Practice Question
Which of the following functions does the myelin sheath perform for a nerve cell?
Answer Choices:
Correct Answer:
Insulation
Rationale:
⪢The myelin sheath is a fatty layer that wraps around the axons of many neurons.
⪢ It functions primarily as insulation, preventing electrical impulses from dissipating as they travel along the nerve fiber.
⪢This insulation allows for faster and more efficient transmission of electrical signals through a process called saltatory conduction.
⪢ Myelin also plays a role in maintaining the integrity of signal conduction and protecting the axon from external disturbances.
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This question is from ATI TEAS 7 Science~2024 Exam 1 which contains 50 questions.
More Questions from This Exam
Hikers who found a human body at high altitude in the Italian Alps thought the man had died recently, but tests indicated he was shot with an arrow more than 5,300 years ago. Which of the following would be the best reason for prolonged preservation of the body
Answer Choices:
A. The ultraviolet rays at such a high altitude caused all his molecules to be preserved.
B. The food that the person ate contained toxins that killed the bacteria that would have otherwise destroyed the body.
C. The body was frozen in the cold temperature of the Alps shortly after he died and remained frozen until it was found.
D. The arrow wound caused blood to flow out of the body which led the enzymes that would break down tissue to be cleared from the body.
Experiments cannot validate hypotheses, only falsify them. The statement above can be restated in which of the following ways.
Answer Choices:
A. Until disproved, an explanation for an observation is valid.
B. Certain concepts cannot be subjected to direct experimentation.
C. A hypothesis that has not been falsified remains provisional.
D. Proving a hypothesis exempts it from further testing
In which of the following regions of the body are the tibia and fibula?
Answer Choices:
A. Coxal
B. Antecubital
C. Tarsal
D. Crural
Which of the following occurs in an oxidation reaction?
Answer Choices:
A. Removal of oxygen
B. Addition of carbon
C. Addition of neutrons
D. Removal of electrons
Question Details
- Category: ATI TEAS
- Subcategory: Science Exam(s)
- Domain: Science~2024
- Answer Choices: 4