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216 Chapter 17
terms
| Question | Answer |
|---|---|
| The contraction, or period of contraction, of the heart that drives the blood onward into the aorta and pulmonary arteries. | systole |
| Influencing the force or energy of muscular contractions. | inotropic |
| The dilatation of the heart; or the period of dilatation, which is the interval between the second and the first heart sound and is the time during which blood enters the relaxed chambers of the heart from the systemic circulation and the lungs. | diastole |
| A small, local, involuntary contraction of muscle resulting from spontaneous activation of a single muscle fiber or of an isolated bundle of nerve fibers. | fibrillation |
| The reduction of a cell membrane potential to a less-negative value than that of the potential outside the cell. | depolarization |
| Moving backward or against the usual direction of flow; reverting to an earlier state or worse condition (degenerating); catabolic. | retrograde |
| A multinucleate mass of protoplasm produced by the merging of a group of cells. | syncytium |
| Pertaining to the whole body rather than to a localized area or region of the body. | systemic |
| Circulation which moves blood through the lungs and creates a link with the gas exchange function of the respiratory system | pulmonary (or central) |
| Circulation which moves blood throughout all the other tissues of the body | systemic (or peripheral) |
| In the circulatory system, depends on a blood volume that is sufficient to fill the blood vessels and a pressure difference across the system that provides the force that is needed to move blood forward. | blood flow |
| Refers to the principles that govern the flow of blood in the vascular system | hemodynamics |
| The relationship between pressure and resistance can be quantified by what has become known as _____________ law | Poiseuille's |
| Describes the relationship between wall tension, pressure, and the radius of a vessel or sphere | law of Laplace |
| Muscular portion of the heart, forms the walls of the atria and ventricles. | myocardium |
| Are unique to cardiac muscle, contain gap junctions that serve as low-resistance pathways for passage of ions and electrical impulses from one cardiac cell to another | intercalated discs |
| Is a thin, three-layered membrane that lines the heart and covers the valves | endocardium |
| Large specialized fibers that allow for rapid conduction and almost instantaneous excitation of both the right and left ventricles. | Purkinje |
Created by:
ACC Bio Harrison
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