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The endocrine system affects bodily activities by releasing chemical messages, called hormones, into the bloodstream from exocrine and endocrine glands. The function of hormones is to:
Control the internal environment by regulating its chemical composition and volume
Respond to environmental changes to help the body cope with emergencies - infection, stress etc
Help regulate organic metabolism and energy balance
Contribute to the management of growth and development
Hormones are chemicals that cause certain changes in particular parts of the body. Their effects are slower and more general than nerve action. They can control long-term changes such as rate of growth, rate of activity and sexual maturity.
The endocrine or ductless glands secrete their hormones directly into the blood stream. The hormones are circulated all over the body and reach their target organ via the blood stream. When hormones pass through the liver, they are converted by the kidneys. Tests on such hormonal products in urine can be used to detect pregnancy.
In A&P 2, hormones were kinda difficult for me to remember... I honestly just had to study them over and over again. Try to group them... Anterior Pituitary hormones- growth hormone,thyroid-stimulating, adrenocorticotropic, gonadotropins, prolactin. And so forth.