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Endocrine System
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Endocrine System
What is one mechanism of hormone action?
They act as second messengers in the cytoplasm.
They act as enzymes for reactions.
They act as receptor proteins.
They activate genes in the nucleus.
Some hormones (corticosteroids) determine which genes are transcribed in the nucleus.
Author:
rikazzz
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Endocrine System
The adrenal medulla produces which of the following?
Weak androgens
Mineralocorticoids
Testosterone and estrogen
Epinephrine and norepinephrine
The adrenal cortex produces weak androgens and mineralocorticoids.
Author:
rikazzz
Comment
Endocrine System
What hormone(s) does the adrenal medulla produce?
Aldosterone
Epinephrine and norepinephrine
Corticosteroids
Glucocorticoids
Epinephrine and norepinephrine are produced in the adrenal medulla (the deep or inside part). Aldosterone is a mineralocorticoid, which like corticosteroids and glucocorticoids, as the “cortico” in the name suggests, are all produced in the adrenal cortex.
Author:
rikazzz
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Endocrine System
Iodine is an essential component of which hormone?
Thyroid hormones
Aldosterone
Thyroid-stimulating hormones
Parathyroid hormone
Thyroid hormones T3 and T4 contain three and four iodine atoms, respectively.
Author:
rikazzz
Comment
Endocrine System
Which two hormones are stored in the posterior pituitary prior to their release?
Luteinising hormone and follicle stimulating hormone
Adrenalin and noradrenalin
Calcitonin and calcitriol
Oxytocin and antidiuretic hormone
OT and ADH are produced in the hypothalamus before being transported to the posterior pituitary.
Author:
rikazzz
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Endocrine System
The structure that secretes regulatory hormones that control the pituitary gland is known as the:
Hypothalamus
Hypophysis
Hypothyroid
Hypothymus
Hypothalamus is structure. Hypophysis is another name for the pituitary gland.
Author:
rikazzz
Comment
Endocrine System
The posterior pituitary does which one of the following?
Produces growth hormone and prolactin and tropic hormones
Secretes regulatory hormones that control endocrine cells in the anterior pituitary
Exerts neural control over other endocrine glands
Stores and releases oxytocin and antidiuretic hormone
OT and ADH are made in hypothalamus and passed along neurones to the posterior pituitary.
Author:
rikazzz
Comment
Endocrine System
How do calcitonin or parathyroid hormone controls blood calcium levels?
Calcitonin acts to increase blood calcium levels.
Parathyroid hormone release is inhibited by increased calcium levels.
Parathyroid hormone stimulates bone-resorbing cells to take up calcium.
Calcitonin inhibits parathyroid hormone.
PTH acts to increase blood calcium levels. Hence less is required when blood calcium level is high.
Author:
rikazzz
Comment
Endocrine System
What may be correctly said about oxytocin and antidiuretic hormone?
They are made and released from the posterior pituitary.
They are made in the hypothalamus and stored and released from the posterior pituitary.
They are made in the hypothalamus and stored and released from the anterior pituitary.
They are made and released from the anterior pituitary.
The hypothalamus produces ADH and OT. The posterior pituitary releases them.
Author:
rikazzz
Comment
Endocrine System
Which statement is NOT CORRECT about hormones?
They are chemical substances that alter cell activity.
They regulate metabolic function of other cells in the body.
Steroid hormones are amino acid-based and are synthesised from cholesterol.
They are produced in glands and transported via the bloodstream.
Steroid hormones are not based on amino acids. They are lipids.
Author:
rikazzz
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