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MCAT Bio. Ch. 5
| Term | Definition |
|---|---|
| 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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