NURSING EXAM QUESTIONS
HUMAN ANATOMY PHYSIOLOGY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Steroid
|
|
|
Lipid
|
|
|
Cholesterol
|
|
|
Triglyceride
|
Detailed explanation-1: -Cholesterol is an important component of plasma membranes (PMs) and the precursor of all steroid hormones. In steroidogenic tissues, upon hormone stimulation, there is a rapid transfer of cholesterol to the mitochondria, which is the site of the initial step in steroidogenesis.
Detailed explanation-2: -Steroid hormones are derived from a common precursor molecule, cholesterol, via the metabolic pathway schematically outlined in Figure 21-1.
Detailed explanation-3: -All classes of steroid hormones, glucocorticoids, mineralocorticoids, and sex hormones, are derivatives of cholesterol. Synthesis occurs in the placenta and ovaries (estrogens and progestins), testes (testosterone), and adrenal cortex (cortisol, aldosterone, and androgens).