What would be true of a muscle whose effort lever is shorter than its resistance lever
Added by Erica G.
Step 1
--- ** Show more…
Show all steps
Your feedback will help us improve your experience
Sri K and 90 other Biology educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
The force, speed, or direction of movement produced by contraction of a muscle can be modified by attaching the muscle to a lever. A lever is a rigid structure, like a bone, that moves on a fixed point called the fulcrum. The seesaw is a 1st class lever. In such a lever, the fulcrum lies between the effort (E) and the resistance (L). The body has few first-class levers. One example is the elbow joint. In a 1st class lever, the resistance is located between the effort and the fulcrum. A familiar example is a loaded wheelbarrow. The weight of the load is the resistance, and the upward lift on the handle is the force. Because in this arrangement the force is always farther from the fulcrum than the resistance is, a small force can balance a larger weight. The body has few second-class levers. In performing plantar flexion, the calf muscles use a second-class lever. First-class levers are the most common levers in the body. In this lever system, an effort is applied between the resistance and the fulcrum. The site at which a muscle begins is its origin, and the site at which it ends is its insertion. Each muscle contracts to produce a specific action or movement. In general, the origin remains stationary - attached to a bone or other structure that doesn't move - whereas the insertion moves.
Sri K.
Why would you expect the lever shown in the top image (below) to have a greater efficiency than the inclined plane shown in the bottom image (below)? The effort arm is shorter in case of the inclined plane. The resistance arm is shorter in case of the inclined plane. The area of contact is greater in case of the inclined plane.
Frank D.
Even though lifting something heavy with a lever sometimes seems easier, what compensates for the lower amount of force needed? Group of answer choices Shorter lever arm in in lower force side Longer lever arm in lower force side Longer lever arm in higher force side
Ankur S.
Recommended Textbooks
Biology for AP Courses
Objective Biology for NEET
Introduction to General, Organic and Biochemistry
Transcript
18,000,000+
Students on Numerade
Trusted by students at 8,000+ universities
Watch the video solution with this free unlock.
EMAIL
PASSWORD