.5 16.9 1 3 6.7 16.5 6 4 7.3 11.8 0 5 13.6 14.6 6 6 9.3 15.6 1 7 15.3 15.9 0 8 9.9 13.0 4 9 10.5 13.4 4 Mean 11.4 14.9 2.6 Vertebral Treated area in cm2 Fractures child (Initial) (Final) per year 1 18.2 13.7 4 2 16.5 12.9 7 3 16.4 11.3 8 4 13.5 7.7 5 5 16.2 16.1 8 6 18.9 17.0 6 Mean 16.6 13.1 6.3 FIGURE 35.22 Results of a clinical trial of a drug treatment for osteogenesis imperfecta (OI), which affects the child shown at right. Nine children with OI received the drug. Six others were untreated controls. Surface area of certain vertebrae was measured before and after treatment. Fractures occurring during the 12 months of the trial were also recorded. 4. Do these results shown support the hypothesis that this drug, which slows bone breakdown, can increase bone growth and reduce fractures in young children with OI?Building Better Bones Tiffany, shown in FIGURE 35.22, was born with multiple fractures in her arms and legs. By age six, she had undergone surgery to correct more than 200 bone fractures. Her fragile, easily broken bones are symptoms of osteogenesis imperfecta (OI), a genetic disorder caused by a mutation in a gene for collagen. As bones develop, collagen forms a scaffold for deposition of mineralized bone tissue. The scaffold forms improperly in children with OI. FIGURE 35.22 also shows the results of a test of a new drug. Treated children, all less than two years old, were compared to similarly affected children of the same age who were not treated with the drug. Vertebral Treated area in cm2 Fractures child (Initial) (Final) per year 1 14.7 16.7 1 2 15.5 16.9 1 3 6.7 16.5 6 4 7.3 11.8 0 5 13.6 14.6 6 6 9.3 15.6 1 7 15.3 15.9 0 8 9.9 13.0 4 9 10.5 13.4 4 Mean 11.4 14.9 2.6 Vertebral Treated area in cm2 Fractures child (Initial) (Final) per year 1 18.2 13.7 4 2 16.5 12.9 7 3 16.4 11.3 8 4 13.5 7.7 5 5 16.2 16.1 8 6 18.9 17.0 6 Mean 16.6 13.1 6.3 FIGURE 35.22 Results of a clinical trial of a drug treatment for osteogenesis imperfecta (OI), which affects the child shown at right. Nine children with OI received the drug. Six others were untreated controls. Surface area of certain vertebrae was measured before and after treatment. Fractures occurring during the 12 months of the trial were also recorded. 2. How many of the untreated children showed an increase in vertebral area?Building Better Bones Tiffany, shown in FIGURE 35.22, was born with multiple fractures in her arms and legs. By age six, she had undergone surgery to correct more than 200 bone fractures. Her fragile, easily broken bones are symptoms of osteogenesis imperfecta (OI), a genetic disorder caused by a mutation in a gene for collagen. As bones develop, collagen forms a scaffold for deposition of mineralized bone tissue. The scaffold forms improperly in children with OI. FIGURE 35.22 also shows the results of a test of a new drug. Treated children, all less than two years old, were compared to similarly affected children of the same age who were not treated with the drug. Vertebral Treated area in cm2 Fractures child (Initial) (Final) per year 1 14.7 16.7 1 2 15.5 16.9 1 3 6.7 16.5 6 4 7.3 11.8 0 5 13.6 14.6 6 6 9.3 15.6 1 7 15.3 15.9 0 8 9.9 13.0 4 9 10.5 13.4 4 Mean 11.4 14.9 2.6 Vertebral Treated area in cm2 Fractures child (Initial) (Final) per year 1 18.2 13.7 4 2 16.5 12.9 7 3 16.4 11.3 8 4 13.5 7.7 5 5 16.2 16.1 8 6 18.9 17.0 6 Mean 16.6 13.1 6.3 FIGURE 35.22 Results of a clinical trial of a drug treatment for osteogenesis imperfecta (OI), which affects the child shown at right. Nine children with OI received the drug. Six others were untreated controls. Surface area of certain vertebrae was measured before and after treatment. Fractures occurring during the 12 months of the trial were also recorded. 1. An increase in vertebral area during the 12-month period of the study indicates bone growth. How many of the treated children showed such an increase?
- Which of the following is a function of the axial skeleton? allows for movement of the wrist and hand protects nerves and blood vessels at the elbow supports trunk of body allows for movements of the ankle and footStraps or dense, regular connective tissue _______. a. connect muscles to bones b. produce blood cells c. underlie the skin d. lack fibroblastsWatch this video (http://openstaxcollege.org/l/rheuarthritis) to learn about the symptoms and treatments for rheumatoid arthritis. Which system of the body malfunctions in rheumatoid arthritis and what does this cause?
