The basic unit of structure and function in the nervous system is
the neuron.
a. true
b. false
17 Answer:
The endocrine system produces chemical messengers called enzymes.
a. true
b. false
18 Answer:
The thyroid is a link between the nervous and endocrine systems.
a. true
b. false
19 Answer:
Axons connect sensory neurons to motor neurons.
a. true
b. false
20 Answer:
The parathyroids regulate the level of calcium in the blood.
a. true
b. false