What type of hormones does the endocrine system primarily produce?

The endocrine system is primarily responsible for the production and secretion of hormones, which are chemical messengers that travel through the bloodstream to target organs or tissues, guiding various bodily functions. Insulin and adrenaline are both classified as hormones produced by endocrine glands.

Insulin is produced by the pancreas and plays a crucial role in regulating blood sugar levels by facilitating the uptake of glucose by cells. Adrenaline, also known as epinephrine, is produced by the adrenal glands and is involved in the fight-or-flight response, preparing the body for rapid action during stressful situations by increasing heart rate and energy availability.

The other options do not pertain to hormones produced by the endocrine system. Neurotransmitters and enzymes, for instance, are not hormones; rather, they are chemical substances that transmit signals within the nervous system or facilitate biochemical reactions, respectively. Amino acids and fatty acids, while they are important biological molecules, are not classified as hormones but rather as building blocks for proteins and components of lipids. Lastly, proteins and carbohydrates also do not represent the primary products of the endocrine system; they are macromolecules involved in various structural and functional roles in the body, but they are not hormones produced by the endocrine glands. Thus, the correct answer