ANATOMY+PHYSIOLOGY
4th Edition
ISBN: 9781260265217
Author: McKinley
Publisher: RENT MCG
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Chapter 9.6, Problem 15WDYL
Summary Introduction
To analyze:
The difference between the effort arm and the resistance arm in a lever.
Introduction:
A lever is generally an elongated, rigid part that usually rotates along a fixed point which is referred to as the fulcrum. Levers can change the speed and distance of this movement, the direction of an applied force, and the force strength.
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What is an example of multiple lever types in the body during the same movement?
If your biceps brachii muscle attaches to your forearm 2 inches below your elbow, the distance from the elbow to the palm of your hand is 18 inches, and you lift a 20 pound weight, how much pull must your muscle exert to achieve elbow flexion? If your biceps brachii muscle attaches to your forearm 2 inches below your elbow, the distance from the elbow to the palm of your hand is 18 inches, and you lift a 20 pound weight, how much pull must your muscle exert to achieve elbow flexion?
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Define a lever.
Chapter 9 Solutions
ANATOMY+PHYSIOLOGY
Ch. 9.1 - What is the relationship between mobility and...Ch. 9.1 - Are all fibrous joints also synarthroses? Explain...Ch. 9.2 - Prob. 3WDYLCh. 9.2 - Prob. 4WDYLCh. 9.2 - Prob. 5WDYLCh. 9.3 - Prob. 6WDYLCh. 9.3 - Prob. 7WDYLCh. 9.4 - What are the basic characteristics of all types of...Ch. 9.4 - Prob. 9WDYLCh. 9.4 - Prob. 10WDYL
Ch. 9.5 - Prob. 11WDYLCh. 9.5 - Prob. 12WDYLCh. 9.5 - Prob. 13WDYLCh. 9.5 - Prob. 14WDYLCh. 9.6 - Prob. 15WDYLCh. 9.6 - Prob. 16WDYLCh. 9.7 - Prob. 17WDYLCh. 9.7 - Prob. 18WDYLCh. 9.7 - Prob. 19WDYLCh. 9.7 - How do the glenohumeral and hip joints compare...Ch. 9.7 - What are the functions of each of the...Ch. 9.7 - Prob. 22WDYLCh. 9.8 - Prob. 23WDYLCh. 9 - _____ 1. The greatest range of mobility of any...Ch. 9 - _____ 2. A movement of the foot that turns the...Ch. 9 - _____ 3. A _______ is formed when two bones...Ch. 9 - Prob. 4DYKBCh. 9 - Prob. 5DYKBCh. 9 - Prob. 6DYKBCh. 9 - Prob. 7DYKBCh. 9 - Prob. 8DYKBCh. 9 - Prob. 9DYKBCh. 9 - Prob. 10DYKBCh. 9 - Prob. 11DYKBCh. 9 - Prob. 12DYKBCh. 9 - Prob. 13DYKBCh. 9 - How do a hinge joint and a pivot joint compare...Ch. 9 - Prob. 15DYKBCh. 9 - Prob. 16DYKBCh. 9 - Most ankle sprains are overinversion injuries....Ch. 9 - What are the main supporting ligaments of the...Ch. 9 - Prob. 19DYKBCh. 9 - What are the similarities and differences between...Ch. 9 - Prob. 1CALCh. 9 - Prob. 2CALCh. 9 - Prob. 3CALCh. 9 - Prob. 4CALCh. 9 - Prob. 5CALCh. 9 - During soccer practice, Erin tripped over the...Ch. 9 - Prob. 2CSLCh. 9 - Jackie visits her physician because she is...
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- How does speed of muscle action affect the following relationships; force-velocity and force-power?arrow_forwardCompare and contrast first-, second-, and third-class leversarrow_forwardWhy can you lift a larger load when your elbow is slightly flexed and your biceps muscle is at an intermediate length than you can when your elbow is fully extended?arrow_forward
- Give a part of the body that uses the 2nd class lever system and; Explain how does the type of the lever system employed by the muscle influence the force it can generate and the load it can overcome?arrow_forwardWhat are two factors which allow the gastrocnemius and soleus muscles to generate greater plantar flexion torque than all the other muscles capable of plantarflexion?arrow_forwardWhen using muscles how do you generate more tension when picking up a heavier object than you do when picking up a pencil with the same muscles?arrow_forward
- What effect does the amount of trunk flexion and barbell placement have on the knee and hip muscles throughout the squat?arrow_forwardThree orders of levers are recognized: I. Fulcrum (pivot) between power and weight. II. Weight between power and fulcrum. III. Power between fulcrum and weight. What order of lever is involved in the action of the gastrocnemius muscle of the frog? Of man? Of the triceps in the fore limb? Of the biceps in the fore limb?arrow_forwardExplain the reason for holding the shopping bags towards the elbow leads to less muscle effort.arrow_forward
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