is confusion in understanding of organs and organ systems.
larynx, trachea, bronchi, pleurae, lungs, mouth, fauces,
pharynx, esophagus, abdomen, stomach, intestines small and large, liver,
pancreas, kidneys, ureters, urinary bladder, various glands, reproductive
organs, organs related to our senses, other organs related to brain & nerves,
Organ systems are
Circulatory systems (Cardiovascular system for blood, and the
Lymphatic system), Digestive system, Endocrine system (communication within
body), excretory system (fluid and electrolyte balance – urinary system), Nervous
system (collection and transfer and processing of information), immune system (defence
against diseases), muscular system, Integumentary system(skin, hair, breasts),
reproductive system, respiratory system, skeletal system
Organs involved are the stomach,
intestines, pancreas, hypothalamus in the brain, ...
involved are Digestive system, Endocrine system, Nervous
system, Circulatory system.
Our body and system feels the urge and need to eat food. This
sensation is called hunger.
Digestive system maintains the sugar
levels in the blood. When the level falls below a certain threshold (or
when stomach is empty), a harmone Ghrelin is secreted in the stomach. Ghrelin
is also called the hunger harmone. It is produced in gastro-intestinal
tract. After eating food, the stomach gets stretched the ghrelin secretion
stops. Ghrelin acts on the hypothalamic brain cells of our central nervous
After about half a day of digestion of food, the stomach muscles start
to contract and cause pain. These are called hunger pangs.