Muscles can contract while extending a joint or flexing a joint. what is the name for these types of movements?

The term that best describes the extending and flexing of muscle joints would be a muscle contraction. In addition, this specific form of body movement mainly emphasizes the production of muscle tension in the muscle fibers when we do strenuous activities like weights and exercise.

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The answer would be d. most contraceptives are effective when used properly

It's called the nephron.