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Physiology

Skeletal Muscle Mechanics Model - Test 4

QuestionAnswer
What are the 3 elements of the skeletal muscle mechanics model? 1. Sarcomere 2. Tendons 3. Endomysium
True or False, When the parallel elastic element is shortening, the sarcomere is lengthening? False, Both have to be lengthening or shortening together
What are the 4 phases of muscle contraction? 1. Isometric Contraction 2. Isotonic contraction 3. Isotonic relaxation 4. Isometric Relaxation
During which phase of the muscle contration phase is there muscle tension development? Isometric Contraction Phase
During which phase of the muscle contration phase is there muscle contraction? Isotonic Contraction Phase
During which phase of the muscle contration phase is there muscle elongation? Isotonic Relaxation Phase
During which phase of the muscle contration phase does muscle tension dissipate? Isometric Relaxation Phase
What does isometric mean? Same length
How does a muscle contract but the length does not change? The contractile machinery contracts, but the series eleastic element stretches an equal amount
What does isotonic mean? Same tension
What is the movement phases of muscle contraction? Isotonic phases
What type of contraction actually lengthens muscle fibers? Eccentric Contraction
The velocity of muscle contraction is dependent upon what factor? The weight of the load
True or False, The greater the load, the faster the contraction. False. Heavy load = Slow Contraction
What is the Series Elastic element? Tendons
What is the Parallel Elastic element? Endomysium
What is the Contractile element? Sarcomere
During the Isometric Contraction Phase, what is happening to the Series Elastic element? Parallel Elastic element? Contractile element? Series Elastic element - Lengthens, Parallel Elastic element - Shortens, Contractile element - Shortens
During the Isotonic Contraction Phase, what is happening to the Series Elastic element? Parallel Elastic element? Contractile element? Series Elastic element - Stays the same length, Parallel Elastic element - Shortens, Contractile element - Shortens
During the Isotonic Relaxation Phase, what is happening to the Series Elastic element? Parallel Elastic element? Contractile element? Series Elastic element - Stays the same length, Parallel Elastic element - Lengthens, Contractile element - Lengthens
During the Isometric Relaxation Phase, what is happening to the Series Elastic element? Parallel Elastic element? Contractile element? Series Elastic element - Shortens, Parallel Elastic element - Lengthens, Contractile element - Lengthens
What phase of muscle contraction is happening when the sarcomeres are contracted and the whole muscle shortens? Isotonic Contraction
What is another name for the sarcomere length - tension relationship? Active Tension Curve
In the active tension curve, skeletal muscle diplays a bell shaped curve - Does cardiac muscle react in the same manner? No
When is any muscle capable of generating its greatest velocity? When there is no load
If a muscle is fully contracted, how much tension can be produced? None
Created by: Tri 2
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