Title: Endocrine: biochemistry, secretion and transport of hormones Post by: stylas on Dec 13, 2011 Hi does anyone have the answer key for the following questions? i have done them but i want to check my answers to see how well ive done.
1. Place the following hormones into one of the three categories of hormones (peptides, amines or steroids): T4 (thyroxin), estradiol, norepinephrine, insulin, aldosterone, glucagon, cortisol, growth hormone, T3 (triiodothyronine), epinephrine, testosterone and vasopressin (ADH). Peptides Amines Steroids 2. Peptide hormones are synthesized as large precursor hormones called ______________. The hormones (or prohormones) are stored in _______ ________ and released from the cell by ___________. Do peptide hormones require a carrier in the blood stream? 3. Catecholemines are produced in the _________ of the adrenal gland and are classified as ___________ hormones since they are derived from ___________. Stimulation of the chromaffin cells causes an influx of ________ ions, which causes the vesicles to merge with the plasma membrane and release the hormone by __________. Are catecholemines water-soluble or lipid-soluble? 4. Thyroid hormones include two molecules called _____and ____. T3 consists of two ________ molecules plus ___ iodine molecules and is (more or less) abundant than T4. Are carriers required for the transport of thyroid hormones? 5. All steroid hormones are derived from ____________, which steroid hormone is produced is determined by the _________ present in the cell. The common precursor molecule for all steroid hormones is _______________. Steroid hormones enter the blood stream by __________ and __________ (do or do not) require a carrier. The rate of secretion of steroid hormones is (faster or slower) than catecholemines because steroid hormones are not ____________. 6. Preganglionic sympathetic fibers trigger the release of ___________ and __________ (hormones) from the ________ _______ (gland), this is an example of neural regulation of hormone secretion. 7. Two examples of hormonal regulation of hormone secretion include: 1) the negative feedback of T3 & T4 to decrease _____ levels; and 2) the negative feedback of cortisol which decreases both ______ and _____ levels. 8. Besides increased levels of plasma glucose and amino acids (humoral regulation), increased levels of both _______ (hormone) and the __________ nervous system increase plasma insulin levels. 9. Some hormones are released in rhythmic 24 hour patterns know as _____________ rhythms. _____________ is a hormone where stressful stimuli can override this pattern and increase the plasma hormone levels. In contrast, _______ hormones (amine hormones) are an example where large amounts of the hormones are bound to carrier proteins in the plasma forming a large circulating reservoir. Thus, acute changes do not produce large changes in the plasma level of this hormone. 10. The _______ and _________ are the major organs that metabolize hormones. The type of hormone determines how fast they are metabolized. _________ and ____________ are rapidly metabolized, while __________ and _________ take longer to metabolize. 11. Nuclei in the ventral hypothalamus produce two hormones that are stored in the posterior pituitary. Name the two nuclei that produce these hormones and name the two hormones, one of which is important for water balance. Title: Re: Endocrine: biochemistry, secretion and transport of hormones Post by: duddy on Dec 14, 2011 One question per thread please ;)
Title: Re: Endocrine: biochemistry, secretion and transport of hormones Post by: danielshor on Feb 18, 2012 Hey thanks so much for this! This is so helpful! You guys are the best! ;D
Title: Re: Endocrine: biochemistry, secretion and transport of hormones Post by: Hurley on Apr 15, 2012 I'm pretty sure these are right: (1-3 & some of 4)
1. Place the following hormones into one of the three categories of hormones (peptides, amines or steroids): T4 (thyroxin), estradiol, norepinephrine, insulin, aldosterone, glucagon, cortisol, growth hormone, T3 (triiodothyronine), epinephrine, testosterone and vasopressin (ADH). Peptides Amines Steroids Insulin Glucagon Epinephrine Norepinephrine T3 (triiodothyronine) T4 (thyroxin) Growth hormone Cortisol Estradiol Aldosterone testosterone and vasopressin (ADH) 2. Peptide hormones are synthesized as large precursor hormones called preprohormones. The hormones (or prohormones) are stored in the rough ER and released from the cell by exocytosis. Do peptide hormones require a carrier in the blood stream? No. 3. Catecholemines are produced in the medulla of the adrenal gland and are classified as hormones since they are derived from tyrosine. Stimulation of the chromaffin cells causes an influx of calcium ions, which causes the vesicles to merge with the plasma membrane and release the hormone by exocytosis. Are catecholemines water-soluble or lipid-soluble? Water-soluble. 4. Thyroid hormones include two molecules called T4 (thyroxine) and T3 (triiodothyronineand). T3 Title: Re: Endocrine: biochemistry, secretion and transport of hormones Post by: TDub8 on Apr 23, 2012 THANKS SO MUCH!!
