sistema endocrino

Endocrine system

“Hormones will rock your world”

WHAT IS IT?

Group of organs and tissues that control and regulate the metabolic functions of the body by using chemical substances called hormones.

HORMONES

• Chemical substances produced by specialized cells.

• They act as chemical messengers.

• Direct release into the blood stream:• Alone • Associeated

• 2 types of action:• Autocrine • Paracrine

GLANDULES

• Organs or tissues that secrete hormones.

• Secrete substances for an action on a distant target or over themselves.

CHARACTERISTICS

Act over the heart.

Release in extracellular space.

Diffuse into blood vessels and travel throught the blood stream.

Affect tissues that can far away from the point of origin of the hormone.

Its effect is directly proportional to its concentration.

Regulate how the body works.

Independently of the concentration, its function is related to the correct response of the receptor.

EFFECTS

Stimulant:Promotes activity in a

tissue ( eg, prolactine).

Inhibitant:Decreases activity in a

tissue (eg, somatostatine).

Antagonist:

When a couple of hormones have opposite effects

(eg, insuline & glucagon)

Sinergist:

When a couple of hormones produce a

more powerful reaction than when they are separated (eg HGH & T3/T4)

Tropic:

This hormone affects the tissue of an

specific glandule, (eg, gonadotropine wo

rks as chemical messenger).

GLÁNDULAS Y HORMONAS