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Which of these circumstances is the cause of too little activity of a particular hormone?


A) an abnormality within the endocrine gland that produces this hormone
B) overactivity of this hormone's tropic hormone
C) overstimulation by the hypothalamus
D) overstimulation of the pituitary gland

E) C) and D)
F) B) and C)

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Melatonin is secreted by the ____________________.

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Peptide hormones are often produced as prohormones.

A) True
B) False

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Transmission of nerve impulses from the hypothalamus to the anterior pituitary causes the stored hormones to be released.

A) True
B) False

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Which of the following statements correctly describes hypophysiotropic hormones from the hypothalamus?


A) They control the release of oxytocin and vasopressin from the posterior pituitary.
B) They travel via neuron axons from the hypothalamus to the anterior pituitary.
C) They are carried in the hypothalamic-hypophyseal portal system.
D) They are released upon positive-feedback stimulation via the anterior pituitary tropic hormones.

E) A) and C)
F) C) and D)

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The hypothalamus synthesizes and regulates the release of hormones from the posterior pituitary.

A) True
B) False

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Which of the following statements applies correctly to circadian rhythms?


A) The hypothalamus's supraoptic nucleus maintains them.
B) Melanin is responsible for generating them.
C) They are brought about by fluctuating levels of clock proteins.
D) The pituitary gland maintains them.

E) C) and D)
F) A) and B)

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Which of the following statements correctly describes hormones?


A) All are regulated by the hypothalamus.
B) They are secreted by endocrine glands through ducts into the blood.
C) They must combine with specific receptors on their target cells in order to exert their effects.
D) They are produced in a gland and act on the target cells in different tissues.

E) A) and B)
F) None of the above

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Which of the following statements correctly describes the anterior pituitary?


A) It is also known as the neurohypophysis.
B) It is composed primarily of nervous tissue.
C) It primarily secretes tropic hormones.
D) It secretes vasopressin

E) B) and D)
F) None of the above

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In males, luteinizing hormone can be called ____________________, reflecting its function in stimulating the cells of Leydig.

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interstiti...

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Which characteristic is NOT shared by both lipophilic and hydrophilic hormones?


A) amplification of hormone actions in the target cell
B) passing through the lipid membrane barriers of their target cells
C) synergistic actions
D) antagonistic actions

E) C) and D)
F) None of the above

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Growth hormone is the only hormone that influences growth.

A) True
B) False

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An anterior pituitary gland produces inhibiting and stimulating signals that affect the hypothalamus.

A) True
B) False

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Neurohormones are hormones that specifically modify neural activity.

A) True
B) False

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Which of the following statements correctly describes growth hormone?


A) It closes the epiphyseal plate of long bones.
B) It promotes hypertrophy and hyperplasia.
C) Its secretion is stimulated by an increased blood glucose level.
D) It is the only factor responsible for governing the growth of an individual.

E) B) and D)
F) None of the above

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Match posterior and anterior pituitary, labelled a. through c., with their features. (Options may be used more than once or not at all.) a. applies to the posterior pituitary b. applies to the anterior pituitary c. applies to both the posterior and the anterior pituitary -stores hormones synthesized by the hypothalamus

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Compare and contrast the receptor and postreceptor events for lipophilic and hydrophilic hormones.

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The ____________________hormones are derived from tyrosine.

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Match the systems, labelled a. through c. with their characteristics. (Options may be used more than once or not at all.) a.the endocrine system b.the nervous system c.both the endocrine and nervous systems -Chemical messengers act at a long distance from their site of secretion.

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The ____________________ and ____________________ nuclei in the hypothalamus produce vasopressin and oxytocin.

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supraoptic; paravent...

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