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Phsiology 7-13
| Question | Answer |
|---|---|
| A synaptic knob would be located on a(n): | axon. |
| A synapse consists of: | a synaptic knob. a synaptic cleft. the plasma membrane of a postsynaptic neuron |
| Which of the following is not one of the main chemical classes of neurotransmitters? | Triglycerides |
| During a relative refractory period: | the action potential can be initiated with a strong stimulus. |
| The magnitude of the action potential peaks when the sodium channels close? | True |
| A neurologist is using a voltmeter to measure potential. The membrane potential of a neuron was recorded at +30 mV. This is what type of membrane potential? | Action |
| Whether an impulse is continued through the neuron depends on the magnitude of the voltage in the axon hillock. | True |
| 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. |
| All of the following cranial nerves are involved in proprioception except the: vagus. hypoglossal. accessory. abducens. | vagus. |
| Which of the following is not true of the knee jerk reflex? | It is a flexor reflex. |
| In a healthy adult, a well-placed tap on the knee will result in a: | stretch of the tendon, the quadriceps femoris, and thereby stimulation of the muscle spindles. |
| Danielle has sustained an injury that has reduced her ability to complete simple tasks such as lifting a pencil, manipulating eating utensils, and brushing her hair. The injury has affected the _____ motor pathways _____ the central nervous system (CNS). | voluntary; outside |
| Sympathetic responses generally have widespread effects on the body because: | preganglionic fibers synapse with several postsynaptic fibers. |
| The cerebellum acts with the _____ to produce skilled movement. | cerebrum |
| Somatic motor and autonomic pathways share all of the following characteristics except: | number of neurons between central nervous system (CNS) and effector. |
| Once inside the sympathetic chain ganglion, the preganglionic fiber may: | ynapse with a sympathetic postganglionic neuron. send ascending and/or descending branches through the sympathetic trunk to synapse with postganglionic neurons in other chain ganglia. pass through one or more ganglia without synapsing. |
| Another name for the parasympathetic nervous system is the nervous system. | craniosacral |
| Which of the following is true about pain receptors? | Alpha fibers are associated with sharp, localized pain. |
| Sensory impulses ending in what part of the CNS trigger imprecise or “crude” sensation awareness? | Thalamus |
| Circulatory shock caused by a drop in the amount of blood in the circulatory system is called _____ shock. | hypovolemic |
| In the extrinsic pathway of stage 1 of the clotting mechanism, chemicals released from damaged tissues trigger the cascade of events that ultimately result in the formation of | prothrombin activator. |
| 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. |
| Which are the two baroreceptors that are located near the heart? | aortic baroreceptors and carotid baroreceptors |
| The functions of the lymph nodes are | defense and hematopoiesis. |
| Memory cells: | become plasma cells when exposed to an antigen. |
| Which of the following constitutes total lung volume? | Residual volume and vital capacity |
| Which of the following helps determine the amount of oxygen that diffuses into the blood each minute? | The total functional surface area of the respiratory membrane Alveolar ventilation The oxygen pressure gradient between alveolar air and incoming pulmonary blood |
| Which of the following combinations in arterial blood could cause an increase in the respiratory rate? | Increased PCO2, decreased arterial pressure, decreased pH, decreased PO2 |
| The PCO2 in alveolar air is _____ blood. | greater than in the systemic venous equal to the systemic arterial |
| External respiration can be defined as: | the exchange of gases between the lung and the blood capillaries in the lung. pulmonary ventilation. |
| The volume of air exhaled normally after a typical inspiration is called _____ volume. | tidal |
| Which structural feature facilitates oxygen diffusion from the alveolar air into the blood in lung capillaries? | The alveolar and capillary walls are both very thin. The alveolar and capillary surfaces are both extremely large. The lung capillaries accommodate a large amount of blood at one time. Each red blood cell comes close to alveolar air. |
| Which of the following is not true of enzymes? | They change chemically and are in the end products of the reaction. |
| The purpose of peristalsis is to: | propel food forward along the GI tract. |
| The enterogastric reflex causes: | inhibition of gastric peristalsis. |
| The hormone thought to be a messenger causing release of digestive enzymes from the intestinal mucosa is: | vasoactive intestinal peptide. |
| Which of the following is not one of the openings that must be blocked when food moves from the pharynx into the esophagus? | Oropharynx |
| Glucose moves from the GI tract into the circulatory system by the process of: | cotransport. |
| During which stage of swallowing is there a risk of food entering respiratory pathways? | Oropharyngeal |
Created by:
garza14