They release factors which attract more platelets, and as more platelets cling even more factors are released that attract even more platelets. Finally when hole is plugged, the blood is no longer in contact with the connective tissue and the platelet response ends. They cannot be stored because they are lipid soluble and will simply diffuse through the cell membrane once made. Usually peptide hormones produce a more rapid response at the target cell than steroid hormones. Explain why by comparing the cellular mechanisms activated by each.
Peptide hormones act on membrane receptors which activate proteins that are already present.
Steroids usually act on intracellular receptors that acitvate gene transcription leading to the synthesis of new proteins. This takes longer. Cortisol is required for full activity of both glucagon and catecholamines. Spell out the names of the hormones represented by the following acronyms GnRH gonadotropin releasing hormone ACTH adrenocorticotropic hormone TSH thyroid stimulating hormone PIH prolactin inhibiting hormone 10. A man comes in for a physical exam and is given a glucose tolerance test.