endocrine system
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Endocrine System
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The Endocrine System controls conditions in the body by making and sending chemicals from one place to another. It is controlled by the nervous system. Your endocrine system works automatically without your control.
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Structures and FunctionsOf Endocrine System
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The main structures of the endocrine system are groups of specialized cells called glands. These glands produce hormones and release them into your circulatory system so the hormones can travel through your blood stream.These glands can be found in many parts of your body. There are different names for all of these glands.
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Pituitary Gland
Director of system Located at base of brain – right above
mouth Many important types of hormones are
produced in pituitary gland including growth, sexual development, and water hormones.
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Hypothalamus
Attached to pituitary gland Connects nervous and endocrine
system
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Pineal Gland
Found deep in brain Sensitive to different levels of light Lets you know what is hot, cold, and
when you need to sleep or wake up
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Thyroid Gland
Found by Adam’s apple in throat Releases hormones necessary for
growth and metabolism Releases hormone that is responsible
for regulation of calcium in body
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Thymus
Found in chest Helps body fight disease by producing
white blood cells called T cells
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Adrenal Glands
Located on top of kidneys Produces hormones that balance
carbohydrates, protein, fat, water, and salt levels
Also produces hormones that make your heart beat faster when you hear loud noises, are on a roller coaster, or if you are stressed out
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Pancreas
Part of digestive and endocrine systems
Produces hormones to balance glucose in blood
Located beneath stomach – connected to small intestine
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Ovaries and Testes
Produce hormones that control sexual development
Located in groin area
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Some other organs produce hormones but are also parts of other systems like the kidneys and the heart.
Kidneys make hormone to balance production of red blood cells
Produced when oxygen level in blood decreases
The heart produces hormones that balance blood pressure
These hormones tell the kidneys to remove more salt
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Feedback
Negative and Positive
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Negative
Feedback mechanisms in the body are called negative mechanisms, because the final effect of the response is to turn off the response. When the hormone has been made to much the final response is shutting down reproduction of that hormone. When the body needs energy the thyroid gland releases thyroxine to increase cellular respiration and the more cellular respiration the more body energy is released.
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Positive
The outcome of the positive feedback is not to maintain homeostasis, but makes a response that increases. For example when you cut yourself you’re bleeding is controlled by positive feedback. First the damaged area sends a signal which starts a chain of chemical reactions that leads to good blood clot, that let the scab and white blood cells heal the open skin
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Hormone Balance
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Balanced Hormone Action
The amount of one hormone depends on the balance or imbalance of another
For example, the pancreas produces two different hormones - one (insulin) decreases level of sugar in blood- another (gulucan) decreases level of sugar in blood
The balance of these hormones maintain a stable blood sugar
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Imbalanced Hormone Action
Too little or too less of any hormone can cause disease
For example, if the pancreas produces too little insulin, sugar levels in blood rise to dangerous levels
The high blood sugar levels can damage circulatory system and kidneys