Name Date Class Real-World Biology: Real-World BR 32 Analysis Biomechanics Betha
ID: 265933 • Letter: N
Question
Name Date Class Real-World Biology: Real-World BR 32 Analysis Biomechanics Bethany Hamilton is a courageous teenage girl who is a competitive surfer. When she was 13 years old, Bethany lost her left arm in a attack near her home in Hawaii. Thrce wceks later, she was back in the water and then returned to competitive surfing and other sports with her one good arm. A myoelectric arm was developed for Bethany. Prosthetic devices, such as a myoelectric arm, are possible because, on a mechani cal level, the skeleton is a system of bony levers. In the body, the levers of bone are activated by muscles that produce movement. These principles of biomechanics are applied to the design of prosthetic arms and legs. Fukrurn First-Class Lever; Fulrum is between load and effort Levers form one of the most important groups of simple machines. At its simplest, a lever is a rigid bar that can turn freely around a fixed point, known as a fulcrum. Figure 1 illustrates the three different classes of levers. L is the load that is lifted, and E is the effort force used to lift the load. Fulaum Second-Class Lever: Load is between fulcrum and effort. Analyze and Conclude Respond to each question and statement 1. Identify Adenosine triphosphate (ATP) provides energy to move bones in the human hand. What is the source of the energy needed to move bones in the myoelectric hand? Third-Class Lever: Effort is between load and fulcrum. 2. Apply For each boneimuscle system in Figure 2, indicate which class Figure class Figure 1 of lever is illustrated and label the fulcrum, effort force, and load. C. 2 Quadriceps muscle pulls. b. Soleus muscle Hand pushes on table. Trceps muscle pul. S. Body is raised on toes G Leg kicks ball. Figure 2 b. Class of lever a. CHAPTER 32 Integumentary, Skeletal, and Muscular Systems 9 Unit 9Explanation / Answer
Ans-1 As the source of the energy in the hands is ATP in similar manner the source of energy for the myoelectric hand is externally provided electrical signal with the help of rechargable batteries. These batteries may be removeable or non removeable.
Ans-2 in figure A the lever working is lever type 1 because in this leg act as falciparum and the anterior part of leg acts as load and the muscle act as effort.
In figure B the elbow acts as falciparum the wrist act as the lever and the triceps act as effort so is an example of lever type 3.
In figure C the leg acts as falciparum and and the muscle acts as lever and the pulling of upper body act as effort so is an example of type 2 lever.
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