Question

lo 1.3. what are endocrine glands responsible for producing?
antibodies
proteins
enzymes
hormones
neurotransmitters

Explanation:

Endocrine glands secrete hormones directly into the bloodstream. Antibodies are produced by immune cells (like B - lymphocytes). Proteins are synthesized by cells in general (e.g., ribosomes in cells). Enzymes can be produced by various cells (e.g., digestive enzyme - producing cells in the gut). Neurotransmitters are produced by nerve cells (neurons).

Answer:

Hormones