The glenohumeral joint that articulates the humerus to the pectoral girdle is a highly mobile joint. This mobility comes at a cost because:
These types of joints are harder to control and coordinate
The ligaments around the joint are loosely arranged
They only provide a reduced amount of power
The blood vessels that lead to the arm and hand can easily be cut off by the free range of motion
The joint is relatively unstable and can easily dislocate
The Correct Answer is E
Choice A reason: While coordination is important in highly mobile joints, this is not the primary reason for the vulnerability of the glenohumeral joint.
Choice B reason: Ligaments around the shoulder joint are indeed more flexible to allow movement, but this alone does not fully explain the joint’s instability.
Choice C reason: Power generation is not significantly reduced due to mobility. Muscles around the shoulder can generate substantial force.
Choice D reason: Blood vessels are generally well protected and not easily compromised by joint movement. This is not a common consequence of shoulder mobility.
Choice E reason: This is the correct answer. The glenohumeral joint is a ball-and-socket joint with a shallow socket, allowing extensive range of motion. However, this anatomical configuration makes it relatively unstable and prone to dislocation, especially during forceful or awkward movements.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Choice A reason: The frontal bone is part of the axial skeleton. It forms the forehead and contributes to the cranial vault.
Choice B reason: The mandible is the lower jawbone and is part of the axial skeleton due to its role in craniofacial structure.
Choice C reason: The scapula, or shoulder blade, is part of the appendicular skeleton. It connects the humerus (arm bone) with the clavicle and facilitates upper limb movement.
Choice D reason: The thoracic vertebrae are part of the vertebral column, which is central to the axial skeleton.
Choice E reason: The stapes is one of the auditory ossicles located in the middle ear and is part of the axial skeleton due to its role in sound transmission within the skull.
Correct Answer is D
Explanation
Choice A reason: Elasticity refers to the ability of muscle tissue to return to its original shape after being stretched or contracted. It is a fundamental property of muscle.
Choice B reason: Extensibility is the ability of muscle to be stretched without being damaged. This allows muscles to accommodate movement and joint flexibility.
Choice C reason: Excitability is the ability of muscle cells to respond to stimuli, typically from the nervous system. This property is essential for initiating contraction.
Choice D reason: Secretion is not a property of muscle tissue. It refers to the release of substances from glands or cells, such as hormones or enzymes, and is not involved in muscle function.
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