myelin sheath a fatty substance insulates nerve fibers what type of tissue is the myelin sheath derived from

ATI TEAS 7

ati teas 7 science

1. From which type of tissue is the myelin sheath derived, a fatty substance that insulates nerve fibers?

A. Epithelial tissue
B. Muscle tissue
C. Nervous tissue (glial cells)
D. Connective tissue

Correct answer: C

Rationale: The myelin sheath, a fatty substance that insulates nerve fibers, is derived from nervous tissue, specifically glial cells. Glial cells, including oligodendrocytes in the central nervous system and Schwann cells in the peripheral nervous system, are responsible for producing the myelin sheath that surrounds and insulates nerve fibers, aiding in the conduction of nerve impulses. Epithelial tissue (Choice A), Muscle tissue (Choice B), and Connective tissue (Choice D) are not responsible for producing the myelin sheath; instead, nervous tissue (glial cells) plays this crucial role.

2. Which test is commonly used to assess kidney function?

A. Complete blood count (CBC)
B. Blood sugar test
C. Urinalysis
D. Creatinine clearance test

Correct answer: D

Rationale: The creatinine clearance test is commonly used to assess kidney function. Creatinine, a waste product produced by muscles, is filtered out of the blood by the kidneys. The creatinine clearance test measures how efficiently the kidneys clear creatinine from the blood. Abnormal levels of creatinine in the blood can indicate kidney dysfunction, making this test crucial for evaluating kidney function. Choice A, a complete blood count (CBC), provides information about different blood cells and is not a specific test for kidney function. Choice B, a blood sugar test, assesses glucose levels in the blood and is not directly related to kidney function. Choice C, a urinalysis, evaluates the contents of urine and can provide information about kidney health but is not as specific for assessing kidney function as the creatinine clearance test.

3. Which type of blood cell is responsible for clotting?

A. Red blood cells
B. Platelets
C. White blood cells
D. Plasma

Correct answer: B

Rationale: Platelets are responsible for blood clotting. They help prevent excessive bleeding by forming clots at the site of blood vessel injuries. Platelets release chemicals that initiate the clotting process, leading to the formation of a stable clot that stops bleeding. Red blood cells are primarily responsible for carrying oxygen throughout the body and do not play a direct role in clotting. White blood cells are part of the immune system, fighting off infections and foreign invaders. Plasma is the liquid component of blood that carries various substances such as nutrients, hormones, and waste products, but it is not directly involved in clotting.

4. Which of the following demonstrates correct punctuation of a quotation?

A. "You should have never invited Shane to that party," said Jessica, "if you didn't want him to run into Blayne."
B. "You should have never invited Shane to that party," said Jessica. "If you didn't want him to run into Blayne."
C. "You should have never invited Shane to that party," said Jessica, "if you didn't want him to run into Blayne."
D. "You should have never invited Shane to that party," said Jessica, "If you didn't want him to run into Blayne."

Correct answer: A

Rationale: Choice A is the correct answer as it demonstrates the correct punctuation of a quotation. In this sentence, the comma is correctly placed inside the quotation marks after 'party' and 'Blayne.' This follows the standard rule in punctuation where commas and periods should always be placed inside the closing quotation mark. Choices B, C, and D are incorrect. Choice B incorrectly places a period before the closing quotation mark after 'Jessica,' which is not necessary. Choice C misses a comma inside the quotation marks after 'party,' leading to incorrect punctuation. Choice D incorrectly capitalizes 'If' within the quotation, which is not part of the original sentence.

5. Robert plans to drive 1,800 miles. His car gets 30 miles per gallon, and his tank holds 12 gallons. How many tanks of gas will he need for the trip?

A. 4 tanks
B. 5 tanks
C. 6 tanks
D. 7 tanks

Correct answer: B

Rationale: To calculate how many gallons of gas Robert needs for the 1,800-mile trip, divide the total distance by the car's mileage per gallon: 1,800 miles ÷ 30 mpg = 60 gallons. Since his tank holds 12 gallons, Robert will need 60 gallons ÷ 12 gallons per tank = 5 tanks of gas for the trip. Choice A (4 tanks), Choice C (6 tanks), and Choice D (7 tanks) are incorrect as they do not correctly calculate the number of tanks needed based on the car's mileage and tank capacity.