Question

Single-unit smooth muscle cells are able to contract simultaneously in a coordinated manner. Aside from the digestive system, where else in the body would single-unit smooth muscle cells exist?

A) Uterus
B) Trachea
C) Blood vessels
D) Bladder

Answer 1

Single-unit smooth muscle cells are found in various hollow organs and passages beyond the digestive system including the urinary bladder, uterus, and blood vessels, where they perform coordinated contractions.

Step-by-step explanation:

Single-unit smooth muscle cells have the ability to coordinate contractions because they are connected by gap junctions. Aside from the digestive system, single-unit smooth muscle cells can also be found in the urinary bladder, uterus, blood vessels, and other hollow organs and tracts such as the respiratory, urinary, and reproductive systems. Single-unit smooth muscle is also referred to as visceral muscle owing to its presence in the walls of visceral organs. It is known for its slow, steady contractions and a stress-relaxation response that is crucial for maintaining the function and tone of these organs.