Asked by Shelby McCasland on May 09, 2024
Verified
The structure of a capillary wall differs from that of a vein or artery because
A) the capillary wall has only two tunics.
B) capillaries have more smooth muscle.
C) capillary walls have only endothelium and a basement membrane.
D) capillaries can constrict or dilate.
E) capillaries are impermeable to all substances.
Capillary Wall
The thin, permeable layer of tissue that forms the boundary of capillaries, allowing for the exchange of gases, nutrients, and waste between blood and tissues.
Endothelium
The thin layer of cells that lines the interior surface of blood vessels and lymphatic vessels.
Basement Membrane
The basement membrane is a thin, fibrous layer that lies between the epithelium and the underlying connective tissue, providing support and anchorage.
- Comprehend the architecture and role of capillaries within the circulatory system.
Verified Answer
EA
Eiynna AbdahMay 16, 2024
Final Answer :
C
Explanation :
Capillary walls consist only of endothelium and a thin basement membrane, making them uniquely suited for the exchange of gases and nutrients between blood and tissues. Unlike veins and arteries, they lack multiple tunics or layers and smooth muscle, and they do not constrict or dilate to the same extent. Capillaries are also selectively permeable, allowing certain substances to pass through.
Learning Objectives
- Comprehend the architecture and role of capillaries within the circulatory system.