Exercise Physiology - Qp4

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| By Jackson Matthews
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Jackson Matthews
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Quizzes Created: 588 | Total Attempts: 688,372
Questions: 12 | Attempts: 200

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Exercise Physiology - Qp4 - Quiz


Questions and Answers
  • 1. 

    The myofibrils are embedded in the cell’s sarcoplasm.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    The myofibrils are indeed embedded in the cell's sarcoplasm. Sarcoplasm is the cytoplasm of muscle cells, and it contains the myofibrils, which are responsible for muscle contraction. These myofibrils consist of protein filaments called actin and myosin, which slide past each other during muscle contraction. Therefore, it is correct to say that myofibrils are embedded in the sarcoplasm of muscle cells.

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  • 2. 

    Sarcomeres have a highly organised structure and is composed of ______ protein-based myofilaments.

    • A.

      Two

    • B.

      Three

    • C.

      Four

    Correct Answer
    A. Two
    Explanation
    Sarcomeres have a highly organized structure and are composed of two protein-based myofilaments. These myofilaments are called actin and myosin. Actin filaments are thin and extend from the Z-discs towards the center of the sarcomere, while myosin filaments are thick and are located in the center of the sarcomere, overlapping with actin filaments. The interaction between actin and myosin filaments is responsible for muscle contraction. Therefore, sarcomeres consist of these two types of myofilaments, making the correct answer "two".

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  • 3. 

    The brain and spinal cord are referred to as the ______ nervous system.

    • A.

      Parasympathetic

    • B.

      Sympathetic

    • C.

      Central

    • D.

      Autonomic

    Correct Answer
    C. Central
    Explanation
    The brain and spinal cord are referred to as the central nervous system because they are the main components responsible for coordinating and controlling the body's activities. The central nervous system receives and processes information from the senses, sends signals to the muscles and organs, and regulates bodily functions. The parasympathetic and sympathetic nervous systems are components of the autonomic nervous system, which works in conjunction with the central nervous system to regulate involuntary bodily functions.

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  • 4. 

    Motor neurones (nerves) are made up of three parts: (Select two)

    • A.

      The cell body

    • B.

      The nuclei

    • C.

      The axon

    Correct Answer(s)
    A. The cell body
    C. The axon
    Explanation
    Motor neurones, also known as nerves, consist of three main components: the cell body and the axon. The cell body is the central part of the neurone, containing the nucleus and other organelles necessary for its functioning. The axon, on the other hand, is a long, slender projection that transmits electrical impulses from the cell body to other neurons or muscle cells. The nuclei, which are not mentioned in the given options, are clusters of cell bodies found within the central nervous system. Therefore, the correct answer is the cell body and the axon.

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  • 5. 

    The relaxation of muscle is an active process.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    The relaxation of muscle is not an active process. When a muscle relaxes, it is actually returning to its resting state passively, without requiring any active effort or energy expenditure. This is in contrast to muscle contraction, which is an active process that requires the expenditure of energy. Therefore, the statement that the relaxation of muscle is an active process is false.

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  • 6. 

    The proprioceptors are very sensitive receptors which exist between skeletal muscle fibres.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    The statement is false because proprioceptors are not located between skeletal muscle fibers. Proprioceptors are sensory receptors that are located in muscles, tendons, and joints, and they provide information about body position and movement. They play a crucial role in maintaining balance and coordinating movements.

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  • 7. 

    The muscle belly is completely surrounded by a thick connective tissue called epimysium.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    The explanation for the given correct answer is that the muscle belly, which refers to the main body of the muscle, is indeed surrounded by a dense and protective connective tissue called epimysium. This epimysium serves as a sheath that encloses the muscle and provides structural support, allowing the muscle to contract and generate force effectively. It also helps to maintain the shape and integrity of the muscle. Therefore, the statement "The muscle belly is completely surrounded by a thick connective tissue called epimysium" is true.

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  • 8. 

    The action of the sliding filaments during contraction causes lengthing of all sarcomeres, and therefore all muscle fibres.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    The statement given in the question is incorrect. The action of the sliding filaments during contraction does not cause lengthening of all sarcomeres and muscle fibers. Instead, it causes the sarcomeres to shorten, resulting in the contraction of the muscle fibers. Therefore, the correct answer is False.

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  • 9. 

    The myelin sheath is continuous.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    The myelin sheath is not continuous. It is made up of individual segments called internodes, which are separated by small gaps called nodes of Ranvier. This non-continuous structure allows for saltatory conduction, where the electrical signal jumps from one node to the next, increasing the speed of nerve impulse transmission.

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  • 10. 

    The All or None Law states that when a motor unit receives a stimulus of sufficient intensity to bring forth a response, all the muscle fibres within the unit will contract at the same time, and to the maximum possible extent.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    The All or None Law is a principle in physiology that states that when a motor unit, which consists of a motor neuron and the muscle fibers it innervates, receives a stimulus that is strong enough to elicit a response, all the muscle fibers within that unit will contract simultaneously and to their maximum extent. This means that either all the muscle fibers contract or none of them do, there is no in-between. Therefore, the statement "all the muscle fibers within the unit will contract at the same time, and to the maximum possible extent" accurately describes the All or None Law, making the answer true.

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  • 11. 

    The Golgi tendon organs are thick capsules of connective tissue which exist where muscle fibre and tendon meet.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    The Golgi tendon organs are not thick capsules of connective tissue. They are actually sensory receptors located within the tendons near the muscle-tendon junction. These receptors are responsible for detecting changes in muscle tension and transmitting this information to the central nervous system. Therefore, the statement that Golgi tendon organs are thick capsules of connective tissue is incorrect.

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Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Sep 05, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Jan 01, 2014
    Quiz Created by
    Jackson Matthews
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