Arthropods II: Metamorphosis Hormones Flashcards Preview

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Flashcards in Arthropods II: Metamorphosis Hormones Deck (64)
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31

Wigglesworth's experiment using

Rhonidus porlixus

32

Rhonidus prolixus

a blood sucking insect moults after blood meal

33

Hormones are secreated by

endocrine cells

34

Hormones are distrubted by the ____ and bind to ___ ____ _____

blood; target cell receptors

35

some chemical signals act locally meaning they can...

act without entering the blood stream

36

How do hormones work?

1. affect the expression of a gene
2. alternate the activity of an existing enzyme
3. change the permeability of a cell membrane

37

what are the three chemical families of hormones

1. peptides and polypeptides
2. amino acid derivatives
3. steroids

38

what is the hormone involved in Arthropod moulting?

PTTH: ProThoracicoTropic Hormone

39

where is PPTH produced and stored?

in the brain

40

PTTH controls the activity of what gland?

prothoracic gland

41

What does the prothoracic gland produce?

Ecdysone

42

Where is the ecdysone secreted?

into the blood

43

What cells does the ecdysone targe?

epidermis

44

what releases ecdysone?

corpus allatum

45

what determines when its time to moult?

pulses in the brain

46

What are the two body control systems?

endocrine system and nervous system

47

What is the endocrine system?

- hormones
- diffuse via blood
- slower, longer term

48

What is the nervous system?

- action potentials
- electrical signals along neurons
- quicker: shorter term

49

what happens when both systems work together?

- neurons trigger hormone release
- neurons in hypothalamus make hormones released by the posterior pituitary gland
- hormones feed back onto nervous system

50

what are the responses of nervous and endocrine system to stimuli?

1. brain detects danger and signals an action
2. brain signals adrenal gland to release epinephrin
3 epinephrine causes:
- the liver to convert clycogen to glucose
- the heart to beat faster
- Blood vessels to gut and skin to constricut - shunting more blood to muscles
- fat cells release fatty acids (fuel) into blood

51

The Hypothalamus integrates ...

information about the state of the body

52

ADH stands for

anti-diuretic hormone

53

what triggers ADH?

Increased salt concentration in the blood

54

what is the function of ADH?

water is conserved and urine is more conentrated

55

what does ADH target?

kidneys

56

what does ADH do?

Increases the absorption of water

57

Eating a bag of chips

- Sodium levels go up
- body tries to flush out some of the Na (this requires water)
- body loses water
- if you lose too much you'll shrivel up
- hypothalamus releases hormone to the kidney so it reabsorbs the water so you don't shrivel up

58

Oxytocin's 1st targe

the smooth muscle of the uterus

59

First action of Oxytocin

contractions

60

2nd target of oxytocin

mammary glands - milk is released