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SCI 221- Set 2
| Question | Answer |
|---|---|
| Neurotransmitters are released in a synapse and bind to: | receptors on the postsynaptic neuron. |
| Within the nervous system, coding for the strength of a stimulus is accomplished through: | the frequency of nerve impulses. |
| If the magnitude of the local depolarization surpasses a limit called the _____, voltage-gated Na+ channels are stimulated to open. | threshold potential |
| T or F: The magnitude of the action potential peaks when the sodium channels close. | True |
| The _____ nerve transmits impulses that result in sensations of equilibrium. | vestibular |
| A _____ is a skeletal muscle or group of muscles that receives motor axons from a given spinal nerve. | myotome |
| Impulses sent over which of the following tracts could result in voluntary movement, especially of the hands, fingers, feet, and toes of the opposite side? | Lateral corticospinal |
| 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 |
| Which ear structures are responsible for the amplification and transfer of sound from the external ear to the inner ear? | The ossicles |
| If movement of a visual stimulus is leftward in one eye and rightward in the opposite eye, the brain interprets this as movement toward (or away) from the face along the midline. Which eye is visualizing leftward stimulus? | right eye |
| The clear and potassium-rich fluid that fills the labyrinth is | endolymph |
| Sensory impulses ending in what part of the CNS trigger imprecise or “crude” sensation awareness? | Thalamus |
| Neutrophils are highly mobile and phagocytic. They migrate out of blood vessels and into tissue spaces. This process is called | diapedesis |
| Atria are often called _____ because they receive blood from vessels called veins. | receiving chambers |
| The outermost layer of the larger blood vessels is the tunica | adventitia |
| 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. |
| Blood viscosity stems mainly from the red blood cells but also partly from the _____ in blood. | protein molecules present |
| The lymphatic system is made up of lymphatic vessels where lymph flows in only one direction towards | the heart |
| The function of which antibody is basically unknown? | IgD |
| The presentation of an antigen by an antigen-presenting cell activates the T cell. The cell then divides repeatedly to form a clone of identical sensitized T cells that form | effector T cells and memory cells. |
| Which of the following is a powerful poison that acts directly on any cell and quickly kills it? | lymphotoxin |
| During inspiration, as the size of the thorax increases, the | intrapleural and alveolar pressures decrease. |
| What law states that the volume of a gas is inversely proportional to its pressure? | Boyle's |
| The sensors that provide feedback information to the medullary rhythmicity area are the | central chemoreceptors and peripheral chemoreceptors. |
| The term used to describe the volume of air exchanged during normal inspiration and expiration is: | tidal volume. |
| The tendency of the thorax and lungs to return to the preinspiration volume is called: | elastic recoil. |
| Dalton law states that the partial pressure of a gas in a mixture of gases is _____ to the total pressure of the mixture. | directly related to the concentration of that gas in the mixture and |
| The act of expelling feces is called | defecation |
| The wave-like ripple of the muscle layer of the GI tract is called | peristalsis |
| Fats and other nutrients in the duodenum stimulate the intestinal mucosa to release a hormone called | gastric inhibitory peptide. |
| The enterogastric reflex causes: | inhibition of gastric peristalsis. |
| 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 major site for the absorption of the end products of digestion is the: | small intestine. |
| The hormone thought to be a messenger causing release of digestive enzymes from the intestinal mucosa is: | vasoactive intestinal peptide. |
Created by:
laureana