Endocrine System multiple choice
(ch.18)
The endocrine system....
A) directs long-term changes such as puberty and pregnancy.
B) involves glands that do not use ducts to transport their secretions.
C) regulates body activities through the production of hormones.
D) all of the above. - ANSWER-all of the above
The endocrine and nervous systems are similar in that....
A) they attempt to maintain homeostasis.
B) they release chemicals that bind to specific receptors on target cells.
C) they share many chemical messengers.
D) all of the above. - ANSWER-all of the above
Endocrine glands differ from exocrine glands in....
A) the length of their effect.
B) their means of transport.
C) that one has local effects and the other organismal effects.
D) all of the above. - ANSWER-their means of transport.
G-protein activation results in...
A) activation of phospholipase C, opening Ca channels.
B) activation of adenylate cyclase.
C) inhibition of adenylate cyclase and other cellular activities.
D) all of the above. - ANSWER-all of the above
Hormones alter cellular operations by...
A) modifying the rate of transcription of a particular enzyme.
B) stimulating the synthesis of a specific protein.
C) turning an existing enzyme on or off.
D) all of the above. - ANSWER-all of the above
The hypothalamus...
A) is the highest level of endocrine control.
B) integrates the activities of the endocrine and nervous systems.
C) secretes regulatory hormones.
D) all of the above. - ANSWER-all of the above
, The region of the pituitary that releases seven hormones controlling various other
endocrine organs and tissues is the ...
A) posterior pituitary.
B) infundibulum.
C) adenohypophysis.
D) pars nervosa. - ANSWER-adenohypophysis
Antidiuretic hormone (ADH) is synthesized in the hypothalamus and is released at
the ...
A) infundibulum.
B) anterior pituitary.
C) neurohypophysis.
D) pars intermedia. - ANSWER-neurohypophysis
Thyroxin is synthesized from the amino acid __________ and __________ ions. -
ANSWER-tyrosine, iodine
The physiologically active thyroid hormone is...
A) thyroxin.
B) prealbumin.
C) triiodotyrosine.
D) thyroglobulin. - ANSWER-triiodotyrosine
The primary physiological effect(s) of thyroid hormones are...
A) to slow down the metabolic rate of target cells.
B) to increase the metabolic rate of target cells.
C) to burn calories.
D) both b and c. - ANSWER-both b and c
Calcitonin...
A) is released from the thyroid gland.
B) inhibits osteoclasts, leading to reduced levels of calcium in body fluids.
C) has an effect antagonistic to that of parathormone (PTH).
D) all of the above. - ANSWER-all of the above
Parathyroid hormone ...
A) increases calcium ion concentrations in the blood.
B) inhibits osteoclasts.
C) stimulates osteoblasts.
D) decreases calcium absorption. - ANSWER-increases calcium ion concentrations
in the blood
The thymus gland ...
(ch.18)
The endocrine system....
A) directs long-term changes such as puberty and pregnancy.
B) involves glands that do not use ducts to transport their secretions.
C) regulates body activities through the production of hormones.
D) all of the above. - ANSWER-all of the above
The endocrine and nervous systems are similar in that....
A) they attempt to maintain homeostasis.
B) they release chemicals that bind to specific receptors on target cells.
C) they share many chemical messengers.
D) all of the above. - ANSWER-all of the above
Endocrine glands differ from exocrine glands in....
A) the length of their effect.
B) their means of transport.
C) that one has local effects and the other organismal effects.
D) all of the above. - ANSWER-their means of transport.
G-protein activation results in...
A) activation of phospholipase C, opening Ca channels.
B) activation of adenylate cyclase.
C) inhibition of adenylate cyclase and other cellular activities.
D) all of the above. - ANSWER-all of the above
Hormones alter cellular operations by...
A) modifying the rate of transcription of a particular enzyme.
B) stimulating the synthesis of a specific protein.
C) turning an existing enzyme on or off.
D) all of the above. - ANSWER-all of the above
The hypothalamus...
A) is the highest level of endocrine control.
B) integrates the activities of the endocrine and nervous systems.
C) secretes regulatory hormones.
D) all of the above. - ANSWER-all of the above
, The region of the pituitary that releases seven hormones controlling various other
endocrine organs and tissues is the ...
A) posterior pituitary.
B) infundibulum.
C) adenohypophysis.
D) pars nervosa. - ANSWER-adenohypophysis
Antidiuretic hormone (ADH) is synthesized in the hypothalamus and is released at
the ...
A) infundibulum.
B) anterior pituitary.
C) neurohypophysis.
D) pars intermedia. - ANSWER-neurohypophysis
Thyroxin is synthesized from the amino acid __________ and __________ ions. -
ANSWER-tyrosine, iodine
The physiologically active thyroid hormone is...
A) thyroxin.
B) prealbumin.
C) triiodotyrosine.
D) thyroglobulin. - ANSWER-triiodotyrosine
The primary physiological effect(s) of thyroid hormones are...
A) to slow down the metabolic rate of target cells.
B) to increase the metabolic rate of target cells.
C) to burn calories.
D) both b and c. - ANSWER-both b and c
Calcitonin...
A) is released from the thyroid gland.
B) inhibits osteoclasts, leading to reduced levels of calcium in body fluids.
C) has an effect antagonistic to that of parathormone (PTH).
D) all of the above. - ANSWER-all of the above
Parathyroid hormone ...
A) increases calcium ion concentrations in the blood.
B) inhibits osteoclasts.
C) stimulates osteoblasts.
D) decreases calcium absorption. - ANSWER-increases calcium ion concentrations
in the blood
The thymus gland ...
