Which of the following surrounds the individual muscle cell?
perimysium
epimysium
endomysium
myofibril
The Correct Answer is C
Choice A reason: Perimysium surrounds bundles of muscle fibers known as fascicles, not individual muscle cells. It provides structural support and carries blood vessels and nerves.
Choice B reason: Epimysium is the outermost layer of connective tissue that surrounds the entire muscle. It does not envelop individual muscle cells.
Choice C reason: Endomysium is the correct answer. It is a thin layer of connective tissue that surrounds each individual muscle fiber (cell), providing structural integrity and facilitating capillary exchange.
Choice D reason: Myofibrils are intracellular structures within muscle cells that contain the contractile proteins actin and myosin. They are not connective tissue and do not surround muscle cells.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Choice A reason: Supraspinatus is one of the four rotator cuff muscles. It originates from the supraspinous fossa of the scapula and inserts on the greater tubercle of the humerus, aiding in shoulder abduction and stabilization.
Choice B reason: Infraspinatus is a rotator cuff muscle that originates from the infraspinous fossa of the scapula and inserts on the greater tubercle of the humerus. It functions in external rotation of the shoulder.
Choice C reason: Rhomboid minor is not part of the rotator cuff. It is located in the upper back and functions to retract the scapula. It does not attach to the humerus or contribute to shoulder joint stabilization.
Choice D reason: Teres minor is a rotator cuff muscle that originates from the lateral border of the scapula and inserts on the greater tubercle of the humerus. It assists in external rotation and stabilization of the shoulder.
Choice E reason: Subscapularis is the fourth rotator cuff muscle. It originates from the subscapular fossa and inserts on the lesser tubercle of the humerus, functioning in internal rotation of the shoulder.
Correct Answer is B
Explanation
acromion is a projection of another bone.
Choice B reason: The scapula is the correct answer. The acromion is a bony process on the scapula that extends laterally over the shoulder joint and articulates with the clavicle to form the acromioclavicular joint.
Choice C reason: The ulna is a forearm bone and does not have an acromion. It forms part of the elbow joint.
Choice D reason: The scaphoid is a carpal bone in the wrist and is unrelated to the shoulder girdle or the acromion.
Choice E reason: The pollex refers to the thumb and is not associated with the acromion or shoulder anatomy.
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