Glands are examples of effectors (carry out responses as a result of the detection of a stimulus by receptors) and secrete hormones
Important glands - pancreas, thyroid, adrenal, pituitary, ovaries, testes
Hormones are secreted by glands, and are chemical messages which are carried in the blood
Hormones are different to nervous system responses - hormones are slow-acting and have long term impacts, whereas responses by effectors like muscles as instant and short-term
Negative Feedback = the reaction causes the opposite of the stimulus to occur (eg something is too hot, so cold will bring it back to normal temperature)
Homeostasis = maintaining a stable internal environment (including temperature, pH, etc). This is important as all the reactions in the body must be able to occur
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