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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 A

Explanation

A. This allows for rapid exchange of oxygen and nutrients: Capillaries have thin walls (one cell thick) to facilitate the rapid diffusion of gases (oxygen and carbon dioxide), nutrients, and waste products between blood and tissues.

B. This allows for red blood cell formation to occur: Red blood cells are formed in the bone marrow, not in capillaries.

C. There is no blood pressure within the capillaries: There is still blood pressure within capillaries, although it is lower than in arteries, so this is incorrect.

D. Blood does not travel through capillaries: Blood does indeed travel through capillaries as part of the circulatory system.

Correct Answer is A

Explanation

A. Marrow: The hollow spaces within long bones contain bone marrow, which is responsible for the production of blood cells.

B. Natural killer cells: Natural killer cells are a type of lymphocyte found in the bloodstream and tissues but not directly within the hollow spaces of bones.

C. Enzymes: Enzymes are not found specifically in the hollow spaces of long bones; they are present throughout the body and are involved in metabolic processes.

D. Plasma cells: Plasma cells are derived from B cells and are primarily located in lymphatic tissue and bone marrow but do not fill the hollow spaces of long bones.

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