Smooth Muscles Quiz

What shape are smooth muscle fibers?

• Flat

• Spindle-shaped

• Cylindrical

• Cuboidal

What is the range of length for smooth muscle fibers?

• 10um to 100um

• 20um to 500um

• 50um to 1000um

• 5um to 50um

Where is the nucleus located in smooth muscle fibers?

• In the center of the wide portion

• At the tapered ends

• Scattered throughout

• At one end

What structure allows adjacent smooth muscle fibers to attach?

• Desmosomes

• Nexuses

• Tight junctions

• Gap junctions

Which organelles are mainly located near the nucleus in smooth muscle fibers?

• Mitochondria

• Lysosomes

• Centrioles

• Peroxisomes

What is the function of caveolae in smooth muscle fibers?

• Increase surface area

• Contact with SER

• Facilitate communication

• Store calcium

From what do all muscle fibers derive?

• Myoblasts

• Fibroblasts

• Stem cells

• Satellite cells

Can skeletal and cardiac muscle fibers divide?

• Yes, under stress

• No, they lack centrosomes

• Only in embryos

• Yes, easily

What type of cells are satellite cells?

• Differentiated muscle cells

• Undifferentiated cells

• Nerve cells

• Connective tissue cells

What happens to satellite cells under certain conditions?

• They divide and differentiate

• They migrate

• They die

• They become fat cells