Question: Q1) Which Of The Following Is The Rate-limiting Step In Progesterone Synthesis By The Corpus Luteum? A) Transport Of Cholesterol To The Inner Mitochondrial Membrane By Steroidogenic Acute Regulatory Protein B) Conversion Of Pregnenolone To Progesterone By 3B-hydroxysteroid Dehydrogenase C) Conversion Of Cholesterol To Pregnenolone By P450 Side Chain …

Q1) Which of the following is the rate-limiting step inprogesterone synthesis by the corpus luteum?

a) transport of cholesterol to the inner mitochondrial membraneby steroidogenic acute regulatory protein

b) conversion of pregnenolone to progesterone by3B-hydroxysteroid dehydrogenase

c) conversion of cholesterol to pregnenolone by P450 side chaincleavage enzyme

d) uptake of cholesterol from plasma

e) synthesis of cholesterol from acetate

Q2) Which of the following is the CORRECT pairing ofhypothalamic releasing factor and anterior pituitary glandhormone?

a) Dopamine and prolactin

b) corticotrophin releasing factor and adrenocorticotrophichormone

c) growth hormone-releasing hormone and thyroid stimulatinghormone

d) Corticotrophin releasing factor of vasopressin

e) Gonadotrophin releasing hormone and thryotrophins

Q3) Which of the following statements is CORRECt in relation tothe posterior pituitary hormones oxytocin and vasopressin ?

a) Oxytocin and vasopressin are secreted by the large bodiedneurons of the hypothalamus and released into the medianeminence

b) Oxytocin and vasopressin are expressed in both the supraopticand periventricular nuclei of the hypothalamus

c) Oxytocin and vasopressin bind to steroid receptors in theirtarget cells for biological action

d) Oxytocin and vasopressin are secreted by the small bodiedneurons of the hypothalamus and released into the posteriorpituitary

e) A single hypothalamic neuron that produces oxytocin is alsocapable of producing vasopressin

Q4)Which of the following statements about oxytocin secretionduring lactation is CORRECT?

a) Plasma oxytocin levels increase about 30 mins after the teatis stimuatled by the sucking stimulus

b) The main source of oxytocin is the uterus

c) Auditory, visual and olfactory stimuli are unable tostimulate oxytocin secretion

d) Plasma oxytocin levels increase within a few minutes of thenipple being stimualted

e) Plasma oxytocin levels begin to increase at the time ofparturition and remain elevated until the end of lactation