Question

multiple choice question
the ______ system is a chemical communication network that sends messages throughout the body via the bloodstream.

• lymphatic
• circulatory
• nervous
• endocrine

Explanation:

The endocrine system uses hormones (chemical messengers) transported via the bloodstream to communicate throughout the body. The lymphatic system deals with lymph and immunity, circulatory with blood transport (not chemical messaging), and nervous with electrical/chemical signals via neurons (not bloodstream - based chemical communication network).

Answer:

D. endocrine