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Correct Answer: a video of ballroom dancers is labeled smooth muscles.
mrs. guy is using videos to help her third grade class understand the different types of muscle tissues in the human body. there are three primary types of muscles: striated (skeletal), smooth, and cardiac. each type of muscle has distinct functions and characteristics. to effectively teach this concept, mrs. guy has chosen a series of videos where each video should ideally correspond to the type of muscle it represents.
one video shows a lacrosse team playing and is labeled as demonstrating striated muscles. this label is correct because striated muscles, also known as skeletal muscles, are responsible for voluntary movements. the players in the lacrosse team are intentionally moving their bodies to play the game, which involves the use of these striated muscles.
another video features ballroom dancers and is labeled as showing smooth muscles. this label is incorrect. smooth muscles are found in various parts of the body such as the walls of the stomach and intestines, and they control involuntary movements. for example, they help in digestion and other automatic bodily functions. ballroom dancing, however, involves deliberate and controlled movements, requiring the use of striated muscles, just like the lacrosse players. therefore, the video of the ballroom dancers should be labeled as demonstrating striated muscles, not smooth muscles.
a third video shows sleeping kittens and is labeled as demonstrating involuntary muscles. this label is accurate in a broad sense if it refers to involuntary actions controlled by smooth muscles, such as the breathing movements seen in the sleeping kittens. smooth muscles work without conscious control, managing functions like breathing and adjusting the pupils of the eyes.
finally, a video showing a beating heart is labeled as demonstrating cardiac muscles. this is correct because cardiac muscle is a specialized type of muscle found only in the heart. it is responsible for pumping blood throughout the body and, like smooth muscle, operates involuntarily.
in summary, the video that is incorrectly labeled is the one showing ballroom dancers marked as demonstrating smooth muscles. this video should be correctly labeled to show striated muscles, as the dancers are using voluntary muscle movements to perform their dance routines.
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