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

A. Aorta

B. Vena cava

C. Pulmonary

D. Coronary

Answer Explanation:

A myocardial infarction refers to heart attack, which result from blockage of blood flowing into the heart.

Blocking is caused by the deposition of fat or cholesterol that forms plaque on the surface of coronary arteries, which supply blood to the heart.

Therefore, the Correct Answer is D.

Q #1: Which of the following statements best supports the hypothesis that viruses can cause cancer?

A. Cellular DNA has sequences related to viral sequences

B. Cancerous and normal cells share genetic sequences

C. Genes that regulate cell division are found in some viruses

D. Viruses and cancer cells both replicate rapidly

Answer Explanation

Cancer is a condition caused by unregulated division of abnormal cells in parts of the body. For a virus to survive in an organism, it must enter into the host’s cell and take control of the cell’s most activities in order to be able to reproduce and replicate.

Some of the viruses achieve this by inserting their DNA or RNA to that of the host cell. This has a highly likelihood of affecting the DNA or RNA of a host (living organism) which alters their genes, which may lead to host cells becoming cancerous.

For this reason, viruses can cause cancer because the genes that regulate cell division in host cell are found in some viruses.
Q #2: Which of the following best describes the result of using a catalyst in a chemical reaction?

A. A more desirable product is often formed

B. The reaction is completed in a shorter amount of time

C. The yield of product is increased

D. A greater amount of energy is released by the reaction

Answer Explanation

A catalyst is substance that speeds up the rate of converting reactants to products. They do by decreasing the activation energy of a reaction. If a catalyst increases the rate of reaction, then it means that the reaction takes a smaller time to come into completion.
Catalysts can be metals, ions or biological also known as enzymes. Catalysts are not consumed when the reaction is taking place.
Q #3: Which of the following indicates the function of sodium bicarbonate released by the pancreas?

A. Sodium bicarbonate inhibits peristalsis

B. Sodium bicarbonate is a protease that digests carbohydrates

C. Sodium bicarbonate stimulates the pyloric sphincter

D. Sodium bicarbonate neutralizes the acidity of chyme

Answer Explanation

Sodium bicarbonate is an alkaline solution, which is released by the pancreas. Chyme is acidic coming from the stomach is neutralized by sodium bicarbonate to protect the duodenum.

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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: Which of the following statements best supports the hypothesis that viruses can cause cancer?

Answer Explanation

Q #2: Which of the following best describes the result of using a catalyst in a chemical reaction?

Answer Explanation

Q #3: Which of the following indicates the function of sodium bicarbonate released by the pancreas?

Answer Explanation

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