Smooth Muscle Tissue Characteristics

This video by Ben from registerednersharin.com covers smooth muscle tissue, the third type of muscle tissue. It explains the locations, structure, and characteristics of smooth muscle, including its fusiform shape and single nucleus. The video discusses the layers of smooth muscle in organs and their role in functions like peristalsis. It also covers the contraction mechanism, highlighting the absence of sarcomeres and myofibrils. The video distinguishes between single-unit and multi-unit smooth muscle, explaining their innervation and function. Finally, it offers resources for further learning.

What mnemonic is used to remember the main locations of smooth muscle tissue?

• BONES

• MUSCLE

• STOVE

• HEART

Which shape best describes smooth muscle cells?

• Square

• Fusiform

• Branched

• Cylindrical

What is the role of the longitudinal layer in the digestive system?

• To constrict the organ

• To absorb water

• To propel food down the tract

• To store nutrients

Which muscle tissue type can be controlled voluntarily?

• Smooth

• All of the above

• Cardiac

• Skeletal

What is absent in smooth muscle tissue that is present in skeletal and cardiac muscle?

• Actin filaments

• Myofibrils

• Endomysium

• Nuclei

What are dense bodies in smooth muscle cells analogous to in skeletal muscle?

• Nuclei

• Myofibrils

• Sarcomeres

• Z discs

What mechanism is used by smooth muscle to contract?

• Isometric contraction

• Twitch contraction

• Cross-bridge cycling

• Sliding filament mechanism

What is a characteristic of single-unit smooth muscle?

• Requires multiple nerve fibers

• Lacks gap junctions

• Found in the heart

• Contracts in unison

Where is multi-unit smooth muscle primarily found?

• Intestines

• Skin

• Liver

• Heart

How does the electrical impulse spread in single-unit smooth muscle?

• Through multiple nerve fibers

• Via gap junctions

• By direct contact

• Through chemical signals