Question

multiple choice question
both the endocrine and nervous systems use chemical messengers. what is one difference between the hormones of the endocrine system and the neurotransmitters of the nervous system?

hormones are transported in the blood, neurotransmitters are released into the synaptic cleft.
hormones are released into the synaptic cleft, neurotransmitters are transported in the blood
only hormones are released outside of the cells that produce them.
only hormones bind to receptors.

Explanation:

Hormones are secreted by endocrine glands into the bloodstream and travel to target cells throughout the body. Neurotransmitters are released by neurons into the synaptic cleft (the small gap between neurons) to communicate with adjacent cells. Both hormones and neurotransmitters are released outside of the cells that produce them and both bind to receptors.

Answer:

Hormones are transported in the blood, neurotransmitters are released into the synaptic cleft.