Multiple choice

In a human blood, lymphocytes are small white blood cells that play a large role in defending the body against diseases. The specialised cell type involved in the entry of lymphocytes into lymph nodes are known as

  1. M cells

  2. mesangial cells

  3. PALS

  4. HEV endothelial cells

  5. selectins

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The high-walled endothelium of the post-capillary venules (HEV) in lymph nodes express vascular addressins, which are recognised by homing receptors on lymphocytes passing through the afferent lymphatics and which mediate entry of the lymphocytes into the lymph nodes.