Types of efferent nerve pathways

What neurotransmitter is released by the nerve fibres labelled '?'

Which receptors are labelled '?', and where do they exist?

What chemical is released by the post-ganglionic fibre innervating the salivary glands?

Which chemical is released by the postganglionic fibre innervating the blood vessel?

What is the name of the chemical released by the postganglionic fibre innervating the sweat glands?

What are the names of the 2 chemicals released by the adrenal medulla?

Name the receptor labelled '?'

Name the

Name the receptor labelled '?'

Name the receptor labelled '?'

Name the receptor labelled '?'