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Endocrine System

Study Questions

"Endocrine" means acts upon target cells.
Nonsteroid hormones cause ________ in their target cells. activation of adenylate cyclase
Target cells for releasing hormones are in the anterior pituitary gland.
True/False. A hormone is a secreted molecule that is carried in the bloodstream to where it acts on target cells that bear specific receptors for that hormone. True
True/False. Steroid hormones diffuse through cell membranes, then bind with receptors, whereas nonsteroid hormones bind receptors on the target cell membrane. True
The specificity of hormone action derives from target cell receptors that are unique for each hormone.
Steroid hormones are soluble in lipids.
A nonsteroid hormone acts on a target cell by causing synthesis of a second messenger.
A steroid hormone acts on a target cell by directly causing protein synthesis.
True/False. Nonsteroid hormones include peptides, proteins, glycoproteins, and amines. True
___controls hormone concentrations. negative feedback
Nerve fibers in the posterior lobe of the pituitary gland secrete antidiuretic hormone.
The ____ secretes triiodothyronine thyroid gland
Maxwell has a very high metabolic rate, is skinny, and has protruding eyes. These are symptoms of hyperthyroidism.
The opposing roles of the thyroid and parathyroid maintain the balance of calcium and phosphate ions in the blood. What will happen if the parathyroid gland develops a defect that prevents PTH secretion? The amount of calcium ions and phosphate ions in the blood will decrease.
The hormone that stimulates calcium deposition into bone is calcitonin.
The secretion of parathyroid hormone is controlled primarily by the concentration of blood calcium.
In addition to a drop in blood calcium concentration, a symptom of hypoparathyroidism is muscle cramps
Which of the following has both endocrine and exocrine functions? Pancreas
The pineal gland is attached to the thalamus
The thyroid gland has a special ability to remove the element ________ from the blood. Iodine
A hormone is released from the hypothalamus, stimulating the anterior pituitary gland to release another hormone that is involved in metabolism. The flow of that hormone back to the hypothalamus inhibits the production of the first hormone in the pathway, also ceasing the production of the metabolism-influencing hormone. (Is an example of a ____ _____) Negative feedback loop
The thymus gland secretes hormones called ____ that ____. thymosins; control production and differentiation of white blood cells
The nervous system releases neurotransmitters into synapses. In contrast, the endocrine system releases ________ into the bloodstream. Answer: hormones Hormones
Compared to the nervous system, the endocrine system may have a longer lasting effect.
Tropic hormones stimulate certain endocrine glands to secrete hormones.
Secretions that affect only nearby cells are termed endocrine
Exocrine glands differ from endocrine glands in that exocrine glands secrete through ducts or tubes or the body's exterior
A sweat gland is an example of a(n) ________ gland. exocrine
Amines, Proteins, Peptides, Glycoproteins are all ________ hormones. Non-steroid
Created by: mihagstrom
 

 



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