What is the result of muscle contraction?

What is the result of muscle contraction?

During a concentric contraction, a muscle is stimulated to contract according to the sliding filament theory. This occurs throughout the length of the muscle, generating a force at the origin and insertion, causing the muscle to shorten and changing the angle of the joint.

What are the two basic requirements for muscle contraction?

In order for a skeletal muscle contraction to occur;

• There must be a neural stimulus.
• There must be calcium in the muscle cells.
• ATP must be available for energy.

What two factors influence the force of contraction of a whole muscle?

The amount of tension produced in a muscle contraction depends on two factors: the number of muscle fibers activated, and the frequency of neural stimulation to the muscle fibers.

Which of the following situations could contribute to prolonged muscle contraction?

Which of the following situations could contribute to prolonged muscle contraction? Active transport of calcium into the sarcoplasmic reticulum. It would cause muscles to stay contracted.

On what does the strength of contractions depend on explain?

Skeletal muscles contract with varying degrees of strength at different times. The strength of a muscle’s contraction depends on the amount of stimuli, the load placed on the muscle, and other factors.

Which of the following would not be a method used to regulate the strength of a muscle contraction?

Smooth muscle differs from skeletal muscle in a variety of ways, perhaps the most important being its ability to be contracted and controlled involuntarily. The nervous system can use smooth muscle to tightly regulate many of the body’s subsystems for life with no thought from the user.

How would muscle contractions be affected if ATP was completely depleted in a muscle fiber?

How would muscle contractions be affected if ATP was completely depleted in a muscle fiber? Because ATP is required for myosin to release from actin, muscles would remain rigidly contracted until more ATP was available for the myosin cross-bridge release. This is why dead vertebrates undergo rigor mortis.

Which of the following factors affect the strength of a muscle contraction?

Muscle strength is also a result of the combination of three factors: Physiological strength, which depends on factors such as muscle size, the cross-sectional area of the muscle and responses to training. Neurological strength, which looks at how weak or how strong the signal is that tells the muscle to contract.

What two factors influence the strength and duration of skeletal muscle contraction?

Factors that influence the velocity and duration of contraction are the muscle fiber type, load and recruitment.

Which of the following does not occur when a muscle fatigues?

Which of the following does not occur when a muscle fatigues? Its energy reserves are depleted.

What happens to the muscles during a contraction?

Muscle fiber generates tension through the action of actin and myosin cross-bridge cycling. While under tension, the muscle may lengthen, shorten, or remain the same. Although the term contraction implies shortening, when referring to the muscular system, it means muscle fibers generating tension with the help of motor neurons.

What does it mean when your muscles are weak?

Muscle weakness is a common complaint but the word weakness has a wide range of meanings, including tiredness, reduced power and failure to work at all. There is an even wider range of possible causes. What is muscle weakness? The term muscle weakness can be used to describe several different things.

What causes muscle weakness in people over 60?

Parkinson’s disease: this is a progressive disorder of both movement and mood, mainly affecting people aged over 60. In addition to muscle weakness, people with Parkinson’s disease notice tremor and stiffness. They often have difficulty in starting and stopping movements and they are often depressed.

What is the classification of voluntary muscle contractions?

Classification of voluntary muscular contractions Skeletal muscle contractions can be broadly separated into twitch and tetanic contractions. In a twitch contraction, a short burst of stimulation causes the muscle to contract, but the duration is so short that the muscle begins relaxing before reaching peak force.