Match the termsZ-disc, sarcomere, A band, H zone, I band, and M line with the most closely related descriptions given below: The dark band containing the entire length of the thick filament The band of proteins in the middle of the H zone The boundary between sarcomeres The functional unit of contraction The middle region of the A band containing only thick filaments The light band containing only thin filaments Introduction: Musclesare formed of muscle fibers. Muscle fibers are formed of proteins and usually, the fibers are striated. The basic unit of striated muscles issarcomere. The muscle fibers are formed of myofibrils. These myofibrils are formed of alternate sections of the sarcomere. Two important proteins of the filament are myosin and actin. Sarcomeresappear as light and dark bands. The different regions of the bands have different names such as I band, A band, H zone, Z-disc, and M line.

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Chapter 10, Problem 4CYR

Summary Introduction

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Match the termsZ-disc, sarcomere, A band, H zone, I band, and M line with the most closely related descriptions given below:

The dark band containing the entire length of the thick filament

The band of proteins in the middle of the H zone

The boundary between sarcomeres

The functional unit of contraction

The middle region of the A band containing only thick filaments

The light band containing only thin filaments

Introduction:

Musclesare formed of muscle fibers. Muscle fibers are formed of proteins and usually, the fibers are striated. The basic unit of striated muscles issarcomere. The muscle fibers are formed of myofibrils. These myofibrils are formed of alternate sections of the sarcomere. Two important proteins of the filament are myosin and actin. Sarcomeresappear as light and dark bands. The different regions of the bands have different names such as I band, A band, H zone, Z-disc, and M line.

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Match the following terms with the correct definition._____ Z-disc a. The dark band containing the entire length of the thick filament _____ Sarcomere b. The band of proteins in the middle of the H zone_____ A band c. The boundary between sarcomeres_____ H zone d. The functional unit of contraction_____ I band e. The middle region of the A band containing only thick filaments_____ M line f. The light band containing only thinfilaments

During sarcomere contraction, _________ first has to bind to ________ Select one: a. Calcium, troponin b. Calcium, microfilaments c. Sodium, troponin d. Sodium tropomysin e. Potassium, microfilaments

Concerning the cross-bridge (CB) power stroke, it is true that: O a. All of these O b. In concentric contractions, the CB power stroke pulls the actin filament toward the center of the sarcomere, causing sarcomere shortening O C. In isometric contractions, the CB power stroke pulls the actin filament straight down, preventing shortening or lengthening O d. In eccentric contractions, the CB power stroke pushes the actin filament away from the center of the sarcomere, causing sarcomere lengthening TOSHIBA