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 C
Explanation
A. tropomyosin returns to its original position: This happens later in the process; it is a result of calcium removal, not the first event.
B. myosin cross-bridges are prevented from binding to actin: This is the final stage of relaxation where the physical contraction stops.
C. the sarcoplasmic reticulum begins actively pumping calcium back into its sacs: Relaxation officially begins when nerve stimulation stops and the sarcoplasmic reticulum uses active transport to remove Ca 2+ from the sarcoplasm.
D. acetylcholine is released: This is the first step of muscle contraction, not relaxation.
Correct Answer is D
Explanation
A. Back of the hand: This area has "thin skin" with a relatively thin stratum corneum.
B. Thigh: This is also considered thin skin.
C. Abdomen: This is standard thin skin.
D. Sole of the foot: The soles of the feet and the palms of the hands consist of "thick skin," which has a significantly expanded stratum corneum to protect against high friction and pressure.
Whether you are a student looking to ace your exams or a practicing nurse seeking to enhance your expertise , our nursing education contents will empower you with the confidence and competence to make a difference in the lives of patients and become a respected leader in the healthcare field.
Visit Naxlex, invest in your future and unlock endless possibilities with our unparalleled nursing education contents today
Report Wrong Answer on the Current Question
Do you disagree with the answer? If yes, what is your expected answer? Explain.
Kindly be descriptive with the issue you are facing.