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Where is blood pressure the highest?

A.

Superior vena cava

B.

Ascending aorta

C.

Abdominal aorta

D.

Pulmonary trunk

Answer and Explanation

The Correct Answer is B

A. Superior vena cava: The superior vena cava carries deoxygenated blood back to the heart, and pressure here is low.

B. Ascending aorta: The ascending aorta is where blood is ejected from the left ventricle, leading to the highest pressure in the circulatory system.

C. Abdominal aorta: While the pressure is still high in the abdominal aorta, it is lower compared to the ascending aorta.

D. Pulmonary trunk: The pulmonary trunk carries blood to the lungs, and the pressure is lower compared to the systemic circulation.


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Related Questions

Correct Answer is C

Explanation

A. Prostate: The prostate gland contributes to the semen volume but only about 20-30%. It produces a fluid that nourishes sperm and helps transport them but is not the primary contributor to the total volume of semen.

B. Ductus Deferens: The ductus deferens (vas deferens) is a tube that transports sperm from the epididymis to the ejaculatory duct. It does not produce or contribute to the volume of semen.

C. Seminal Vesicle: The seminal vesicles contribute approximately 60% of the total semen volume. They secrete a fluid that is rich in fructose and other substances that provide energy for sperm and help in the formation of semen.

Correct Answer is C

Explanation

A. It increases blood pressure, leading to a heart attack or stroke: This is not the primary mechanism of carbon monoxide poisoning.

B. It causes an increase in carbon dioxide, which causes an increase in pH: This is incorrect. Carbon monoxide binds to hemoglobin more tightly than oxygen, not carbon dioxide.

C. It occupies oxygen-binding sites on hemoglobin and decreases the amount of oxygen that reaches the tissues: Carbon monoxide has a high affinity for hemoglobin, leading to reduced oxygen transport in the blood, which can cause tissue hypoxia and death.

D. It causes inflammation within the bronchioles and prevents air from reaching the alveoli: This is incorrect; carbon monoxide poisoning does not work by causing inflammation.

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