hub

noun hub

• nerve center — a group of nerve cells closely connected with one another and acting together in the performance of some function.
• heart — Anatomy. a hollow, pumplike organ of blood circulation, composed mainly of rhythmically contractile smooth muscle, located in the chest between the lungs and slightly to the left and consisting of four chambers: a right atrium that receives blood returning from the body via the superior and inferior vena cavae, a right ventricle that pumps the blood through the pulmonary artery to the lungs for oxygenation, a left atrium that receives the oxygenated blood via the pulmonary veins and passes it through the mitral valve, and a left ventricle that pumps the oxygenated blood, via the aorta, throughout the body.
• core — The core of a fruit is the central part of it. It contains seeds or pips.
• focus — a central point, as of attraction, attention, or activity: The need to prevent a nuclear war became the focus of all diplomatic efforts.
• seat — something designed to support a person in a sitting position, as a chair, bench, or pew; a place on or in which one sits.