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Endocrine System > Overview > Flashcards

Flashcards in Overview Deck (14):
1

Endocrine system definition

A system of ductless glands found throughout the body high secrete hormones

2

Endocrine system affects

Reproduction
Conception, pregnancy, birth, lactation
Metabolism
Growth, development, puberty
Sleeping/walking (biological clock)
Stress response
Aging

3

Endocrine glands

Organs who's sole purpose is to produce hormones
E.g pituitary and thyroid glands

4

Endocrine tissue

In organs which have other functions
E.g pancreas and hypothalamus

5

Small pockets and endocrine cells

These are found in other organs such as the kidney & heart and enteroendocrine cells of the stomach and intestine

6

Which function secrete hormones but are not endocrine glands:

Intestine
Liver
Kidney
Heart

7

What are exocrine glands

Produce non-hormonal substances, and have dust to carry these to the membrane surface.

8

All endocrine glands - too to bottom

Pineal gland
Hypothalamus gland
Pituitary gland
Thyroid gland
Parathyroid glands
Thymus
Adrenal glands
Pancreas
Ovary/testis

9

Hormones - function

Steroid or amino acid based molecules released into the blood, which act as chemical messenger to regulate specific body functions.

10

What can hormones do

Hormones have the ability to alter the function of other cells in the body but....while a hormone reaches all parts of the body , it will only act upon cells with a specific receptor - "target cells"

11

Hormones action on target cells includes

- altered plasma membrane ermeability
- stimulate protein synthesis
- activate or deactivate enzyme systems
- induce secretion of other substances
- stimulate cell division

12

The main types of hormones are

-Protein &a peptide hormones (insulin)
-Amino acid derivatives from tyrosine (epinephrine, Norepinephrine)
-steroid hormones ( estrogen, testosterone)

13

Water soluble hormones:

- all protein and AA-based hormones
- can't enter the target cell
- act in plasma membrane receptors

14

Lipid soluble hormones:

-Steroid and thyroid hormones
- can't pass through the plasma membrane
- act directly on intercellular receptors to activate genes