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MBBS Physiology — practice by topic

Browse 43 questions across 3 Physiology topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Physiology topics

The Cardiovascular System: The Heart (17)Muscle Tissue (13)The Digestive System (13)

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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 →

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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