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Endocrine > Physiology > Flashcards

Physiology Flashcards

1
Q

The endocrine system involves ducts. True/False?

A

False
It is a ductless system involving glands that secrete directly into blood

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2
Q

How is specificity of signalling by endocrine glands achieved?

A

Chemically distinct hormones
Specific hormone receptors
Distinct distribution of receptors

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3
Q

List the main endocrine glands of the body

A

Cranial cavity:
Hypothalamus
Pituitary glands

Neck:
Four Parathyroid glands
Thyroid

Abdomen:
Two Adrenal glands
Pancreas

Pelvis:
Placenta
Ovaries/testes

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4
Q

What is meant by an autocrine gland?

A

Hormone released acts back on the structure that released it

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5
Q

What is meant by a paracrine gland?

A

Hormone released acts on neighbouring structures

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6
Q

List the 3 main classes of hormones

A

Glycoproteins + peptides
Steroids
Tyrosine derivatives

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7
Q

Give an example of glycoprotein/peptide hormones

A

Insulin
Growth hormone
Oxytocin
Prolactin

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8
Q

Give an example of a steroid hormone

A

Cortisol
Testosterone

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9
Q

Give an example of a tyrosine-derivative hormone

A

Adrenaline
Thyroid hormone
Melatonin

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10
Q

A whole protein is always required to achieve hormonal effect. True/False?

A

False
Protein can be cleaved into active hormonal units

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11
Q

On a basic level, how are amines, peptides and proteins released from the endocrine cell?

A

Synthesised, packaged into vesicles and then released in response to stimuli via exocytosis

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12
Q

On a basic level, how are steroid hormones released from the endocrine cell?

A

Synthesised upon demand, then stimuli increases cellular uptake and availability of cholesterol + rate of conversion into pregnenolone, which is then used to build steroid to be released

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13
Q

Steroid hormones travel freely in blood. True/False?

A

False
Usually has carrier protein in inactive form

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14
Q

Which carrier protein binds cortisol?

A

Cortisol-binding protein! FANCY THAT

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15
Q

Which carrier protein binds thyroxine (T4)?

A

Thyroxine-binding globulin

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16
Q

Which hormones normally bind to sex steroid-binding globulin?

A

Testosterone
Estradiol

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17
Q

Free and bound lipophilic hormone are in equilibrium in the blood. True/False?

A

True

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18
Q

What does “tropic” mean with regards to hormones?

A

Refers to a hormone that acts upon another endocrine gland to regulation secretion of hormone

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19
Q

What are the biggest players in elimination of hormone?

A

Liver
Kidney

20
Q

Time taken to reach half life of amine hormones is achieved in seconds/minutes/hours

A

Seconds

21
Q

Time taken to reach half life of protein hormones is achieved in seconds/minutes/hours

A

Minutes

22
Q

Time taken to reach half life of steroid hormones is achieved in seconds/minutes/hours

A

Hours

23
Q

List the 3 main distinct types of hormone receptor

A

GPCR
Receptor kinases
Nuclear receptors

24
Q

Which of the 3 main types of hormone receptor are cell surface receptors?

A

GPCR
Receptor kinases

25
Q

Which of the 3 main types of hormone receptor are intracellular receptors?

A

Nuclear kinases

26
Q

Describe class 1 nuclear receptors

A

Activate by steroid hormones
Usually in cytoplasm bound to heat-shock-proteins

27
Q

Describe class 2 nuclear receptors

A

Activate by lipids
Present in nucleus

28
Q

Describe the hybrid class of nuclear receptors

A

Activated by T3
Similar function to class 1

29
Q

Give an example of a hormone that utilises signalling via receptor kinases

A

Insulin

30
Q

What are the 3 main components of the hypothalamic pituitary axis?

A

HYPOTHALAMUS influences PITUITARY to secrete hormones to act on PERIPHERAL GLAND (thyroid, adrenal etc.)

31
Q

List the main hormones secreted by the anterior pituitary

A

GH
LH/FSH
ACTH
TSH
Prolactin

32
Q

List the main hormones secreted by the posterior pituitary

A

ADH
Oxytocin

33
Q

What is the effect of peripheral hormones secreted by target glands (thyroid, adrenals etc.) upon the pituitary and hypothalamus?

A

Negative feedback loop (inhibition)

34
Q

List the factors that influence our ability to measure hormone levels

A

Pattern of secretion
Presence of carrier proteins
Interfering agents
Stability/half-life
Absolute concn

35
Q

What is the major determination of hormone concentration?

A

Rate of secretion

36
Q

Outline the thyroid hormone axis

A

Hypothalamus secretes TRH which stimulates anterior pituitary to stimulate TSH which stimulates thyroid to produce thyroid hormones

37
Q

Thyroid hormones inhibit the thyroid, anterior pituitary and hypothalamus to reduce further thyroid hormone release. True/False?

A

False
They do not inhibit the thyroid gland!

38
Q

What test is done to evaluate thyroid hormone?

A

Highly-sensitive TSH assay

39
Q

Outline the hypothalamic-pituitary-adrenal axis (HPA axis)

A

HYPOTHALAMUS releases CRH to stimulate ANTERIOR PITUITARY to release ACTH which stimulates ADRENALS to release cortisol

40
Q

Which parts of the HPA axis does cortisol inhibit via negative feedback loop?

A

Anterior pituitary
Hypothalamus

41
Q

Random cortisol measurement is useful in determining cortisol levels. True/False?

A

False
Circadian rhythm means levels will vary widely throughout the day

42
Q

GH stimulates the liver to produce what hormone?

A

IGF-1

43
Q

Which cells secrete prolactin?

A

Lactotroph cells in the anterior pituitary

44
Q

Which hypothalamic hormone inhibits release of prolactin?

A

Dopamine

45
Q

What is the rate-limiting step in steroid hormone metabolism?

A

Cholesterol to pregnenolone

Endocrine (28 decks)

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