Endocrine System

    Endocrine System
    Which hormone is the one made in greatest quantity by the thyroid gland?
    Thyroxine is about 90% tetraiodothyronine and 10% triiodothyronine.
    Author: rikazzz Comment
    Endocrine System
    How do steroid hormones differ from amino acid-based hormones?
    Steroid hormones are lipid soluble so can enter the cell to bind to receptors located inside the cell. Amino acid-based hormones are not lipid soluble so their receptors are located outside the cell on the plasma membrane.
    Author: rikazzz Comment
    Endocrine System
    Hormones may produce their action by several mechanisms. Which of the following is one such mechanism?
    Steroid hormones may diffuse into the cell to bind to receptors that activate a gene to synthesise a specific protein.
    Author: rikazzz Comment
    Endocrine System
    To which type of chemical does the definition “a messenger made in small quantities and released into circulation” refer?
    A hormone is a chemical messenger that is transported in blood (the circulation).
    Author: rikazzz Comment
    Endocrine System
    What are the two parts of the pituitary gland known as?
    Anterior pituitary (epithelial tissue) and posterior pituitary (neural tissue).
    Author: rikazzz Comment
    Endocrine System
    Which statement about the hypothalamus is correct?
    The hypothalamus is part of the brain so is composed of neural tissue. Epinephrine and norepinephrine are released from the adrenal medulla.
    Author: rikazzz Comment
    Endocrine System
    What is the difference between an exocrine gland and an endocrine gland?
    Endocrine glands secrete “circulating” hormones, that is, secrete into the blood.
    Author: rikazzz Comment
    Endocrine System
    What is produced in the adrenal cortex?
    “Cortico”steroids are made in the adrenal cortex. Choices B and C are the same – these hormones are made in the adrenal medulla.
    Author: rikazzz Comment
    Endocrine System
    Which organ produces luteinising hormone?
    The anterior pituitary releases LH along with FSH.
    Author: rikazzz Comment
    Endocrine System
    Which hormones have their receptors inside their target cell?
    Choice D is also correct, but B is the better answer as thyroid hormones cross membrane by a carrier mechanism.
    Author: rikazzz Comment