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Chapter 12: Problem 6

In an isotonic contraction, a) Muscle length shortens. b) Muscle tension exceeds the force of the load. c) The load is moved. d) Both a and \(c\). e) All of the above.

Short Answer

Expert verified
e) All of the above.

Step by step solution

01

Define Isotonic Contraction

An isotonic contraction is a type of muscle contraction where the muscle changes length while the tension remains constant. This type of contraction occurs when the muscle's force is sufficient to move a load.
02

Analyze Each Option

Let's evaluate each option in the context of isotonic contraction: - (a) Muscle length shortens: In isotonic contractions, muscle length changes, typically by shortening. - (b) Muscle tension exceeds the force of the load: For the load to move, the muscle's tension must be greater than the load's force. - (c) The load is moved: This is characteristic of isotonic contractions, as the purpose is to move the load. - (d) Both a and c: If both a) and c) are correct, then d) would also be correct. - (e) All of the above: If a), b), and c) are correct, then e) is correct.
03

Conclusion

Since option a), option b), and option c) accurately describe aspects of isotonic contraction, option e) 'All of the above' must be the most correct choice.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Isotonic Contraction
During an isotonic contraction, a muscle changes its length while continuously maintaining a consistent level of tension. This process is crucial for various body movements, be it lifting weights, walking, or even performing everyday tasks like picking up a coffee cup. Isotonic contractions are divided into two types:
  • Concentric Contraction: This occurs when the muscle shortens as it exerts a force. For instance, lifting a book involves the biceps contracting concentrically.
  • Eccentric Contraction: In this scenario, the muscle lengthens while still applying force, such as when gently lowering the book back to the table.
The key idea here is that despite changes in muscle length, tension remains constant as the load is moved.
Muscle Tension
Muscle tension refers to the force exerted by the muscle when it contracts. In isotonic contractions, it is essential that muscle tension exceeds the force of the load to initiate movement. Consider a scenario where you lift a barbell. Here, your muscles need to generate enough tension to lift it against the force of gravity.
When analyzing muscle tension, there are a few critical components:
  • Active Tension: This is the force produced by the contractile elements within the muscle fibers themselves.
  • Passive Tension: Generated when the muscle is stretched, originating from non-contractile elements like tendons and other connective tissues.
Together, these components help ensure effective movement during isotonic contractions.
Muscle Length
Muscle length changes are central to isotonic contractions. This change in length is what enables movement. As muscles contract, they shorten, pulling on bones or other structures to create motion. This shortening of muscle fibers occurs because of a sliding filament mechanism.
Here's how this works:
  • The filaments known as actin and myosin slide past one another in the muscle cells.
  • This sliding action decreases the distance between lines called Z-discs, effectively shortening muscle fibers.
Keep in mind that muscle shortening is not the only factor鈥攄uring eccentric contractions, muscles lengthen but still produce force, making isotonic contractions versatile in movement generation.
Load Movement
For load movement to occur in isotonic contractions, the muscle tension must outweigh the load. Essentially, it's like a game of tug-of-war where the muscle has to "win" by lifting or moving the load. When this balance tips in favor of the muscle, movement happens.
Factors influencing load movement include:
  • The intensity of muscle contraction: Stronger contractions can move heavier loads.
  • Muscle fatigue: Tired muscles may reduce the ability to move loads efficiently.
  • Angle of the muscle pull: Optimal angles facilitate more effective force application.
Thus, isotonic contractions are finely tuned actions, perfectly balancing force and movement.

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Most popular questions from this chapter

(Glycolytic/Oxidative) fibers contain high concentrations of the oxygen- binding protein myoglobin.

Glycolytic fibers generate more force than oxidative fibers because they are larger in diameter. (true/false)

Which of the following would tend to reduce the concentration of lactic acid that accumulates in a muscle cell as a result of contractile activity? a) Increasing the concentration of glycolytic enzymes b) Decreasing the axygen supply to the cell c) Increasing the diameter of the cell d) Increasing the number of mitochondria in the cell e) All of the above

When a muscle cell is relaxed and intracellular ATP levels are normal, a crossbridge will remain in which of the following states? a) Bound to actin and in the low-energy form b) Bound to actin and in the high-energy form c) In the high-energy form, with ADP and \(P_{i}\) bound to it d) In the high-energy form, with ATP bound to it e) In the low-energy form with nothing bound to it

Which of the following statements is a valid generalization regarding the properties of smooth muscle? a) Neurotransmitters can either excite or inhibit smooth muscle contraction, but any given neurotransmitter is always excitatory or inhibitory, regardless of where the muscle is located. b) A given smooth muscle cell can respond to more than one type of neurotransmitter. c) Smooth muscle cells are generally unresponsive to neurotransmitters of all types. d) Smooth muscle cells can respond to neural input from the somatic or autonomic nervous systems. e) None of the above.
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