Which hormone type always attaches to a membrane-bound receptor in order to affect a target cell?

Which structural class of hormone is derived from cholesterol and can be identified by its four ring molecular structure?

What type of hormone is insulin?

Which of the following hormones is responsible for setting the basal metabolic rate?

Which of the following hormones is secreted by the adrenal medulla?

Which organ is known as the "master" endocrine gland?

Aldosterone is a hormone that is activated by the renin-angiotension pathway. It plays an important role in regulating the body sodium levels and plasma volume levels. What is another factor regulating aldosterone in the body?