chapter 13 Flashcards
endocrine glands
Secrete chemical messengers into called hormones into the blood. Some endocrine glands are Hypothalamus, pituitary gland, pineal gland, thyroid gland, parathyroid gland, pancreas, testies, ovaries.
hormones
Chemical messengers released into the blood stream that go all over the body but only target its specific target cells. They attach to specific receptor proteins.
ADH, aldosterone,
steroid hormones
Lipid based, non-soluble hormones, that can pass through the phospholipid bilayer and can even go into the nucleus membrane.
Testies, ovaries, and adrenal cortex.
non-steroid hormones
Water soluble or amino acid based hormones which cannot pass through the phospholipid bilayer. They require a protein receptor. Most of the hormones
negative feedback
When homeostasis is reached or when the hormone has acted on its target cells, a negative feedback is sent to the tropic and target glands to inhibit the secretion of the hormone.
ADH (antidiuretic hormone)
To regulate water concentration in the blood.
Stimulus - homeostasis when hypothalamus detects more concentrated blood and low blood pressure and send a neuron signal to the posterior pituitary gland to release the stored ADH.
Target - kidney cells. ADH makes the kidney tubules more permeable to water and it reabsorbs more water resulting in a more concentrated urine.
Feedback- Hypothalamus detects high blood pressure and homeostasis and sends a neuron signal to posterior pituitary to stop the secretion of ADH.
Diabetes Insipidus
Results when the body can’t produce ADH, which results in more urine and loss of ions as the body can’t reabsorb water.
Tropic hormones
Most hormones from Hypothalamus and the posterior pituitary. Hormones that target other endocrine glands to produce other hormones.
Hypothalamus produces HORMONE 1 and it targets pituitary gland which produces HORMONE 2 which targets other endocrine gland which produces HORMONE 3.
