Endocrine System
Complete the sentence correctly. Parathyroid hormone:
Is produced by the parafollicular cells of the thyroid gland
Decreases the concentration of Ca++ in the blood
Releases Ca++ from the sarcoplasmic reticulum
Increases the concentration of Ca++ in the blood
Increases the concentration of Ca++ in the blood
When the level of calcium in the blood is lower than required, PTH is released and causes the calcium concentration to increase.
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Which statement is NOT CORRECT?A. Males and females produce testosterone and estrogen, respectively, in their gonads.
B. Both male and females produce follicle stimulating hormone and luteiniz-ing hormone.
C. Oxytocin is produced and released from the anterior lobe of the pituitary gland.
D. Production of testosterone and estrogen inhibits the release of gonadotrophin- releasing hormone from the hypothalamus.
Which of the following is an amino acid derivative hormone?
A. Epinephrine
B. Tyrosine
C. Testosterone
D. Prostaglandin
Which of the following statements about endocrine hormones is always true?
A. They are secreted by neurones.
B. They are derived from amino acids.
C. They are produced by exocrine glands.
D. They are released into the bloodstream.
Which hormones are produced by the adrenal cortex and contribute to carbohydrate metabolism?
A. Androgens
B. Mineralocorticoids
C. Glucocorticoids
D. Gonadocorticoids
Which of the following is NOT a mechanism of hormone action?
A. A hormone may activate an enzyme.
B. A hormone may bind to a protein to alter the permeability of the plasma membrane.
C. A hormone may bind to troponin to expose the binding site the myosin cross-bridge.
D. A hormone may enter the cell to stimulate cell mitosis.
Which statement below about hormones is true?
A. Hormones are enzymes that catalyse reactions.
B. Hormones are released into the blood circulation.
C. Hormones affect all cells of the body.
D. Hormones are released by neurones at synapses.
Which of the following lists of organs and hormones involved in a control process that releases that hormone is WRONG?
A. Hypothalamus, anterior pituitary, thyroid-stimulating hormone
B. Hypothalamus, posterior pituitary, antidiuretic hormone
C. Hypothalamus, adrenal medulla, epinephrine
D. Thalamus, hypothalamus, oxytocin
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