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SCI221_Wk14_Assign
Weeks 7-13 StudyStack
| Question | Answer |
|---|---|
| Which is true of a neuron with a resting potential? | The sodium pump has moved Na+ to the outside of the plasma membrane. |
| Which of the following is true of spatial summation? | Neurotransmitters released simultaneously from several presynaptic knobs converge on one postsynaptic neuron. |
| Excitatory neurotransmitters are most likely to: | initiate an action potential. |
| Which is true of an action potential? | The outside of the plasma membrane is negatively charged, and the inside is positively charged. |
| The first event to occur when an adequate stimulus is applied to a neuron is: | some of the sodium channels at the point of stimulation open. |
| Which of the following is not one of the main chemical classes of neurotransmitters? | Triglycerides |
| A mixed nerve is one that: | carries both sensory and motor fibers |
| The part of the brain that can directly influence or inhibit the release of hormones from the pituitary is the: | hypothalamus. |
| Which of the following is not true? | One bundle of nerve fibers (nerve roots) projects from each side of the spinal cord. |
| The parasympathetic and sympathetic divisions always act with a cooperative influence, and through summation of the impulses, the effect can be increased. | False |
| If the dorsal root ganglia of the spinal nerve were destroyed, a person would lose _____ related to that pathway. | sensory perception |
| If the ventral nerve root of a spinal nerve were destroyed, a person would lose _____ related to that pathway. | willed movement |
| Which is not true of the hormone somatostatin? | It stimulates the secretion of insulin |
| Which of the following is a function of glucagon? | Tends to increase blood glucose concentrations |
| The somatic senses enable us to detect sensations, including: | touch, temperature, pain, ALL are correct!! |
| If you slammed your finger in a car door, it would stimulate _____ pain fibers. | acute |
| Which of the following is not true of a receptor potential? | It follows the all-or-none law. |
| The production of thyroid hormone is stimulated by another hormone from the: | anterior pituitary |
| The term used to describe the collection of mechanisms that influence the circulation of blood is: | hemodynamics |
| 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 localized pressure gradient needed to maintain blood flow in a tissue is called | perfusion pressure |
| The term blood type refers to the type of blood cell | antigen |
| Erythrocytes begin their maturation sequence in red bone marrow from nucleated cells known as: | hematopoietic stem cells |
| The body’s defense mechanisms can be organized into one of two major categories of immune mechanisms; these are | innate and adaptive immunity |
| Activities that result in central movement or flow of lymph are called | lymphokinetic activities |
| Because T cells attack pathogens more directly, T-cell immune mechanisms are classified as _____ immunity. | cell-mediated |
| Chemotaxis is the process by which a cell navigates toward the source of the chemotactic factor by way of | detecting and then moving toward higher concentrations of the factor. |
| The primary organ of the lymphatic system is the | thymus. |
| The lymphatic system serves various functions in the body. The two most important functions of this system are | fluid balance and immunity |
| Which type of breathing is characterized by repeated sequences of deep gasps and apnea, and is usually seen in people with increased intracranial pressure? | Biot’s breathing |
| Which of the following constitutes total lung volume? | Residual volume and vital capacity |
| Excessive fluid in the pleural cavity would be most likely to cause: | decreased vital capacity |
| The vital capacity is equal to the sum of the: | inspiratory reserve volume, tidal volume, and expiratory reserve volume |
| 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% |
| 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 |
| Boyle’s law states that the volume of a gas varies _____ with pressure at a _____ temperature. | inversely; constant |
| Hydrolysis refers to: | using water to split larger compounds into smaller ones. |
| The hormone that inhibits gastric muscle, slowing passage of food into the duodenum, is called: | gastric inhibitory peptide |
| The enzyme pepsin begins the digestion of: | protein |
| The hormone that stimulates the gallbladder to release bile is: | cholecystokinin |
| The substances absorbed into the lymph capillaries are: | glycerol and fatty acids |
| When classified according to the kind of chemical reactions catalyzed, digestive enzymes are referred to as _____ enzymes. | hydrolyzing |
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dwnsfaith
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