Which of the following is an eﬀerent neuron that is responsible for releasing a neurotransmiter that stimulates a muscle cell to contract?

Motor neuron

Interneuron

Sensory neuron

Neuroglia

Answer and Explanation

The Correct Answer is A

An eﬀerent neuron that is responsible for releasing a neurotransmitter that stimulates a muscle cell to contract is a motor neuron ². Motor neurons carry signals from the brain to the peripheral nervous system in order to initiate an action ⁴. The neurotransmitter acetylcholine (ACh) is released by motor neurons at the neuromuscular junction in skeletal muscle, causing the muscle to contract ³.

The other options are not correct because they do not accurately describe the type of neuron responsible for releasing a neurotransmitter that stimulates a muscle cell to contract. Interneurons are found within the central nervous system and facilitate communication between sensory and motor neurons. Sensory neurons carry information from sensory receptors to the central nervous system. Neuroglia are support cells for neurons and do not transmit nerve impulses.

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Correct Answer is C

Explanation

The correct answer is c. 100,000. The pH scale is a logarithmic scale, which means that each change of one pH unit represents a tenfold change in the hydrogen-ion concentration. A pH 4 solution has a hydrogen-ion concentration that is 10^5 (or 100,000) times greater than that of a pH 9 solution.

A. 0.00001 is the hydrogen-ion concentration of a pH 9 solution as compared with a pH 4 solution.

B. 5 is the diﬀerence in pH units between a pH 4 solution and a pH 9 solution.

D. 50 is not the correct answer.

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 C. destroyed the body. D. The body was frozen in the cold temperature of the Alps shortly after he died and remained frozen until

Correct Answer is D

Explanation

It was frozen in the cold temperature of the Alps shortly after death and remained frozen until it was found. Freezing can preserve a body by slowing down or stopping the decomposition process.

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Which of the following is an eﬀerent neuron that is responsible for releasing a neurotransmiter that stimulates a muscle cell to contract?

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Naxlex Comprehensive Predictor Exams

How many times stronger is the hydrogen-ion concentration of a pH 4 solution as compared with a pH 9 solution?

Correct Answer is C

Explanation

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?

Correct Answer is D

Explanation

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