16. Hormones Flashcards Preview

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Flashcards in 16. Hormones Deck (14):
0

Hormondes are distributed by ...., bind to ....

Blood
Target cell receptors (target specificity depends on receptor equipment of cells)

1

Two examples of chemical signals that act locally, without entering blood stream?

Autocrine (acts on same cell that secretes them)
Paracrine (acts on neighbouring cells)

2

Three main chemical families of hormones?

1. Peptides and polypeptides (not lipid soluble)
2. Amino acid derivatives (most no lipid soluble)
3. Steroids (lipid soluble)

3

What is PTTH?

(Prothoracicotropic hormone) Brain hormone, peptide
- Stored/produced by brian
- Production influenced by environmental cues
- Controls activity of prothoracic gland

4

What is ecdysone?

Steroid
- Produced by prothoracic gland
- Secreted into hemolymph
- Epidermis is target cells
- Response = ecdysis
- Brain responds by shutting off PTTH hormone (negative feedback)

5

2 hormones related to moulting in arthropods&

- PTTH
-ECDYSONE

6

PTTH triggers periodic release of .... which ....

Ecdysone
Triggers moulting

7

Declining release of ..... influences developmental stages of metamorphosis

Juvenile hormone

8

Ways the nervous and endocrine systems work together

1. Neurons trigger hormone release (neurons in hypothalamus makes hormones released by posterior pituitary gland)
2. Hormones feedback onto nervous systems

9

Epinephrine causes...

1) Liver to convert glycogen to glucose
2) Heart to beat faster
3) Blood vessels to gut and skin to constrict, shunting more blood to muscles
4) Fat cells to release fatty acids (fuel) into blood

10

ADH (anti-diuretic hormone)
- Trigger
- Function
-Target
- Action

Trigger: increased salt concentration in bloods
Function: water is conserved & urine more concentrated
Targets: Kidneys
Action: increase reabsorption of water

11

Oxytocin
- Target 1
- Action 1
- Target 2
- Action 2

1: smooth muscle of uterus, contractions
2: mammary glands, milk release

12

Hormones act by...

1. Affecting expression of gene
2. Altering activity of existing gene
3. Changing permeability of cell membrane

13

Oxytocin is produced in the.... and released form the ....

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