A myocardial infarction affects which of the following blood vessels of the heart?  

A. Coronary

B. Aorta

C. Pulmonary

D. Vena cava

Answer Explanation:

A myocardial infarction affects the coronary blood vessels of the heart.

A myocardial infarction, commonly known as a heart attack, occurs when blood flow decreases or stops in the coronary artery of the heart, causing damage to the heart muscle 1.

Choice B is incorrect because the aorta is not a blood vessel of the heart.

The aorta is the main artery that carries oxygenated blood from the heart to the rest of the body.

Choice C is incorrect because the pulmonary blood vessels are not affected by a myocardial infarction.

The pulmonary blood vessels carry deoxygenated blood from the heart to the lungs.

Choice D is incorrect because the vena cava is not a blood vessel of the heart.

The vena cava is a large vein that carries deoxygenated blood from the body to the heart.

Therefore, the Correct Answer is A.

Q #1: 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? .

A. The food that the person ate contained toxins that killed the bacteria that would have otherwise destroyed the body

B. The arrow wound caused blood to flow out of the body, which led the enzymes that would break down tissue to be cleared from the body

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

D. The ultraviolet rays at such a high altitude caused all the body's molecules to be preserved.

Answer Explanation

The best reason for the prolonged preservation of the body is that it was frozen in the cold temperature of the Alps shortly after he died and remained frozen until it was found.

Freezing can preserve a body by slowing down or stopping the decomposition process.

Choice A is not correct because the food that the person ate would not have contained toxins that killed the bacteria that would have otherwise destroyed the body.

Choice B is not correct because the arrow wound would not have caused blood to flow out of the body in a way that would have cleared enzymes that break down tissue from the body.

Choice D is not correct because ultraviolet rays at high altitude would not have caused all of the body’s molecules to be preserved.
Q #2: Which of the following substances is excreted by sweat glands in response to the breakdown of proteins and the formation of ammonia?

A. Urea

B. Sebum

C. Water

D. Lysozymes

Answer Explanation

Urea is a substance that is excreted by sweat glands in response to the breakdown of proteins and the formation of ammonia.

When proteins are broken down, they produce ammonia, which is a highly toxic compound for the body.

Ammonia is then converted into urea and released out of the body through sweat glands.

Choice B.

Sebum is not correct because it is an oily substance secreted by sebaceous glands to lubricate and protect the skin, but it is not related to the breakdown of proteins or the formation of ammonia.

Choice C.

Water is not correct because while it is a component of sweat, it is not specifically related to the breakdown of proteins or the formation of ammonia.

Choice D.

Lysozymes are not correct because they are enzymes found in tears, saliva and other body fluids that have antibacterial properties, but they are not related to the breakdown of proteins or the formation of ammonia.
Q #3: Testosterone is categorized as which of the following types of hormones?

A. Estrogen

B. Progestin

C. Aldosterone

D. Androgen

Answer Explanation

Testosterone is classified as an androgen hormone.

Androgens are a type of sex hormone that primarily regulates the development and maintenance of male characteristics, such as body hair growth, muscle mass, and deepening of the voice.

Testosterone is produced primarily in the testes in males and in smaller amounts in the ovaries and adrenal glands in females.

Option A, estrogen, is a female hormone that regulates the development of female sexual characteristics, such as breast growth and menstruation.

While estrogen and testosterone are both steroid hormones and can be converted to one another in the body, testosterone is not categorized as estrogen.

Option B, progestin, is a synthetic form of the hormone progesterone.

Progesterone is a female hormone that plays a role in the menstrual cycle and pregnancy.

Testosterone and progestin are not related, and testosterone is not categorized as progestin.

Option C, aldosterone, is a mineralocorticoid hormone that regulates salt and water balance in the body.

It is produced in the adrenal gland and plays a role in regulating blood pressure.

Testosterone and aldosterone are not related, and testosterone is not categorized as aldosterone.

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A myocardial infarction affects which of the following blood vessels of the heart?

More Questions on TEAS 7 Science

Q #1: 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? .

Answer Explanation

Q #2: Which of the following substances is excreted by sweat glands in response to the breakdown of proteins and the formation of ammonia?

Answer Explanation

Q #3: Testosterone is categorized as which of the following types of hormones?

Answer Explanation

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A myocardial infarction affects which of the following blood vessels of the heart? &nbsp;

More Questions on TEAS 7 Science

Q #1: 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? .

Answer Explanation

Q #2: Which of the following substances is excreted by sweat glands in response to the breakdown of proteins and the formation of ammonia?

Answer Explanation

Q #3: Testosterone is categorized as which of the following types of hormones?

Answer Explanation

Free Access on TEAS 7 Exams and Study Notes

TEAS 7 Exams (Q&A)

TEAS 7 Study Notes

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A myocardial infarction affects which of the following blood vessels of the heart?