Deck 10: The Endocrine System

Question 1

Structure A is the

A)pituitary gland.
B)hypothalamus.
C)pineal gland.
D)thymus.
E)thyroid gland.

Answer 1

B

Question 2

The endocrine system

A)releases neurotransmitters into the bloodstream for distribution throughout the body.
B)is regulated mainly by positive feedback.
C)produces effects that last for seconds or minutes.
D)is not involved in homeostasis.
E)relies on the release of chemicals that bind to target cells.

Answer 2

E

Question 3

Structure J is

A)adipose tissue.
B)the thyroid gland.
C)the pancreas.
D)the parathyroid gland.
E)the adrenal gland.

Answer 3

A

Question 4

The nervous system

A)is ideal for crisis management.
B)communicates mainly by the release of hormones.
C)has effects that are very long-lived.
D)is regulated mainly by positive feedback.
E)does not rely on the binding of receptors to target cells.

Question 5

Which statement is true regarding structure L?

A)This is the adrenal gland.
B)This organ is a major endocrine gland.
C)This organ makes no hormones.
D)The organ is labeled just because the adrenal gland sits upon it.
E)This organ has a secondary endocrine function.

Question 6

Structure F is the

A)pituitary gland.
B)hypothalamus.
C)pineal gland.
D)thymus.
E)thyroid gland.

Question 7

Structure G is the

A)pituitary gland.
B)parathyroid gland.
C)pineal gland.
D)thymus.
E)thyroid gland.

Question 8

Structure I is

A)the parathyroid gland.
B)adipose tissue.
C)the pancreas.
D)the adrenal gland.
E)the thymus.

Question 9

In the simplest case,endocrine activity may be controlled by changes in the extracellular fluid composition called ________ stimuli.

A)hormonal
B)cellular
C)neural
D)membrane
E)humoral

Question 10

The hormone leptin is secreted by (the)

A)pancreas.
B)kidneys.
C)adipose tissue.
D)hypothalamus.
E)anterior pituitary.

Question 11

Which statement is true regarding structure H?

A)This organ produces only one hormone.
B)This organ produces many hormones.
C)This organ is an important endocrine gland.
D)This organ is the thyroid gland.
E)This organ is the pancreas.

Question 12

Peptide hormones are

A)composed of chains of amino acids.
B)released by the reproductive organs.
C)derived from arachidonic acid.
D)lipids.
E)chemically related to cholesterol.

Question 13

Structure D is the

A)adrenal gland.
B)parathyroid gland.
C)ovary.
D)thymus gland.
E)thyroid gland.

Question 14

Structure C is the

A)pituitary gland.
B)hypothalamus.
C)pineal gland.
D)thymus.
E)thyroid gland.

Question 15

These organs labeled M produce hormones involved in

A)digestion.
B)respiration.
C)reproduction.
D)muscle contraction.
E)calcium absorption from blood.

Question 16

Structure E is the

A)adrenal gland.
B)parathyroid gland.
C)ovary.
D)stomach.
E)pancreas.

Question 17

Generally,the actions of hormones

A)tend to be less widespread than actions of the nervous system.
B)can produce complex changes in physical structure and physiological changes.
C)are faster to react than the nervous system.
D)are shorter-lasting than the actions of the nervous system.
E)do not affect homeostasis.

Question 18

Which statement is true regarding organ K or the organ system to which it belongs?

A)This organ is a major endocrine gland.
B)This organ is the pancreas.
C)This organ system makes only one hormone.
D)This organ belongs to the digestive system.
E)This organ system has both digestive and endocrine functions.

Question 19

Peripheral structures sensitive to the presence of hormones are called

A)exocrine cells.
B)first messengers.
C)target cells.
D)second messengers.
E)G-proteins.

Question 20

Structure B is the

A)pituitary gland.
B)hypothalamus.
C)pineal gland.
D)thymus.
E)thyroid gland.

Question 21

Which of the following primarily targets the gonads (ovaries and testes)?

A)growth hormone
B)follicle-stimulating hormone
C)prolactin
D)insulin
E)thyroxine

Question 22

The highest level of endocrine control is provided by the

A)thyroid gland.
B)pancreas.
C)suprarenal glands.
D)hypothalamus.
E)thymus.

