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MBBS Muscle Tissue — practice questions

Explore 13 free Muscle Tissue questions in MBBS Physiology. Open each question or exercise to read its content, reference answers and available explanation.

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Muscle Tissue questions and exercises with answers

Showing questions 1–13 of 13.

What are the three types of muscle tissue found in the human body?Read the answer and worked solution →Which quality of muscle tissue allows it to recoil back to its original length after being stretched?Read the answer and worked solution →Which structure, bordered on either side by Z-discs, is described as the functional unit of a skeletal muscle fiber?Read the answer and worked solution →Approximately how far does a thin filament move toward the M-line during a single power stroke of the cross-bridge cycle?Read the answer and worked solution →Duchenne muscular dystrophy (DMD) results from a lack of which protein, which normally helps thin filaments of myofibrils bind to the sarcolemma?Read the answer and worked solution →An isometric contraction generates increasing muscle tension without producing which of the following?Read the answer and worked solution →According to the length-tension relationship, at what range of a sarcomere's resting length is maximal contractile tension produced?Read the answer and worked solution →Slow oxidative (SO) muscle fibers appear red mainly because of their high content of which oxygen-storing molecule?Read the answer and worked solution →In smooth muscle, cross-bridge formation is regulated not by troponin but by which calcium-binding regulatory protein that activates myosin light-chain kinase?Read the answer and worked solution →Order the cross-bridge cycleRead the answer and worked solution →True or false: muscle physiologyRead the answer and worked solution →Which one is higher?Read the answer and worked solution →Quick pick: muscle physiologyRead the answer and worked solution →

Worked practice questions

What are the three types of muscle tissue found in the human body?

  1. Skeletal, cardiac, smooth
  2. Cardiac, smooth, fibrous
  3. Skeletal, visceral, striated
  4. Skeletal, smooth, elastic
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Correct answer: A. Skeletal, cardiac, smooth

1. Muscle is classified into three types found throughout the body. 2. These are skeletal muscle, cardiac muscle, and smooth muscle. 3. All three share properties such as excitability, but differ in location and control. 4. "Fibrous", "visceral" (alone), and "elastic" are not the standard names for the three muscle tissue types. _Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 10 "Muscle Tissue", section 10.1, p. 406_

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Which quality of muscle tissue allows it to recoil back to its original length after being stretched?

  1. Contractility
  2. Elasticity
  3. Extensibility
  4. Excitability
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Correct answer: B. Elasticity

1. Besides excitability, muscle tissue has other passive and active qualities. 2. Elasticity is defined as the ability to recoil back to the original length due to elastic fibers. 3. Extensibility is the separate ability to stretch or extend, not to recoil back. 4. Contractility is the ability to pull on attachment points and shorten with force, a different property from recoil. _Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 10 "Muscle Tissue", section 10.1, p. 406_

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Which structure, bordered on either side by Z-discs, is described as the functional unit of a skeletal muscle fiber?

  1. The sarcomere
  2. The fascicle
  3. The triad
  4. The myofibril
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Correct answer: A. The sarcomere

1. A myofibril running the length of a muscle fiber is built from many repeating contractile units. 2. Each of these units is bordered by Z-discs and is called the sarcomere. 3. Because it is the smallest unit that actually shortens, the sarcomere is described as the functional unit of the fiber. 4. A myofibril contains thousands of sarcomeres, a fascicle is a bundle of whole fibers, and a triad is a T-tubule/SR complex so none of these is itself the Z-disc-bordered contractile unit. _Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 10 "Muscle Tissue", section 10.2, p. 410_

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