The nurse is assessing the client who states a decline in muscle strength. Which is the primary source essential to allow muscle contraction?
A) Myofibrils
B) Sarcomeres
C) Acetylcholine
D) Actin and myosin
A
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Skeletal muscles are made up of muscle cells or fibers called myofibrils. Without muscle fibers, there can be no muscle contraction. Sliding filaments called sarcomeres make up the myofibrils. Acetylcholine stimulates the motor neuron, which innervated the muscle. Actin and myosin in the sarcomere slide together, resulting in muscle contraction.
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The anatomy class is learning about the abdomen. The instructor would tell the class that the abdominal cavity is bordered on the back by
A) The lower rib cage B) The vertebral column C) The kidneys D) The midaxillary lines
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A) Variation in the dependent variable that the researcher cannot explain B) The computer programs that analyze research data C) The constructs of interest to researchers that have defied measurement efforts D) The underlying, unmeasured causes or mediators of the observed effects of an intervention
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