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physiology 2025
study stack 2 2025-1-SCI221-07
| Question | Answer |
|---|---|
| The term that literally means self-immunity is: | autoimmunity. |
| Which of the following is a protein substance with no DNA or RNA and is thought to be the cause of mad cow disease? | Prion |
| Negative-feedback control systems: | oppose a change |
| If the secretion of oxytocin during childbirth operated as a negative-feedback control loop, what effect would it have on uterine contractions? | Oxytocin would inhibit uterine contractions |
| 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. |
| There are two types of synapses—the electrical synapse and the __________ synapse. | chemical |
| The speed of a nerve impulse depends on the neuron’s resting potential. | False |
| Which of the following antidepressants acts by blocking the action of monoamine oxidase (MAO)? | Phenelzine |
| During a relative refractory period: | the action potential can be initiated with a strong stimulus. |
| The fastest nerve fibers in the body can conduct impulses up to approximately _____ meters per second. | 130 |
| A reflex consists of either a muscle contraction or a | glandular secretion. |
| The most numerous cerebral tracts are the | association tracts. |
| Accommodation for near vision necessitates | all of the above. an increase in the curvature of the lens. constriction of the pupils. convergence of the two eyes. |
| Inhibition of sympathetic vasoconstrictor impulses is considered a major mechanism of | vasodilation. |
| The chemoreceptors in the carotid bodies are particularly sensitive to: | hypercapnia. |
| During pregnancy, what happens to the oxygenated blood returned from the placenta via the umbilical vein? | It flows into the inferior vena cava. |
| The ability of our immune system to attack abnormal or foreign cells but spare our own normal cells is called: | self-tolerance. |
| _______ is the only antibody class with the ability to cross the placental barrier, providing passive immunity to the developing fetus during pregnancy. | IgG. |
| An increase in carbon dioxide in the blood causes | a drop in pH in the blood. |
| _____ law states that the volume of a gas is inversely proportional to its pressure. | Boyle’s |
| By the time the blood leaves the lung capillaries to return to the heart, what percentage of the blood’s hemoglobin has united with oxygen? | 97% |
| External respiration can be defined as | both A and B. the exchange of gases between the lung and the blood capillaries in the lung. pulmonary ventilation. |
| Stimulation of gastric juice secretion occurs in all of the following phases except the _____ phase. | digestive |
| What percentage of this blood flow comes from the hepatic portal system? | 80% |
| Which of the following is not one of the openings that must be blocked when food moves from the pharynx into the esophagus? | Oropharynx |
| The hormone that inhibits gastric muscle, slowing passage of food into the duodenum, is called: | gastric inhibitory peptide. |
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janinealv36
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