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physiology final
study stack 2
| Question | Answer |
|---|---|
| Which membrane receptor acts to directly change ion permeability when stimulated? 1. Gated-channel receptor 2. G-protein-coupled receptors 3. Metabotropic receptor 4.Ionotropic receptor | Ionotropic receptor |
| The mechanisms that produce and maintain the resting membrane potential do so by producing a | slight excess of positive ions on the outer surface of the plasma membrane. |
| If the threshold potential is surpassed, the full peak of the action potential is always reached. true or false | true |
| Which is not true of the hormone somatostatin? | that it secretes the hormone insulin |
| Which of the following is a function of glucagon? 1.Promotes the entry of glucose into tissue cells 2.Tends to decrease blood glucose concentrations 3.Tends to increase blood glucose concentrations 4.Converts glucose into glycogen | Tends to increase blood glucose concentrations |
| During pregnancy, what happens to the oxygenated blood returned from the placenta via the umbilical vein? 1.It flows into the inferior vena cava. 2. It flows into the superior vena cava. 3.It flows into the ductus venosus. 4.It flows into | It flows into the inferior vena cava. |
| What is the functional significance of large areas of cardiac muscle being electrically coupled to form a single functional syncytium? | Because they form a syncytium, muscle cells can pass an action potential along a large area of the heart wall, stimulating contraction in each muscle fiber of the syncytium |
| The internal iliac artery supplies blood to the | fingers |
| Fluid that is clear, watery and contains protein molecules, salts, and other substances is called | intercellular fluid |
| The T cell is considered 1. the messenger 2. the transmitter 3. the communicator 4. the receiver | communicator |
| Which antibody is synthesized by immature B cells and then inserted into their plasma membranes? | immunoglobulin D |
| The body’s defense mechanisms can be organized into one of two major categories of immune mechanisms; these are | species resistance and specific immunity. |
| The sensors that provide feedback information to the medullary rhythmicity area are the | central chemoreceptors and peripheral chemoreceptors |
| Stimulation of gastric juice secretion occurs in all of the following phases except the _____ phase. | intestinal |
| Peristalsis is regulated in part by the intrinsic stretch reflexes. It is also thought to be stimulated by the hormone | cholecystokinin (CCK) |
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Kyraslater
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