Muscular Tissues: 34 MCQs with answers

Movement and locomotion

Muscular tissue is specialized for contraction, which produces movement and locomotion.

Skeletal muscle

Skeletal muscle is under conscious (voluntary) control, unlike smooth and cardiac muscles.

Smooth muscle

Smooth muscle is present in the walls of hollow internal organs like the stomach and intestines.

Cardiac muscle

Cardiac muscle contracts rhythmically to pump blood, and it is involuntary.

False

Cardiac muscle is involuntary; it contracts without conscious control.

True

Smooth muscle is present in the walls of blood vessels and helps regulate blood flow.

Skeletal muscle

Skeletal muscle is the only type of muscle tissue that is under voluntary control, allowing for conscious movement.

Cardiac muscle

Cardiac muscle is specifically located in the heart and is responsible for its rhythmic contractions.

Spindle-shaped and uninucleate

Smooth muscle cells are spindle-shaped and have a single nucleus, distinguishing them from skeletal and cardiac muscle cells.

To enable movement

The primary function of muscular tissue is to enable movement, maintain posture, and generate heat.

Cardiac muscle

Intercalated discs are unique to cardiac muscle, facilitating rapid electrical signal transmission for coordinated contractions.

Long and cylindrical

Skeletal muscle fibers are long and cylindrical, which allows for effective contraction and movement.

Involuntary

Smooth muscle is under involuntary control, meaning its contractions are not consciously controlled.

Sarcomere

The sarcomere is the functional unit of a muscle fiber, responsible for muscle contraction.

Smooth muscle

Smooth muscle lacks striations, making it distinct from both skeletal and cardiac muscle.

To trigger contraction

Calcium ions trigger muscle contraction by binding to troponin, which allows myosin to interact with actin.

Smooth muscle

Smooth muscle is characterized by spindle-shaped cells, which are uninucleate and lack striations.

Cardiac muscle

Cardiac muscle is the type of muscle tissue found exclusively in the walls of the heart.

Voluntary movement

The primary function of skeletal muscle is to facilitate voluntary movement, allowing conscious control over muscle actions.

Contractility

Contractility refers to the unique ability of muscle tissue to shorten forcefully, enabling movement.

Smooth muscle

Smooth muscle is characterized by being involuntary and lacking striations, making it distinct from skeletal and cardiac muscle.

Involuntary control

Cardiac muscle operates under involuntary control, meaning its contractions are not consciously controlled.

Long and cylindrical

Skeletal muscle fibers are long and cylindrical, which allows for effective contraction and force generation.

Presence of intercalated discs

Cardiac muscle cells are unique for having intercalated discs, which facilitate rapid electrical signal transmission for coordinated contractions.

Smooth muscle

Smooth muscle is responsible for peristalsis, the involuntary movement that propels contents through hollow organs.

Skeletal muscle

Skeletal muscle is characterized by its multinucleate structure, which is essential for its function and repair.

It is striated and involuntary

Cardiac muscle is striated like skeletal muscle but functions involuntarily.

Both actin and myosin

The alternating arrangement of actin and myosin filaments gives skeletal muscle its striated appearance.

Sarcomere

The sarcomere is the basic contractile unit of a muscle fiber.

It is non-striated and involuntary

Smooth muscle lacks striations and is not under conscious control.

Moving food through the digestive tract

Smooth muscle in the digestive tract helps propel food through peristalsis.

Skeletal muscle is voluntary; cardiac muscle is involuntary

Skeletal muscle is under conscious control, while cardiac muscle contracts involuntarily.

They are multinucleated and striated

Skeletal muscle fibers are multinucleated and show striations due to the arrangement of actin and myosin.

They bind to troponin and allow actin-myosin interaction

Calcium ions bind to troponin, causing tropomyosin to move and exposing actin-binding sites for myosin.