Endocrine system are one of two base system used for communication and regulation in human body

Molecule which secreted to extracellular liquid, circulate in blood or hemo-lymph and communicate the regulation message to all part of body

McGraw Hill, 2011

Adrenal glands are made up of two distinct part:

Produce hormones that are vital, such as Cortisol and

Aldosterone

Produce non-essentials hormon, such as adrenaline

Hypothalamus detects a drop in blood temperature

Hypothalamus stimulates pituitary to secrete TSH

Stimulates the thytoid to increase its secretion of

thyroxine

The process by which animals maintain internal temperature within a normal range.

All thermoregulation mechanisms are designed to return the body to homeostasis.

Endothermic are those animals or humans that warmed mostly by heat generated by metabolism

Ectothermic are those animals or humans that gain most of their heat from external sources

(a) A walrus, an endotherm (Campbell dkk., 2004)

(b) Lizard, an ectotherm(Campbell dkk., 2004)