Endocrine System
Hormones may produce their action by several mechanisms. Which of the following is one such mechanism?
By stimulating the synthesis of a structural protein in the cell cytoplasm
By detecting the concentration level of a substance in the blood
By causing a nerve impulse to be sent to the brain
By stimulating a reflex muscle contraction
By stimulating the synthesis of a structural protein in the cell cytoplasm
Steroid hormones may diffuse into the cell to bind to receptors that activate a gene to synthesise a specific protein.
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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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