what is the myelin sheath and what does it do
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Nursing Elites

ATI TEAS 7

ATI TEAS 7 science review

1. What is the myelin sheath and what does it do?

Correct answer: B

Rationale: The myelin sheath is a fatty substance that insulates some nerve fibers. It is made up of specialized cells that wrap around the axons of neurons, providing insulation and speeding up the transmission of nerve impulses. Choice A is incorrect as the myelin sheath is not a group of nerve cells but rather a substance that surrounds nerve fibers. Choice C is incorrect as the myelin sheath is not a fluid-filled cavity within the brain. Choice D is incorrect as the myelin sheath is not the junction between two neurons.

2. What type of energy does a stretched rubber band possess?

Correct answer: B

Rationale: When a rubber band is stretched, it stores potential energy due to its position or configuration. This potential energy can be converted into kinetic energy when the rubber band is released and returns to its original shape. Therefore, the correct answer is potential energy, as the energy is stored in the stretched rubber band and can be released upon returning to its original state. Choices A, C, and D are incorrect because kinetic energy is associated with motion, thermal energy is related to heat, and mechanical energy is a broader category that includes both potential and kinetic energy.

3. Which of the following correctly describes mitosis?

Correct answer: B

Rationale: The correct answer is B. Mitosis occurs in somatic cells where a single cell divides to produce two identical daughter cells. Germ cells undergo meiosis, not mitosis. Choice C is incorrect as mitosis results in the preservation of the same chromosome number in daughter cells. Choice D is inaccurate as mitosis produces genetically identical cells, not genetically different ones.

4. What units of measurement would a triple beam balance show?

Correct answer: B

Rationale: A triple beam balance is used to measure mass, typically in grams. Liters, meters, and gallons are units of volume, length, and capacity, respectively, not typically measured using a triple beam balance. Therefore, the correct answer is grams. Choice A, Liters, is a unit of volume. Choice C, Meters, is a unit of length. Choice D, Gallons, is a unit of capacity. These units are not typically measured using a triple beam balance.

5. Which of the following battles occurred first?

Correct answer: D

Rationale: Shiloh occurred earlier than the other battles listed. Shiloh took place in April 1862 during the American Civil War, making it the earliest battle among the options provided. Cold Harbor occurred in June 1864, Chancellorsville in May 1863, and Atlanta in July-September 1864. Therefore, Shiloh is the correct answer. Choice A (Cold Harbor) is incorrect because it happened after Shiloh. Choice B (Chancellorsville) is incorrect because it occurred after Shiloh. Choice C (Atlanta) is also incorrect as it took place after Shiloh.

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