A ____ is a regulatory molecule that is secreted into the blood by an endocrine
ID: 84482 • Letter: A
Question
A ____ is a regulatory molecule that is secreted into the blood by an endocrine gland. a. metabolite b. hormone c. peptide d. G protein e. neurotransmitter Some intercellular regulatory molecules that exert only very local effects are called a. a. regulators. b sympathetic c. endocrine d. paracrine The anterior pituitary gland is controlled by which type of signal? a. direct axonal connections from the hypothalamus b. negative feedback from its own hormones c. positive feedback from its own hormones d. positive feedback from hormones secreted by the pancreas, heart, and skin Steroid hormones a. can pass through the membrane using a carrier b. has a direct effect on gene expression c. bind to membrane receptors d. both a & b are correct Second messengers are activated in response to a. steroid hormones b. thyroxin c. hydrophilic hormones d. All the choices are correct Hormones released by the pituitary gland have two different sources Those that are produced by the neurons of the hypothalamus are released through the_____ and those produced within the pituitary are released through the_____ a. thalamus; hippocampus b. neurohypophysis; adenohypophysis c. right pituitary; left pituitary d. cortex; medullaExplanation / Answer
12. A b. The hormone is a regulatory molecule secreted by endocrine gland directly into the bloodstream.
It is then transported via the blood to the target tissues for carrying out the required action.
13. Some intracellular regulatory molecules that exert only very local effects are called d. Paracrine
These paracrine substances exert their effect only in the vicinity of the organs that secrete them.
14. Anterior pituitary gland is controlled by which type of signal - a. Direct axonal connections from the hypothalamus.
These signals then induce the anterior pituitary to trigger the release of the endocrine hormones which further induce the effects on target tissues.
15. Steroid hormones a. can pass through membrane using carrier
The carriers then release the steroid hormones which diffuse through the membrane to bind the intracellular steroid hormone receptors. These intracellular receptors have a dual function to act as both signal transducer molecules as well as the transcription factors which in turn modulate the expression of the target genes.
16. Second messengers are activated in response to the c. hydrophilic hormones.
These hydrophilic hormones are knowns as the first messengers which can not cross the phospholipid bilayer of the cell. Hence they cannot initiate the effects within the cell. This triggers the release of the second messengers.
17. Hormones released by the pituitary gland have two different sources. Those that are produced by neurons of hypothalamus are released through the d. cortex and those produced within the pituitary are released by the d. medulla.
These cortex and medulla are a part of the adrenal gland
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