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 B

Explanation

The layer of skin that lacks blood vessels is the epidermis. The epidermis is the thin outer layer of the skin and does not have any blood vessels within it. It is composed of keratinized, stratified squamous epithelium and is made of four or five layers of epithelial cells, depending on its location in the body.

The other options are not correct because they do contain blood vessels. The papillary layer is part of the dermis, which contains blood vessels ¹. The reticular layer is also part of the dermis and contains blood vessels. The hypodermis is a layer below the dermis and also contains blood vessels.

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

Which of the following layers of skin lack blood vessels?

Correct Answer is B

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

Which of the following properties does soap, an emulsifier, have that make it useful for washing dirt oﬀ one’s handswith water?

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