Summary The Endocrine System

What is the difference between exocrine glands and endocrine glands

Antwort: Exocrine Glands are glands that have ducts. ie Salivary glands, sweat glands Endocrine Glands are glands which secrete hormones. They do not have ducts. Ie thyroid gland; adrenal gland.

What is a hormone and what do they do

Antwort: Hormones are organic chemical messengers which are mostly protein in nature. They are secreted into the blood. They form an integrated system allowing coordination and homoeostasis as well as control functions like growth or reproduction

What is a target organ

Antwort: An organ stimulated by a hormone

What is homeostasis

Antwort: finding balance or equilibrium

what is coordination

Antwort: The linking together of all bodily activities for effective and harmonious functioning of an organism as a whole

What are the two systems which are responsible for coordination in the body

Antwort: the nervous system and the endocrine system

What are the differences between nervous and chemical messages

Antwort: NERVOUS The message is carried as an impulse It\'s travels fast It is carried along by nerves The message acts for short period of time It targets a specific area it causes an immediate reaction CHEMICAL The message is carried by a hormone It travels slowly It is carried by the blood The message acts for a long period of time It acts over a wide area It results in a long-term reaction which is delayed and prolonged

Where is the hypothalamus

Antwort: it is located on the underside of the brain

Explain how ADH helps bring about homeostasis

Antwort: WHEN THERE IS TOO LITTLE WATER ADH secreted in large amounts Increases permeability of the distal convoluted tubule and collecting tubule walls More water leaves the tubules into the medulla where it is reabsorbed by the blood capillaries Excessive water loss from blood is prevented WHEN THERE IS TOO MUCH WATER ADH secretion is decreased, the permeability of the walls decreases Less water leaves and the remaining water is lost with the urine Excess water is excreted

Where is the pituitary gland

Antwort: Located in a bony cavity at the base of the brain