Final answer:
The concept of recruitment, as it pertains to muscle cells, does not apply to single-unit smooth muscle cells, which contract as a synchronized unit; thus, the statement in question is false.
Step-by-step explanation:
Recruitment is not an option in a single-unit smooth muscle cell. Smooth muscle can be classified into two types: single-unit and multiunit. In single-unit smooth muscle tissue, cells are electrically coupled through gap junctions, allowing for synchronized contractions as a single unit. Examples of single-unit smooth muscle include the smooth muscle in the walls of the viscera, such as the uterus or intestines. In contrast, multiunit smooth muscle cells do not possess gap junctions, and contraction is confined to the stimulated cell only.
Recruitment refers to the ability of a muscle to strengthen its contraction by increasing the number of active motor units. In the context of smooth muscle cells, especially the single-unit smooth muscle cells, recruitment is not a typical mechanism. Unlike skeletal muscles that can recruit additional motor units to enhance contraction strength, single-unit smooth muscle cells are connected by gap junctions and contract as a single unit when stimulated. These cells do not rely on recruitment to augment contractive force. Therefore, the statement 'Recruitment is an option in a single-unit smooth muscle cell' is false.