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The arrow shows the direction of the nerve impulse in a neuron. Part X would represent an) The arrow shows the direction of the nerve impulse in a neuron. Part X would represent an)    A)  axon. B)  dendrite. C)  cell body. D)  myelin sheath. E)  axon terminal.


A) axon.
B) dendrite.
C) cell body.
D) myelin sheath.
E) axon terminal.

F) B) and D)
G) C) and D)

Correct Answer

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Which part of a neuron could be covered with a myelin sheath?


A) nucleus
B) axon
C) dendrite
D) cell body
E) terminal

F) A) and B)
G) A) and E)

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If an individual's pancreatic islets have been destroyed, the result will be


A) Cushing syndrome.
B) Graves disease.
C) type 2 diabetes mellitus.
D) Addison disease.
E) type 1 diabetes mellitus.

F) B) and E)
G) A) and B)

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Which action is not part of how drugs can affect the nervous system?


A) Drugs can enhance the release of a neurotransmitter.
B) Drugs can block the release of a neurotransmitter.
C) Drugs can block the receptor for a neurotransmitter.
D) Drugs can mimic the actions of a neurotransmitter.
E) All of these actions are part of how drugs can affect the nervous system.

F) A) and B)
G) B) and D)

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Only the glands of the endocrine system


A) use chemical signals to bring about changes in target organs.
B) work to regulate the activities of other body systems.
C) use the bloodstream to convey signals throughout the body.
D) help to maintain homeostasis.
E) bring about rapid responses by target organs.

F) B) and C)
G) A) and B)

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The spinal cord's gray matter is located


A) on the outside, surrounding a central core of white matter.
B) on the inside, surrounding the central canal.
C) on both the inside and the outside.
D) neither inside nor outside- the spinal cord is entirely white matter.
E) scattered among a collection of ganglia.

F) B) and D)
G) A) and B)

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If you do not obtain enough iodine in your diet, you will likely develop


A) pituitary gigantism.
B) simple goiter.
C) exophthalmos.
D) diabetes mellitus.
E) tetany.

F) A) and B)
G) B) and C)

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Which type of neuron is completely contained within the central nervous system?


A) sensory neuron
B) motor neuron
C) autonomic neuron
D) interneuron
E) sympathetic neuron

F) A) and D)
G) A) and B)

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When the sympathetic division of the autonomic nervous system is activated, its effects can be prolonged by secretions of the


A) adrenal cortex.
B) thyroid gland.
C) parathyroid glands.
D) adrenal medulla.
E) posterior pituitary.

F) B) and E)
G) All of the above

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Transmission across the synaptic cleft is accomplished by chemical signals called


A) hormones.
B) exocrine secretions.
C) enzymes.
D) stimulants.
E) neurotransmitters.

F) B) and D)
G) B) and C)

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Which two anterior pituitary hormones do not target other endocrine glands?


A) prolactin PRL) and growth hormone GH)
B) oxytocin and prolactin PRL)
C) adrenocorticotropic hormone ACTH) and growth hormone GH)
D) luteinizing hormone LH) and adrenocorticotropic hormone ACTH)
E) antidiuretic hormone ADH) and oxytocin

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

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Contraction of the uterus during childbirth is stimulated by


A) prolactin.
B) luteinizing hormone LH) .
C) oxytocin.
D) glucagon.
E) parathyroid hormone PTH) .

F) B) and D)
G) D) and E)

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Which is not an anterior pituitary hormone?


A) thyroid-stimulating hormone TSH)
B) prolactin PRL)
C) growth hormone GH)
D) adrenocorticotropic hormone ACTH)
E) antidiuretic hormone ADH)

F) A) and B)
G) A) and C)

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_____ hormones can pass through the plasma membrane of a target cell.


A) Second messenger
B) Steroid
C) First messenger
D) Peptide
E) DNA

F) A) and E)
G) C) and E)

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Gigantism can result from excessive secretion from the


A) posterior pituitary.
B) anterior pituitary.
C) adrenal medulla.
D) adrenal cortex.
E) pancreas.

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

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The hormone _____ lowers blood glucose, while the hormone _____ raises blood glucose.


A) insulin; glucagon
B) epinephrine; norepinephrine
C) cortisol; insulin
D) thyroxine; glucagon
E) glucagon; insulin

F) A) and B)
G) D) and E)

Correct Answer

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Which of these is not part of a neuron?


A) dendrite
B) nucleus
C) cell body
D) axon
E) synapse

F) B) and D)
G) A) and C)

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The exophthalmos seen in Graves disease results from hypersecretion of the


A) thyroid gland.
B) parathyroid glands.
C) posterior pituitary.
D) adrenal cortex.
E) pancreas.

F) A) and E)
G) B) and D)

Correct Answer

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Which hormone stimulates milk letdown?


A) prolactin PRL)
B) luteinizing hormone LH)
C) oxytocin
D) follicle-stimulating hormone FSH)
E) estrogen

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

Correct Answer

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The hormonal secretions) of the _____ serve to increase the body's metabolic rate.


A) thyroid gland
B) adrenal medulla
C) adrenal cortex
D) posterior pituitary
E) parathyroid glands

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

Correct Answer

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