When an impulse reaches a synapse:
two nerve fibers come in direct contact.
impulses will pass in either direction.
an electrical spark will jump the gap.
chemical transmitters are released.
The Correct Answer is D
A. two nerve fibers come in direct contact: In a chemical synapse, there is a physical gap called the synaptic cleft; the neurons do not touch.
B. impulses will pass in either direction: Chemical synapses are one-way streets because receptors are only located on the postsynaptic membrane.
C. an electrical spark will jump the gap: Nerve impulses are electrochemical, but they do not "spark" across the air/fluid gap like static electricity.
D. chemical transmitters are released: The arrival of an action potential triggers the release of neurotransmitters (like acetylcholine) to carry the signal across the cleft.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Environment: Factors like pollution, climate, or radiation exposure are known risk factors for various diseases.
B. Stress: Chronic stress weakens the immune system and contributes to cardiovascular and mental health issues.
C. Lifestyle: Choices regarding diet, exercise, and tobacco use directly impact the risk of developing chronic illnesses.
D. All of the above: Since environment, stress, and lifestyle are all recognized as significant risk factors for disease, "All of the above" is correct.
Correct Answer is B
Explanation
A. fluid balance and waste removal: While the system does move waste, "waste removal" is more a function of the urinary and digestive systems.
B. fluid balance and immunity: The lymphatic system returns leaked tissue fluid to the blood (fluid balance) and houses white blood cells that fight infection (immunity).
C. immunity and waste removal: This misses the critical role of returning fluid to the circulatory system to prevent edema.
D. waste removal and gas exchange: Gas exchange is strictly the function of the respiratory and circulatory systems.
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