Smooth muscle

This tutorial by Nicole from Kenhub explores smooth muscle, a type of involuntary muscle tissue. It covers the locations and functions of smooth muscle in the body, such as in the gastrointestinal and respiratory tracts, uterus, eye, and blood vessels. The histology section details the structure and composition of smooth muscle, highlighting its unique features compared to other muscle types. The tutorial also examines the role of smooth muscle in hollow organs and discusses related disorders. A clinical note on multisystemic smooth muscle dysfunction syndrome is included, followed by a recap of key points.

Which type of muscle tissue is known for its involuntary control?

• Skeletal muscle

• Connective tissue

• Cardiac muscle

• Smooth muscle

Where can smooth muscle be found in the body?

• Attached to bones

• In the heart

• In the walls of hollow organs

• In the skin

What is the primary function of smooth muscle in the blood vessels?

• To store nutrients

• To initiate voluntary movement

• To regulate blood vessel diameter

• To pump blood

What is the role of gap junctions in smooth muscle cells?

• To initiate contraction

• To produce energy

• To connect cells for communication

• To store calcium

How do smooth muscle cells differ from skeletal muscle cells in appearance?

• Smooth muscle cells are non-striated

• Smooth muscle cells have sarcomeres

• Smooth muscle cells are striated

• Smooth muscle cells have multiple nuclei

What is the function of the circular muscle layer in the gastrointestinal tract?

• To reduce the width of the lumen

• To increase the width of the lumen

• To store nutrients

• To produce digestive enzymes

What is the myenteric plexus responsible for?

• Controlling blood pressure

• Regulating heart rate

• Controlling intestinal motility

• Initiating voluntary movement

What genetic mutation is associated with multisystemic smooth muscle dysfunction syndrome?

• BRCA1 gene mutation

• TP53 gene mutation

• ACTA2 gene mutation

• CFTR gene mutation

What symptom is NOT associated with multisystemic smooth muscle dysfunction syndrome?

• Weakening of the bladder

• Abnormalities in blood vessel walls

• Increased muscle strength

• Gastrointestinal problems

What is the main distinguishing feature of smooth muscle compared to other muscle types?

• Striated appearance

• Presence of sarcomeres

• Non-striated appearance

• Multiple nuclei per cell