Insulin/glucagon
The pancreas.
The insulin acts of the liver and cells in the body whereas glucagon acts on the liver.
Work together to regulate blood glucose levels. Insulin lowers the blood glucose level if it becomes too high whereas glucagon raises the blood glucose level if it becomes dangerously low.
Too much insulin can cause hypoglycemia because the liver produces less glucose and the cells of the body absorb more glucose. Too much glucagon results in too much glucose in the bloodstream because it is not absorbed by the cells and can result in high blood sugar.
Not enough insulin causes a rise in the blood glucose level because the glucose remains in the bloodstream. Not enough glucagon results in dangerously low blood glucose levels
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Too little adrenaline can cause an inefficient reaction to stressful situations, therefore not preparing the body for situations that can be demanding.
Thyroxine
The thyroid gland.
The bloodstream (to cells in body), liver, and kidneys.
Regulates body’s metabolic rate, controls the heart, digestive, and reproductive function, and aids in development.
Too much thyroxine can result in an increased metabolic rate, sweating, and weight loss.
Too little thyroxine can result in obesity, tiredness, and the swelling of the neck due to an enlarged thyroid gland called a goiter.
Luteinizing hormone
The anterior pituitary gland.
The testes and the ovaries.
Signal the production of testosterone (in males) by the testes, and causes the egg to be released from the ovaries (in females).
Too much luteinizing hormone can result in an increased production of testosterone in females, and in males, the testes can be produced too small and unable to produce sperm efficiently due to a decrease in testosterone.
Not enough luteinizing hormone causes infertility in males and females and the inability of ovulation to occur in