The endocrine glands a. transmit information from the sensory organs to the brain.
b. secrete hormones directly into the bloodstream.
c. are instrumental in producing myelin, which protects the neurons.
d. secrete neurotransmitters into the brain.

B.secrete hormones directly into the bloodstream

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.