Title: Re: Endocrine: biochemistry, secretion and transport of hormones Post by: Brainiac34 on Aug 26, 2012 Please answer number 7, 8, and 10 on that same page. Thank you
7. Two examples of hormonal regulation of hormone secretion. 1) the negative feedback of T3 and T4 to decrease ----- levels: and 2) the negative feedback of cortisol which dereases both ----- and ----- levels. 8. Besides increased levels of plasma glcose and amino acides (humoral regulation), increased levels of both ----- (hormone) and the ------ nervous system increase plasma insulin levels. Title: Re: Endocrine: biochemistry, secretion and transport of hormones Post by: colleen on Aug 26, 2012 Please update us with the answers :D
Title: Re: Endocrine: biochemistry, secretion and transport of hormones Post by: biohottie on Sep 3, 2012 Hi Everyone,
This is very helpful. Can anyone help me out with the following question? I've been trying to find it all day. Thanks, BIOhottie Haha forgot to post it. Here it is: TRH, GNRH, CRH etc. are known as ____________ hypothalamic hormones which regulate the function of the _________ pituitary. These hormones are released into capillary beds and carried directly to the pituitary by the __________ ________ ________ located in the __________________. Title: Re: Endocrine: biochemistry, secretion and transport of hormones Post by: mysweetpixxel on Sep 3, 2012 biohottie: I have the same sheets in front of me. Did you find the answers to number 3 on that sheet? Or any of the others haha.
Here they are 2. ventral, anterior, hypophyseal portal veins, located in the infunibulum. correction infundibulum Title: Re: Endocrine: biochemistry, secretion and transport of hormones Post by: rachlagu on Oct 16, 2012 Peptides:
vasopressin glucagon insulin growth hormone Amines: t3 t4 epinephrine norepinephrine Steroids: estradiol cortisol aldosterone testosterone #2: preprohormones; secretory vesicles; exocytosis #3 medulla; amine; tyrosine; calcium; exocytosis; water soluble #4 t3 & t4; tyrosine; three; less abundant; no b/c lipid soluble. Title: Re: Endocrine: biochemistry, secretion and transport of hormones Post by: llsalexander on Nov 8, 2012 This is so helpful thanks!!!
#2 preprohormones,secretory vesicles,exocytosis,no #3medulla,amine,tyrosine,calcium,exocytosis,watersoluble #4 T4,T3,tyrosine,3,less,no #5cholesterol,enzyme,pregnenolone,diffusion,do,slower,stored #6epinephrine,norepinephrine,adrenal medulla, #7TSH,ACTH,CRH #8GIP,parasympathetic, #9circadian,cortisol,thyroid(T3&T4) #10 liver,kidneys,catecholamines,peptide hormones,thyroid hormones,steroid hormones This is so helpful thanks!!! #2 preprohormones,secretory vesicles,exocytosis,no #3medulla,amine,tyrosine,calcium,exocytosis ,watersoluble #4 T4,T3,tyrosine,3,less,no #5cholesterol,enzyme,pregnenolone,diffusion,do,slower,stored #6epinephrine,norepinephrine,adrenal medulla, #7TSH,ACTH,CRH #8GIP,parasympathetic, #9circadian,cortisol,thyroid(T3&T4) #10 liver,kidneys,catecholamines,peptide hormones,thyroid hormones,steroid hormones Title: Re: Endocrine: biochemistry, secretion and transport of hormones Post by: bioani on Dec 16, 2012 Thank you!
|