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bella jabril
Week 7: Activity to 8
| Question | Answer |
|---|---|
| When a neuron is resting, the inner surface of its plasma membrane is slightly positive compared with its outer surface. | False |
| Which membrane receptor acts to directly change ion permeability when stimulated? | Gated-channel receptor |
| The brief period during which a local area of an axon's membrane resists re-stimulation is called the period. | refractory |
| The membrane potential maintained by a nonconducting neuron’s plasma membrane is called the membrane potential. | resting |
| Whether an impulse is continued through the neuron depends on the magnitude of the voltage in the axon hillock. | True |
| Neurons are the only living cells that maintain a difference in the concentration of ions across their membranes. | False |
| In a myelinated neuron, the impulse can travel under the myelin between nodes of Ranvier. | True |
| 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 pump. |
| The magnitude of the action potential peaks when the sodium channels close. | True |
| An ion channel that opens in response to a sensory stimulus is a(n) | stimulus-gated channel. |
| week | 8 |
| Another name for the parasympathetic nervous system is the nervous system. | craniosacral |
| The limbic system integrates | emotion. |
| The is an extension of the great toe, with or without fanning of the other toes, in response to stimulation of the outer margin of the sole of the foot. | Babinski sign |
| A reflex consists of either a muscle contraction or a | glandular secretion. |
| The effect of sympathetic stimulation on the urinary bladder is | relaxation. |
| Each skin surface area supplied by sensory fibers of a given spinal nerve is a | dermatome. |
| Which region of the brain plays a part in the mechanism responsible for emotions by associating sensory impulses with feelings of pleasantness and unpleasantness? | thalamus |
| The reticular activating system maintains | consciousness. |
| Axon terminals of autonomic neurons release either of two neurotransmitters, | norepinephrine and acetylcholine. |
| The groove between the frontal and parietal lobes of the cerebral cortex is the | central sulcus. |
| If the center of a reflex arc is the brain, the response it mediates is called a | cranial reflex. |
| The set of coordinated commands that control the programmed muscle activity mediated by extrapyramidal pathways is called the | motor program |
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bella jabril