Which Phrase Defines Smooth Muscle

Question

Which phrase defines smooth muscle?
A) used for slow, involuntary movements
B) used to move bones
C) beats the heart
D) shows striations
E) contains multi-nucleate cells

Accepted Answer

Smooth muscle is responsible for slow, involuntary movements, such as the contractions of the digestive tract or blood vessels.

Answer: E 
 Smooth muscle cells are uni-nucleate, meaning they contain only one nucleus per cell. This is different from skeletal muscle cells, which are multi-nucleate.