Examlex
The sinoatrial node is sometimes called the pacemaker of the heart.
Elongation
The process of lengthening or stretching something, commonly referring to the lengthening of molecular chains or the physical body structure.
Axis
A line or reference around which something rotates or is symmetrically arranged, often used in geometry and physics to describe orientation.
Hormone
A naturally occurring compound in the body that directs and controls the operation of specific cells or organs.
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