Context: The control unit, ALU, and registers are collectively known as a central processing unit (CPU). Early CPUs were composed of many separate components but since the mid-1970s CPUs have typically been constructed on a single integrated circuit called a microprocessor.

Question: The CPU is an abbreviation for what?
Answer: central processing unit

Question: What 3 parts make up the CPU?
Answer: The control unit, ALU, and registers

Question: CPUs that are constructed on a single integrated circuit are called what?
Answer: a microprocessor

Question: Since when have CPUs been constructed with a microprocessor?
Answer: mid-1970s