Anatomy And Physiology Advanced - Qp3
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Muscles comprise approximately 45% of total body weight, and there are in excess of ______ in the human body.
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400 muscles
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500 muscles
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600 muscles
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700 muscles
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This advanced quiz, titled 'Anatomy and Physiology Advanced - QP3', assesses knowledge on human muscles, skeletal functions, and muscle types. It is designed for learners seeking to deepen their understanding of human anatomy, focusing on muscle structure and function.
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- 2.
Skeletal muscles are found only in the walls of the heart and are used to force blood into the circulatory vessels.
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True
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False
Correct Answer
A. FalseExplanation
Skeletal muscles are not found in the walls of the heart. The walls of the heart are composed of cardiac muscle, which is a specialized type of muscle tissue. Skeletal muscles are found throughout the body and are responsible for voluntary movements.Rate this question:
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- 3.
Skeletal muscle has several important functions within the body which includes: (Select three)
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Movement
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Blood production
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Support and posture
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Heat production
Correct Answer(s)
A. Movement
A. Support and posture
A. Heat productionExplanation
Skeletal muscle is responsible for movement in the body, as it allows us to walk, run, and perform various activities. It also plays a crucial role in maintaining support and posture by providing stability to the skeletal system. Additionally, skeletal muscle generates heat through the process of muscle contraction, which helps regulate body temperature.Rate this question:
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- 4.
The muscle belly is the thick portion of muscle tissue sited between the origin and insertion.
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True
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False
Correct Answer
A. TrueExplanation
The statement is true because the muscle belly is indeed the thick portion of muscle tissue that lies between the origin and insertion points. The origin is the point where the muscle attaches to a stationary bone, while the insertion is the point where the muscle attaches to a movable bone. The muscle belly is the fleshy part of the muscle that contracts and relaxes, allowing movement to occur at the joint.Rate this question:
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- 5.
______ take place when a muscle increases in tension without actively shortening or lengthening.
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Isotonic contractions
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Isometric contractions
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Isokinetic contractions
Correct Answer
A. Isometric contractionsExplanation
Isometric contractions occur when a muscle increases in tension without actively shortening or lengthening. In this type of contraction, the muscle remains at a constant length while generating force against an immovable object or resisting an external force. This can be seen, for example, when holding a weight in a static position without any movement in the joint. Isotonic contractions involve muscle shortening or lengthening, while isokinetic contractions involve the muscle contracting at a constant speed.Rate this question:
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- 6.
The myosin and actin filaments run adjacent to each other but at rest are not attached.
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True
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False
Correct Answer
A. TrueExplanation
The statement is true because myosin and actin filaments in muscle cells are arranged in a way that they run parallel to each other, but they are not physically attached when the muscle is at rest. However, during muscle contraction, the myosin heads bind to the actin filaments, causing them to slide past each other and generate force. This interaction between myosin and actin is essential for muscle contraction and movement.Rate this question:
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- 7.
All skeletal muscle reacts to an chemical stimulus, which is conducted from the brain to the muscle via nerves.
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True
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False
Correct Answer
A. FalseExplanation
Skeletal muscle does not react to a chemical stimulus conducted from the brain to the muscle via nerves. Instead, skeletal muscle reacts to an electrical stimulus called an action potential, which is conducted from the brain to the muscle via nerves. This electrical stimulus triggers muscle contraction. Therefore, the given statement is false.Rate this question:
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- 8.
Each fibre within a motor unit contracts according to the ______.
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Golgi tendon organs
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All or none law
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Sliding filament theory
Correct Answer
A. All or none lawExplanation
The correct answer is "all or none law". The all or none law states that once a motor unit is sufficiently stimulated, all of the muscle fibers within that motor unit will contract to their fullest extent. This means that either all of the fibers in the motor unit will contract or none of them will contract, there is no partial contraction. This principle helps to ensure that muscle contractions are coordinated and produce a smooth and efficient movement.Rate this question:
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Current Version
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Aug 28, 2023Quiz Edited by
ProProfs Editorial Team -
Jan 06, 2014Quiz Created by
Jackson Matthews
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