The items below are all structural parts of blood vessels. 1 collagen fibres 2 elastic fibres 3 endothelial cells 4 smooth muscle cells Which row shows the components found in an artery and a vein?
- Aartery: 1, 2 and 4; vein: 1, 3 and 4
- Bartery: 2, 3 and 4; vein: 1, 3 and 4
- Cartery: 1, 2, 3 and 4; vein: 1, 2, 3 and 4
- Dartery: 1, 2, 3 and 4; vein: 2, 3 and 4