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anatomy 7-13
| Question | Answer |
|---|---|
| During a relative refractory period: | the action potential can be initiated with a strong stimulus. |
| When an impulse reaches a synapse: | chemical transmitters are released. |
| Which of the following is not one of the main chemical classes of neurotransmitters? | Triglycerides |
| What would the result be if the phrenic nerve received an impulse from the cervical plexus? | The diaphragm would stop contracting. |
| Sympathetic responses generally have widespread effects on the body because: | preganglionic fibers synapse with several postsynaptic fibers. |
| Nerve impulses over the _____ nerve cause increased peristalsis and decreased heart rate. | vagus |
| Clearness or sharpness of visual perception is known as: | visual acuity |
| The last step in the nonsteroid hormone mechanism of action is: | protein kinases activate other enzymes. |
| The heart begins beating in the fetus at about what stage of development? | After about 4 weeks |
| Blood viscosity stems mainly from the red blood cells but also partly from the _____ in blood. | protein molecules present |
| The ability of our immune system to attack abnormal or foreign cells but spare our own normal cells is called: | self-tolerance. |
| Internal respiration can be defined as: | the exchange of gases between the blood capillaries and the tissue cells. |
| When classified according to the kind of chemical reactions catalyzed, digestive enzymes are referred to as _____ enzymes. | hydrolyzing |
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averyjalyn