which neurotransmitter is responsible for stimulating muscle contraction

ATI TEAS 7

TEAS 7 science practice

1. Which neurotransmitter is responsible for stimulating muscle contraction?

A. Dopamine
B. Acetylcholine
C. Serotonin
D. Norepinephrine

Correct answer: B

Rationale: Acetylcholine is the neurotransmitter responsible for stimulating muscle contraction at the neuromuscular junction. When an action potential reaches the end of a motor neuron, acetylcholine is released into the synaptic cleft and binds to receptors on the muscle cell membrane, leading to muscle contraction. Dopamine, serotonin, and norepinephrine are neurotransmitters that have different functions in the nervous system and are not directly involved in stimulating muscle contraction. Dopamine is involved in reward and pleasure pathways, serotonin regulates mood and behavior, and norepinephrine is involved in the 'fight or flight' response.

2. Simplify the expression: 2x + 3x - 5.

A. 5x - 5
B. 5x
C. x - 5
D. 2x - 5

Correct answer: A

Rationale: To simplify the expression 2𝑥 + 3𝑥 - 5, follow these steps: Identify and combine like terms. The terms 2𝑥 and 3𝑥 are both 'like terms' because they both contain the variable 𝑥. Add the coefficients of the like terms: 2𝑥 + 3𝑥 = 5𝑥. Simplify the expression. After combining the like terms, the expression becomes 5𝑥 - 5, which includes the simplified term 5𝑥 and the constant -5. Thus, the fully simplified expression is 5𝑥 - 5, making Option A the correct answer. This method ensures all terms are correctly simplified by combining similar elements and retaining constants.

3. Which word is a synonym for 'brief'?

A. Short
B. Long
C. Detailed
D. Wordy

Correct answer: A

Rationale: 'Short' is the correct answer because it is a synonym for 'brief,' meaning concise or not lengthy. 'Long' (Choice B) is the opposite of 'brief.' 'Detailed' (Choice C) and 'Wordy' (Choice D) both imply a level of depth or excess information, making them incorrect choices.

4. Which of the following sentences correctly uses parallel structure?

A. She likes hiking, swimming, and to run.
B. She likes hiking, swimming, and running.
C. She likes hiking, to swim, and running.
D. She likes hiking, and she likes swimming and running.

Correct answer: B

Rationale: The correct answer is B. Parallel structure ensures that items in a series or list are in the same grammatical form. In choice A, 'to run' disrupts the parallel structure since 'hiking' and 'swimming' are gerunds. Choice C similarly breaks the parallelism by using 'to swim' in a different form. Choice D is incorrect because it lacks consistent parallelism, as 'hiking' is not followed by gerunds like 'swimming' and 'running.' Therefore, only choice B maintains proper parallel structure by using gerunds ('hiking,' 'swimming,' and 'running') consistently.

5. Which of the following organs is responsible for producing bile?

A. Pancreas
B. Liver
C. Gallbladder
D. Stomach

Correct answer: B

Rationale: The correct answer is B: Liver. The liver is responsible for producing bile, which aids in fat digestion. The pancreas produces digestive enzymes, the gallbladder stores bile produced by the liver, and the stomach primarily secretes gastric acid for digestion. Therefore, choices A, C, and D are incorrect as they do not directly produce bile.