Myoglobin __________.
Stores oxygen in muscle cells
Is a protein involved in the direct phosphorylation of ADP
Breaks down glycogen
Transports oxygen throughout the muscle tissue
Produces the end plate potential
The Correct Answer is A
Choice A reason: Myoglobin is a red pigment found in muscle cells that binds oxygen molecules. It serves as an oxygen reservoir, especially important during periods of intense muscular activity when oxygen demand exceeds supply. Its high affinity for oxygen allows it to release oxygen when intracellular levels drop, supporting aerobic metabolism.
Choice B reason: The protein involved in the direct phosphorylation of ADP is creatine kinase, which facilitates the transfer of a phosphate group from creatine phosphate to ADP. Myoglobin is not involved in this process.
Choice C reason: Glycogen breakdown is catalyzed by enzymes such as glycogen phosphorylase. Myoglobin does not participate in carbohydrate metabolism or glycogenolysis.
Choice D reason: Oxygen transport throughout the body is primarily the function of hemoglobin in red blood cells. Myoglobin stores oxygen locally within muscle cells rather than transporting it across tissues.
Choice E reason: The end plate potential is generated at the neuromuscular junction due to the influx of sodium ions following acetylcholine binding. This is an electrical event and does not involve myoglobin.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
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.
Correct Answer is D
Explanation
Choice A reason: Epiphysis and diaphysis refer to regions of a long bone—the ends and shaft respectively—not to the coverings of bone surfaces.
Choice B reason: This reverses the anatomical regions but still does not address the coverings of bone surfaces.
Choice C reason: Compact bone and spongy bone are types of bone tissue, not the membranes that line or cover bone surfaces.
Choice D reason: The periosteum is a dense fibrous membrane that covers the external surface of bones, providing attachment points for tendons and ligaments and housing blood vessels and nerves. The endosteum lines the internal surfaces, including the medullary cavity, and plays a role in bone growth and remodeling.
Choice E reason: This reverses the correct anatomical relationship. The endosteum lines the internal surface, not the external.
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