Question 23

The hypothalamus transports hormones to the posterior pituitary by way of

A)neural axons,directly.
B)direct mechanical control.
C)releasing and inhibiting hormones.
D)altering ion concentrations in the anterior pituitary.
E)gap junctions.

Question 24

An important second messenger in hormonal action is

A)cAMP.
B)calcitriol.
C)insulin.
D)calcium.
E)glucagon.

Question 25

Which of the following hormones is an amino acid derivative?

A)ADH
B)melatonin
C)oxytocin
D)growth hormone
E)prolactin

Question 26

Which statement is true regarding steroid hormones?

A)They are carbohydrates.
B)They cannot diffuse through the plasma membrane.
C)They do not bind to receptors in the cytoplasm or nucleus.
D)They cannot change the nature or number of enzymes in the cytoplasm.
E)They can alter the rate of mRNA transcription.

Question 27

Target cells of hypothalamic releasing and inhibiting hormones are located in the

A)thymus gland.
B)suprarenal gland.
C)anterior pituitary.
D)posterior pituitary.
E)testes.

Question 28

Which of the following hormones bind to membrane receptors and activate G-proteins?

A)peptide hormones
B)steroid hormones
C)estrogen
D)thyroid hormones
E)cortisol

Question 29

The pituitary hormone that promotes testosterone release in males and ovulation in females is

A)TSH.
B)ACTH.
C)FSH.
D)LH.
E)GH.

Question 30

All hormones are

A)steroids.
B)cholesterol based.
C)proteins.
D)inorganic compounds.
E)chemical messengers.

Question 31

Hypothalamic hormones that stimulate the synthesis and secretion of one or more hormones in the anterior lobe are called

A)permissive hormones.
B)synergistic hormones.
C)regulating hormones.
D)stimulating hormones.
E)releasing hormones.

Question 32

The pituitary hormone that controls the release of glucocorticoids is

A)TSH.
B)ACTH.
C)FSH.
D)LH.
E)MSH.

Question 33

Hormones from the ________,which travel in the hypophyseal portal vessels,alter the activity of the anterior pituitary.

A)brain stem
B)hypothalamus
C)cerebellum
D)thyroid
E)thalamus

Question 34

Which of the following hormones enter a cell by diffusion?

A)steroid hormones
B)epinephrine and norepinephrine
C)amino acid derivatives
D)peptide hormones
E)oxytocin

Question 35

Cyclic AMP often causes activation of

A)calcium ion channels.
B)myosin kinase.
C)phosphodiesterase.
D)kinase enzymes.
E)steroids.

Question 36

When a protein or peptide hormone binds to receptors on the surface of a cell,

A)the hormone receptor complex moves into the cytoplasm.
B)the plasma membrane becomes depolarized.
C)a second messenger appears in the cytoplasm.
D)the cell becomes inactive.
E)the hormone is transported to the nucleus,where it alters the activity of the DNA.

Question 37

Steroid hormones

A)are proteins.
B)are structurally similar to cholesterol.
C)are the largest class of hormones.
D)include pancreatic hormones.
E)are secreted by the hypothalamus and pituitary gland.

Question 38

The posterior pituitary gland stores

A)follicle-stimulating hormone (FSH).
B)thyroid-stimulating hormone (TSH).
C)adrenocorticotropic hormone (ACTH).
D)oxytocin (OT).
E)melanocyte-stimulating hormone (MSH).

Question 39

Steroid hormones

A)bind to receptors on the surface of the cell.
B)function by way of a second messenger system.
C)cannot diffuse through the plasma membrane.
D)bind to intracellular receptors.
E)function by activating cAMP.

Question 40

Hormone concentration levels are most commonly controlled by

A)positive feedback.
B)the quantity of circulating hormone.
C)negative feedback.
D)cellular demands.
E)body temperature.

Question 41

The pituitary hormone that stimulates the breakdown of stored fats and the release of fatty acids into the bloods is

A)TSH.
B)ACTH.
C)MSH.
D)LH.
E)GH.

Question 42

Another name for antidiuretic hormone is

A)cortisol.
B)parathyroid hormone.
C)thymosin.
D)growth hormone.
E)vasopressin.

