The arrows indicate the flow of air in of the human body through the respiratory system organs. In the above diagram, the air at first enters through the nose, then flows through the nasal cavity, pharynx, larynx, trachea, and then into the lungs through the Bronchi.
The endocrine system gets some help from organs such as the kidney, liver, heart and gonads, which have secondary endocrine functions. The kidney, for example, secretes hormones such as erythropoietin and renin.
These glands are also called 'ductless glands' meaning that the glands directly empty the hormones into the bloodstream. There are four types of hormones, namely, steroid, lipid, protein and amino acid hormones. Hormones control the various metabolic activities of the body.They help to provide the proper amount of energy and nutrition your body needs to function.arious endocrine glands secrete hormones into the blood, which carries them throughout the body. When a hormone arrives at its target organ or tissue it causes certain actions to take place. Hormones may be grouped according to the functions they control.