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What does the endocrine system do?

  1. Controls muscle movement

  2. Secrete hormones into the bloodstream

  3. Connects the two brain hemispheres

  4. Processes body sensations

The correct answer is: Secrete hormones into the bloodstream

The endocrine system is responsible for secreting hormones into the bloodstream. Option A is incorrect because it is the nervous system that controls muscle movement. Option C connects to the nervous system, not the endocrine system. Option D refers to the sensory system, which is also not part of the endocrine system. Therefore, the correct answer is B as it accurately describes the primary function of the endocrine system.