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MCAT Bio. Ch. 5

TermDefinition
Endocrine Signaling Involves Secretion Of Hormones Directly Into: The bloodstream
Hormones Travel To Distant Target Tissues Where They Bind To: Receptors and induce a change in gene expression or cell function
Peptide Hormones Are Composed Of: Amino acids and are derived from larger precursors that are cleaved during posttranslational modifications
Peptide Hormones Are Polar And Cannot Pass Through: The plasma membrane
Peptide Hormones Bind To: Extracellular receptors where they trigger the transmission of a secondary messenger
Each Step Of The Signaling Cascade Can Demonstrate: Amplifcation of the signal
Peptide Hormones Usually Have Rapid Onset But: Are short-lived
Peptide Hormones Travel Freely In The Bloodstream And Do Not Require: A special carrier
Steroid Hormones Are Derived From: Cholesterol
Steroid Hormones Are Minimally Polar And Can Pass Through: The plasma membrane
Steroid Hormones Bind To: Intracellular or intranuclear receptors where they promote conformational change and bind to DNA, which affects the transcription of a particular gene
Steroid Hormones Usually Have Slow Onset But: Are long-lived
Steroid Hormones Cannot Dissolve In The Bloodstream And Must be Carried By: Specific proteins
Amino Acid-Derivative Hormones Are Modified amino acids. Their chemistry shares some features with peptide hormones and some features with steroid hormones. Different amino acid-derivative hormones share different features with these other hormone classes.
Ex's Of Amino Acid-Derivative Hormones Include: Epinephrine, norepinephrine, triiodothyronine, and thyroxine
Direct Hormones Have Major Effects In: Non-endocrine tissues
Tropic Hormones Have Major Effects In: Other endocrine tissues.
The Hypothalamus Is The Bridge Between: The nervous and endocrine systems
The Release Of Hormones From The hypothalamus Is Mediated By A Number Of Factors Including: Projections from other parts of the brain, chemo- and baroreceptors in the blood vessels, and negative feedback from other hormones
In Negative Feedback, The Final Hormone (Or Product) Of A Pathyway Inhibits: Hormones (or enzymes) earlier in the pathway, maintaining homeostasis.
Created by: SamB91
 

 



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