Question 43

Thyroid hormones are derived from the amino acid

A)lysine.
B)leucine.
C)glycine.
D)tyrosine.
E)thyronine.

Question 44

Hypothalamic signals reach the anterior pituitary through the

A)infundibulum.
B)hypophyseal portal system.
C)hypothalamic axons.
D)hypophysis.
E)thymus.

Question 45

Which statement regarding growth hormone (GH)is true?

A)GH stimulates the breakdown of stored fats and the release of fatty acids into the blood.
B)Liver cells respond to GH by releasing prostaglandins.
C)Skeletal muscle cells and chondrocytes are extremely insensitive to GH.
D)GH production is regulated by releasing and inhibiting hormones from the thyroid.
E)In epithelial tissues,GH inhibits stem cell division.

Question 46

Which endocrine gland stores its hormone in follicle cavities?

A)anterior pituitary
B)pancreas
C)thymus
D)thyroid
E)posterior pituitary

Question 47

Diabetes insipidus can be caused by

A)decreased levels of insulin.
B)decreased numbers of insulin receptors.
C)failure of the kidneys to respond to ADH.
D)increased numbers of ADH receptors.
E)increased levels of ADH.

Question 48

Where are the hormones secreted by the posterior pituitary made?

A)thyroid
B)anterior pituitary
C)hypothalamus
D)posterior pituitary
E)suprarenal gland

Question 49

Disorders associated with thyroid hormone excess have symptoms related to

A)weight loss.
B)weight gain.
C)diabetes.
D)slow heartbeat.
E)excess pigmentation of the skin.

Question 50

Excessive urine production,which is a characteristic symptom of all forms of diabetes,is known as

A)polyphagia.
B)polydipsia.
C)polyuria.
D)polymyositis.
E)diabetes mellitus.

Question 51

Unlike other hormones,T3 and T4 hormones require ________ for production.

A)iron
B)carbon
C)phosphorus
D)iodine
E)fluorine

Question 52

Which statement is true about the pituitary?

A)The anterior pituitary controls the posterior pituitary.
B)The alternate name for the pituitary is the infundibulum.
C)The hypothalamus communicates with the anterior pituitary only.
D)The pituitary hormones all work by activating G proteins and triggering cAMP within cells.
E)The pituitary glands,both anterior and posterior,control every other endocrine gland.

Question 53

This condition develops when the posterior pituitary no longer releases adequate amounts of ADH.

A)diabetes mellitus
B)diabetes insipidus
C)pituitary dwarfism
D)exophthalmos
E)gigantism

Question 54

The effect of prolactin closely interacts with the hormone

A)oxytocin.
B)renin.
C)ADH.
D)melatonin.
E)calcitonin.

Question 55

Which of the following is released by the posterior pituitary?

A)adrenocorticotropic hormone (ACTH)
B)thyroid-stimulating hormone (TSH)
C)growth hormone (GH)
D)antidiuretic hormone (ADH)
E)melanocyte-stimulating hormone (MSH)

Question 56

The hormone oxytocin

A)reduces uterine contractions.
B)is involved in the milk "letdown" reflex.
C)regulates blood pressure.
D)governs the ovarian cycle.
E)stimulates melanocytes in the skin.

Question 57

Triiodothyronine is a hormone secreted by the

A)thyroid gland.
B)pancreas.
C)parathyroid glands.
D)hypothalamus.
E)anterior pituitary.

Question 58

Hormones from which of the following glands are responsible for the calorigenic effect?

A)pituitary gland
B)suprarenal gland
C)parathyroid gland
D)thyroid gland
E)thymus

Question 59

Which of the following hormones is secreted by the human pituitary during fetal development in very young children and in pregnant women,but is not usually found in adults?

A)MSH
B)TSH
C)ACTH
D)LH
E)PRL

Question 60

Two hormones referred to as gonadotropins are

A)GH and TSH.
B)FSH and LH.
C)ADH and ACTH.
D)PRL and OT.
E)ADH and OT.

Question 61

Cells of the adrenal cortex produce

A)epinephrine.
B)ADH.
C)corticosteroids.
D)parathyroid hormone.
E)insulin.

