Why do the walls of capillaries consist of only one layer?
This allows for rapid exchange of oxygen and nutrients.
This allows for red blood cell formation to occur.
There is no blood pressure within the capillaries.
Blood does not travel through capillaries.
The Correct Answer is A
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.
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Related Questions
Correct Answer is D
Explanation
A. Dendritic cells: Dendritic cells are antigen-presenting cells that originate from precursor cells in the bone marrow, but they do not differentiate from monocytes.
B. Bacterial cells: Bacterial cells are pathogens and do not differentiate into any immune cells.
C. Natural killer cells: Natural killer cells are a type of lymphocyte involved in the innate immune response but do not differentiate from monocytes.
D. Monocyte cells: Monocytes are a type of white blood cell that, upon migrating into tissues, differentiate into macrophages, which play a key role in phagocytosis and immune response.
Correct Answer is A
Explanation
A. Broad ligament: The broad ligament is a peritoneal fold that supports the uterus and attaches it to the lateral pelvic walls.
B. Adventitia: This is the outer connective tissue layer that supports the uterus but does not suspend it from the pelvic wall.
C. Round ligament: This ligament supports the uterus but primarily connects the uterus to the labia majora and does not suspend it from the lateral pelvic wall.
D. Ovarian fossa: This is a depression in the pelvic cavity that contains the ovaries, but it does not suspend the uterus.
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