ENDOCRINE SYSTEM

ENDOCRINE SYSTEM

•The endocrine system : is responsible for chemical coordination and regulates activities that take place inside the body 

HYPOTHALAMUS

•Secretes hormone : ADH 

•Function : Controls the Concentration of water in the blood.

 THYROID GLAND 

•Secretes hormone : Thyroxin

Function : Controls basal metabolic rate

ADRENAL GLAND

•Secretes hormone : Adrenalin

•increases : heartbeat , blood pressure & skeletal muscle tone 

•Decreases : blood flow to the digestive system and skin 

ALDOSTERONE 

•Function : Regulates salt concentration In the blood.

 PITUITARY GLAND 

 (hypophysis)

•Secretes hormone :  

GH (growth hormone) ,TSH(thyroid stimulating hormone)

Function : Controls growth 

🧠TSH(stimulates thyroid gland to secrete Thyroxin)

Reproductive hormones : 

•FSH : stimulates the development of follicle in the ovaries

•FH : Stimulates ovulation

•Prolactin : Stimulates the mammary glands to secrete milk

PANCREAS : 

Also Called islets of langerhans 

Secrets hormone : Glucagon : Stimulates conversion of glycogen to glucose

•Secrets hormone : Insulin : stimulates the conversion of glucose to glycogen

TESTES 

•Secrets  hormone : Testosterone

Functions :  

•Stimulates puberty in males

•Stimulates the maturation of sperm cells

OVARIES 

1)  Harmones Secretion:

  Oestrogen & Progesterone

•Function : oestrogen : Stimulates puberty in females

•Functions : Progesterone :  Maintains pregnancy

THE PROCESS OF TEMPERATURE REGULATION 

•Temperature regulation as control of the body as close to 37 degrees Celsius as possible to enable the body to function normally

Vasodilation : 

On a hot day : 🏜

•the hypothalamus is stimulated

•more sweat is released

•sweat glands becomes more active

•blood vessels dilate it means that they become 'wider'

•more blood flows into the skin

 

Vasoconstriction : 

on a cold day : ☃️

•the hypothalamus is stimulated

•less sweat is released

•Sweat glands becomes less active 

•Blood vessels constrict it means that they become 'narrower'

•less blood flows into the skin