Which type of capillary may lead into meandering vessels or bundles of long straight vessels known as vascular sinuses?

• A. Continuous capillaries
• B. Lymphatic capillaries
• C. Fenestrated capillaries
• D. Sinusoidal capillaries

Answer: (D)

Verified step by step guidance

1. Understand the structure and function of capillaries: Capillaries are small blood vessels that facilitate the exchange of nutrients, gases, and waste between blood and tissues. There are different types of capillaries based on their permeability and structure: continuous, fenestrated, and sinusoidal.
2. Learn about sinusoidal capillaries: Sinusoidal capillaries are specialized capillaries with large gaps between endothelial cells, allowing the passage of large molecules and cells. They are found in organs like the liver, spleen, and bone marrow, where extensive exchange of substances occurs.
3. Recognize the unique feature of sinusoidal capillaries: These capillaries often lead into meandering vessels or bundles of long straight vessels known as vascular sinuses. This structure supports their role in filtering and modifying blood components.
4. Compare sinusoidal capillaries to other types: Continuous capillaries have tightly joined endothelial cells, limiting permeability. Fenestrated capillaries have small pores for moderate exchange. Lymphatic capillaries are part of the lymphatic system and not directly involved in vascular sinuses.
5. Conclude why sinusoidal capillaries are the correct answer: Their structure and function align with the description of leading into vascular sinuses, making them distinct from other capillary types.