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  • Membranes,Transport,and Signaling
  • Long-distance messenger molecules used by the endocrine s...
Multiple choice

Long-distance messenger molecules used by the endocrine system are called _.

  1. hormones

  2. impulses

  3. triggers

  4. synapses

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Hormones are chemical messengers secreted into the blood that travel long distances to reach target cells. Impulses refer to electrical signals in neurons.

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