Endocrine+System

(Kidshealth, 2) =**//Endocrine System//** =

Endocrine system produce **hormones**, which are send to target cells to **control** blood pressure, body temperature, etc (part of homeostasis-staying balance).The major glands that make up the human endocrine system are the **hypothalamus**, **pituitary**, **thyroid**, **parathyroids**, **adrenals**, **pineal body**, and the **reproductive glands**.Hormones is the body's chemical messengers, hormones **transfer information** and **instructions** from one set of cells to another. Hormone levels can be influenced by factors such as stress, infection, and changes in the balance of fluid and minerals in blood.
 * Pineal body** controls daily biological cycles.
 * Pituitary gland** produce a kind of hormones that influence other endocrine glands.
 * Thymus gland** plays an important role in the immune
 * Thyroid gland** controls body heat, bone growth and the body's metabolism
 * Adrenal glands** Divided into 2 regions; secrete hormones that influence the body's metabolism, blood chemicals, and body characteristics, as well as influence the part of the nervous system that is involved in the response and defense against stress
 * Reproductive glands** controls the growth of reproductive system like: ovaries and testicles

( Hormones replacement therapies for men and women)

Hormones are send by glands. Many different hormones circulate throughout the bloodstream, each one affects only the cells that are genetically programmed to receive and respond to its message.When something is unbalance (temperature, blood pressure, etc), a hormone have to work with a programmed cell to **maintain equivalent.** (Sheth)
 * Hypothalamus** located in the **lower central part of the brain**, is the primary link between the endocrine and nervous systems. It can control the pituitary gland by producing chemicals that either stimulate or suppress hormone secretions from the pituitary.Too much of hormones can cause **serious problem** for the body. For example: ** Cushing syndrome, Growth hormone problems, **Hyperthyroidism, etc. Much hormonal regulation depends on feedback loops to maintain balance and homeostasis.

Homeostasis: Homeostasis is the regulation and maintenance of the internal environment (Harvey) Feedback: Feedback compares current conditions to set ranges (Harvey) negative feedback: Negative feedback counteracts change (Harvey) positive feedback: Positive feedback increases change (Harvey)
 * Vocabulary**

Stimulus: stimulus causes a response, can be chemical, cellular, or behavioral (Harvey) nervous system: The nervous system works quickly, using chemical and electrical signals (Harvey) central nervous system (CNS): divided into central nervous system (Harvey) peripheral nervous system (PNS): peripheral nervous system (Harvey) endocrine system: endocrine system works more slowly, using only chemical signals to communicate with non connected organs (Harvey)

Citation:[] htp://aisbiology.pbworks.com/w/page/24888203/Human-Biology [] [] []

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