LAB-ENDOCRINE SYSTEM

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Author:
skykrec
ID:
69636
Filename:
LAB-ENDOCRINE SYSTEM
Updated:
2011-02-28 17:12:05
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LAB ENDOCRINE SYSTEM
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Description:
LABORATORY-ENDOCRINE SYSTEM
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  1. T/F.The ENDOCRINE SYSTEM regulates the function of every cell, tissue and organ in the body.
    • TRUE.
    • *Acts to maintain a stable internal body environment, REGARDLESS of changes OCCURING within or outside of the body.
    • *ENDOCRINE cells have the ability to sense and respond to changes via the excretion of specific chemicals known as HORMONES.
  2. T/F. Hormones are carried in the blood usually attached to a specific plasma protein and circulate around the body.
    • TRUE.
    • *When a hormone-protein complex reaches a TARGET CELL, the hormone detaches from the PROTEIN and enters the cell to induce a specific reaction.
  3. Hormones that are composed of CHAINS of AMINO ACIDS, work by first attaching to a protein receptor in the cell membrane?
    • POLYPEPTIDE HORMONE-Initiating a series of reactions IN THE MEMBRANE resulting in CYCLIC ADENOSINE MONOPHOSPHATE (cAMP) entering the cell.
    • *The entrance of this chemical into cell induces the cell to work harder and faster.
  4. They are hormones secreted by the THYROID?
    • STEROID HORMONES and THYROXINE-
    • *They enter the cell to attach to a CYTOPLASMIC RECEPTOR. The hormone-receptor complex then enters the NUCLEUS of the cell to attach to specific POINTS in the DNA. Each attachment causes the production of a specific mRNA, which then moves to the cytoplasm to be translated into a specific protein.
  5. T/F. Most regulation of hormone levels in the body is conducted by negative feedback.
    • TRUE
    • *If a particular hormone is needed, production of that hormone will be stimulated.
    • *If there is enough of a particular hormone present, production of that hormone will be inhibited.

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