Well technically yes, practically it would mean buy another laptop. The mobile cpus are very expensive and hard to come by and in a lot of laptops( mainly the big brands) core components are soldered in place. It pretty much means you can replace: - Memory - wifi / bluetooth - HDD/SSD - Optical drive
But thats about it.
PS: if you have a macbook you're pretty much fucked when you want te replace anything.
I never knew that. I thought it was just as easy as swapping out parts on a PC. Kinda makes me feel bad when I met my friends cousin and he said "I rebuild, repair and resell Laptops for a living" and I just looked at him like he said "You may find this hard to believe but I change my own video card"