Creatine phosphate functions in the muscle cell by:
Forming a temporary chemical compound with myosin
Breaking down ATP to ADP
Storing energy that will be transferred to ADP to resynthesize ATP
Forming a chemical compound with actin
Inducing a conformational change in the myofilaments
The Correct Answer is C
Choice A reason: Creatine phosphate does not interact directly with myosin. Its role is in energy storage and transfer, not in forming structural compounds with contractile proteins.
Choice B reason: ATP is broken down to ADP during muscle contraction, but creatine phosphate does not perform this breakdown. Instead, it helps regenerate ATP from ADP.
Choice C reason: This is the correct answer. Creatine phosphate stores high-energy phosphate groups and donates them to ADP to rapidly regenerate ATP during short bursts of intense muscular activity.
Choice D reason: Creatine phosphate does not form compounds with actin. Its function is metabolic, not structural.
Choice E reason: While ATP binding and hydrolysis induce conformational changes in myofilaments, creatine phosphate itself does not directly cause these changes. It supports ATP regeneration.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
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.
Correct Answer is D
Explanation
Choice A reason: The medullary cavity is found in the diaphysis of long bones and contains bone marrow. It is not a feature of spongy bone.
Choice B reason: Lamellar bone refers to mature bone with organized collagen fibers. While spongy bone can be lamellar, this does not define its structural organization.
Choice C reason: Osteons, or Haversian systems, are cylindrical structures found in compact bone, not spongy bone.
Choice D reason: Trabeculae are the defining structural units of spongy bone. They are lattice-like networks of bone tissue that provide strength while minimizing weight and house bone marrow between their spaces.
Whether you are a student looking to ace your exams or a practicing nurse seeking to enhance your expertise , our nursing education contents will empower you with the confidence and competence to make a difference in the lives of patients and become a respected leader in the healthcare field.
Visit Naxlex, invest in your future and unlock endless possibilities with our unparalleled nursing education contents today
Report Wrong Answer on the Current Question
Do you disagree with the answer? If yes, what is your expected answer? Explain.
Kindly be descriptive with the issue you are facing.