What factors affect the speed and duration of muscle contractions?
Force and Velocity, Exercise, Smooth Muscle
- The # of muscle fibers stimulated (more more units stimulated=greater contraction)
- The size of the muscle fibers stimulated. Bulkier muscles=higher tension=greater force )
- Frequency of Stimulus (rapid stimulus=greater contraction)
- Degree of muscle stretch (optimal is 80-120%)
What factors influence the force of muscular contractions?
The peak force and power output of muscle depend on many factors. These include (1) fiber length and size: (2) architecture (such as angle and physical properties) and (3) fiber type: (4) number parallel cross-bridges: (5) force …
What affects muscle contraction?
Muscle contractions can be described using two variables: length (or tension). If the muscle tension changes, but the length of the muscle remains the same, a muscle contraction can be described as isometric. A muscle contraction, on the other hand, is described as isometric if the muscle tension changes but the muscle length remains constant throughout the contraction.
What is the main factor in determining how much or how long a muscle can contract?
There are three main factors that influence how strong your muscles perform: strength, power, and endurance. The maximum amount of force a muscle can exert is called strength. The power of muscles is the speed at which the muscles can perform this work and transfer energy.
How does calcium affect the process of muscle contraction?
Calcium binds with the troponin. This causes a change in the position of tropomyosin. Myosin then attaches to these actin sites for a contraction (5,6). Without calcium, blood wouldn’t clot.
Why is calcium necessary for muscle contraction quizlet?
Why calcium is necessary for muscle contraction? Calcium is required to separate the myosin and actin. Calcium is required to enable the muscle fibers to become depolarized. Calcium is required to activate troponin, so that tropomyosin may be moved to expose myosin binding sites on the actin filament.
How is troponin End. to muscle contraction?
Function. Troponin attaches to the protein tropomyosin. It lies in the groove between muscle tissue’s actin filaments. Tropomyosin is able to block the myosin crossbridge attachment site in a relaxed muscle and prevents contraction.
Which Troponin is cardiac specific?
Results. We found (1) that troponin I was a better cardiac marker for myocardial damage than CKMB; (2) that troponin T was a less sensitive and more specific cardiac marker for myocardial injuries; (3) …
What type of protein is troponin?
Troponins is a group protein found in the skeletal and cardiac muscle fibers. They regulate muscular contraction. To detect heart damage, troponin tests measure the amount of cardiac-specific troponin present in the blood. Troponin C, T and I are the three types of troponin protein.
Is troponin 0. 01 normal?
Based on the 99th percentile rule, troponin decision limits of several high-sensitivity cTn assays can be set as low as 0. 01 ng/mL.