It's not some amazing thing that the senior officials of the executive departments " just happen to be" the President's advisors on matters relating to their departments; it's more that the President appoints people whose opinions he trusts to be department heads.
The term "Cabinet" was used starting in the 1600s for a small private room where advisors could meet, and came to apply to a group of advisors themselves. It's not defined in the US Constitution, it's just a continued usage of what had come to be a common and widely understood term.
the heads of major departments in the executive branch
the heads of major departments in the executive branch
They are called department heads and together they form the presidents cabinet.
The department heads, known as secretaries make up the President's cabinet.
the Cabinet.
Heads of executive departments are nominated by the President subject to the approval of Congress.
Executive
The Senate must approve the heads of the cabinet departments.
The department heads, known as secretaries make up the President's cabinet.
The department heads, known as secretaries make up the President's cabinet.
There are more than 1.4 million other people in the executive branch. The heads of departments are the cabinet secretaries, plus some other cabinet level officials.
The heads of the federal executive departments, known as secretaries of their respective department, form the traditional Cabinet, an executive organ that serves at the disposal of the president and normally act as an advisory body to the presidency. Therefore they report to the president.