What is the primary difference between multiunit smooth muscle and visceral smooth muscle?

• Structure and function

• Color and size

• Location and density

• Temperature and flexibility

What is one of the objectives related to cardiac and skeletal muscles?

• Compare their color

• Compare their contraction mechanism

• Compare their size

• Compare their density

What characteristic do smooth muscle cells lack?

• Striations

• Nuclei

• Cytoplasm

• Cell membrane

How are the filaments in smooth muscle cells arranged?

• In parallel lines

• In a grid pattern

• More randomly

• In concentric circles

What is relatively undeveloped in smooth muscle cells?

• Mitochondria

• Sarcoplasmic reticulum

• Golgi apparatus

• Ribosomes

What is a characteristic of multiunit smooth muscle?

• Fibers occur in sheets

• Found in the walls of hollow organs

• Found in blood vessels

• Stimulates peristalsis

Where is visceral smooth muscle typically found?

• In the blood vessels

• In the iris of the eye

• In the walls of hollow organs

• In the skin

What function does visceral smooth muscle perform in tubular organs?

• Contraction of blood vessels

• Peristalsis

• Reflex actions

• Hormone secretion

What is a similarity between smooth muscle contraction and skeletal muscle contraction?

• Only smooth muscle involves actin and myosin

• Both types use ATP energy

• Only skeletal muscle requires calcium ions

• Both types are not stimulated by membrane impulses

Which of the following is required for both smooth and skeletal muscle contractions?

• Increase in sodium ions in the cells

• Decrease in calcium ions in the cells

• Increase in calcium ions in the cells

• Decrease in potassium ions in the cells