Endocrine System

    Endocrine System
    Which statement below is true of steroid hormones?
    Steroids are lipid soluble so diffuse through the plasma membrane to bind to a receptor within the cell.
    Author: rikazzz Comment
    Endocrine System
    Which structure integrates the activities of the endocrine system and the nervous system?
    The hypothalamus is located in the brain and also produces regulatory hormones.
    Author: rikazzz Comment
    Endocrine System
    Which organ produces the most testosterone?
    The testes produce testosterone, but the ovaries produce a small amount too.
    Author: rikazzz Comment
    Endocrine System
    Which of the following hormones CANNOT cross the plasma membrane?
    Amino acid-based hormones are water soluble but not lipid soluble, so cannot cross the plasma membrane.
    Author: rikazzz Comment
    Endocrine System
    What is the function of insulin?
    Insulin lowers the level of glucose in the blood. The other three choices are about increasing the blood glucose level.
    Author: rikazzz Comment
    Endocrine System
    An amino acid-based hormone binds to its receptor. This has the effect of:
    After a hormone binds to its receptor, a G (for guanine) protein is activated as the first effect. The G-protein then moves along the membrane to activate an enzyme that produces, for example, cAMP, which is a “second messenger”.
    Author: rikazzz Comment
    Endocrine System
    What controls the blood glucose level?
    Insulin increases blood glucose, while glucagon decreases blood glucose. Glycogen is not a hormone, so it does not affect the level of glucose in the blood.
    Author: rikazzz Comment
    Endocrine System
    Finish the sentence so that it is correct: A hormone may be defined as a chemical messenger that:
    Hormones travel through the blood to all parts of the body and only small quantities are required.
    Author: rikazzz Comment
    Endocrine System
    One of the following groups of hormones has their receptor inside the cell. Which one?
    Steroids are lipids, hence are lipid soluble so can enter the cell.
    Author: rikazzz Comment
    Endocrine System
    Which one of the following is NOT true of peptide hormones?
    The receptors for peptide hormones are located on the plasma membrane as they are unable to penetrate the plasma membrane.
    Author: rikazzz Comment