(a(i))[1]
The innermost layer of a vein is the tunica intima, which consists of a single layer of endothelial cells that act as a protective barrier. If the tunica intima of a blood vessel is damaged, endothelial cells can undergo mitosis so that tissue repair can take place. The spindle formed during mitosis is made of spindle fibres. Name the cell structures that are arranged to form spindle fibres during mitosis.
(a(ii))[2]
Describe the telophase stage of mitosis.
(b)[3]
Explain the way in which a vein’s structure is linked to its function. You do not need to include details of the structure of the tunica intima or what it does.