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Alexis Dean
Physiology Final
| Question | Answer |
|---|---|
| The active transport mechanism in the plasma membrane that transports sodium and potassium ions in opposite directions and at different rates is the | sodium-potassium channel |
| Which is true of a neuron with a resting potential? | The sodium pump has moved Na+ to the outside of the plasma membrane. |
| Compared with the outside of the neuron, the inside has a(n) ____ charge. | negative |
| 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 |
| Parasympathetic stimulation has no effect on any of the following areas except: | sweat glands. |
| One of the few hormones that functions on a positive-feedback loop is: | oxytocin. |
| The heart begins beating in the fetus at about what stage of development? | After about 4 weeks |
| During their residence in the thymus, pre-T cells develop into _____, cells that proliferate as rapidly as any in the body. | thymocytes |
| Recognition of antigens by antibodies occurs when an | antigen’s epitopes fit into and bind to an antigen molecule’s antigen-binding site. |
| External respiration can be defined as: | the exchange of gases between the lung and the blood capillaries in the lung. AND pulmonary ventilation |
| The regulation of acid-base balance in the body fluids refers to the control of _____ ion concentration. | hydrogen |
| Cellulose is a residue of digestion that comes from: | carbohydrates. |
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