Question 62

Which hormone is a very effective antioxidant,one that may protect CNS neurons from free radicals such as nitric oxide (NO)or hydrogen peroxide (H₂O₂)?

A)insulin
B)melanin
C)calcitonin
D)glucagon
E)melatonin

Question 63

Aldosterone is the principal

A)mineralocorticoid.
B)thyroid hormone.
C)glucocorticoid.
D)pancreatic hormone.
E)androgen.

Question 64

One adrenal hormone that affects glucose metabolism is

A)thymosin.
B)cortisol.
C)aldosterone.
D)epinephrine.
E)gonadotropin.

Question 65

The hormone that causes the activation of osteoclasts is

A)parathyroid hormone.
B)thyroid hormone.
C)calcitonin.
D)glucagon.
E)oxytocin.

Question 66

The target organs for the parathyroid hormone and calcitonin are

A)bone.
B)kidney.
C)digestive system.
D)kidneys,bone,and digestive system.
E)none of these.

Question 67

The hormone responsible for daily changes in physiological processes that follow a day-night pattern is

A)melanin.
B)thyroxine.
C)melatonin.
D)corticosteroid.
E)aldosterone.

Question 68

The hormone that inhibits osteoblasts is

A)insulin.
B)glucagon.
C)growth hormone.
D)parathyroid hormone.
E)thyroid hormone.

Question 69

Increased sodium ion concentrations in the body can be caused by which adrenal hormone?

A)cortisol
B)erythropoietin
C)thymosin
D)aldosterone
E)renin

Question 70

Which of the following is the pancreatic hormone that is released when blood glucose levels rise?

A)growth hormone
B)cortisol
C)insulin
D)glucagon
E)erythropoietin

Question 71

When blood glucose levels fall,

A)insulin is released.
B)glucagon is released.
C)skeletal muscle cells convert glucose into glycogen for storage.
D)protein synthesis increases.
E)fat cells increase their rates of triglyceride synthesis.

Question 72

Increased levels of the hormone ________ will lead to decreased levels of calcium ions in the blood.

A)thymosin
B)parathyroid hormone
C)calcitonin
D)aldosterone
E)cortisol

Question 73

The alpha cells of the pancreas produce

A)insulin.
B)glucagon.
C)rennin.
D)ADH.
E)parathyroid hormone.

Question 74

The release of parathyroid hormone is controlled by

A)thyroid hormone.
B)TSH.
C)the hypothalamus.
D)blood calcium ion levels.
E)cellular oxygen consumption.

Question 75

Marissa has had her entire thyroid gland removed because of a malignant tumor.She takes synthetic thyroid hormone to replace the thyroxine that her thyroid gland would have produced,but she is worried about her blood calcium.Does she need to worry about this problem?

A)No,the synthetic thyroid hormone will also control the calcium.
B)Possibly,it depends on whether the parathyroid glands were taken with the thyroid by accident.
C)No,hormones from the liver and kidneys will regulate calcium through the intestinal tract.
D)Yes,without the calcitonin,high blood levels of calcium will cause convulsions.
E)Yes,without the calcitonin she may suffer heart failure.

Question 76

Parathyroid hormone stimulates the kidneys to form

A)calcitriol.
B)renin.
C)ADH.
D)triiodothyronine.
E)calcitonin.

Question 77

One hormone that is released from the adrenal medulla is

A)insulin.
B)aldosterone.
C)cortisol.
D)androgen.
E)epinephrine.

Question 78

Which statement is true about the adrenal glands?

A)The adrenal cortex regulates the adrenal medulla.
B)The hormones of the adrenal cortex rely on control by the autonomic nervous system.
C)The adrenal cortex is most important in the control of sodium,potassium,and glucose blood levels.
D)The adrenal androgen hormones are found only in males.
E)The main hormone of the adrenal medulla is norepinephrine.

Question 79

The outer zone of the adrenal cortex produces

A)androgens.
B)glucocorticoids.
C)epinephrine.
D)mineralocorticoids.
E)steroids.

Question 80

Melatonin is the hormone produced by the

A)anterior pituitary.
B)thyroid.
C)pineal gland.
D)thymus.
E)posterior pituitary.