Muscle Physiology Flashcard

Front

Which of the following is not characteristic of smooth muscle?
Smooth muscle cells are uninucleate.
Smooth muscles do not contain sarcomeres.
The striations are due to the orderly arrangement of actin and myosin.
Neurons that innervate smooth muscles are under involuntary control.
The thin filaments of smooth muscle fibers are attached to dense bodies.

Back

The striations are due to the orderly arrangement of actin and myosin.

Front

Which of the following allows muscles to return to their original shape during relaxation? Opposing muscle contractions, Myosin binding, Gravity, opposing muscle contractions, and elastic forces, Elastic forces, gravity

Back

Gravity, opposing muscle contractions, and elastic forces

Front

Creatine phosphate acts as what in muscle tissue?

Back

Acts as an energy reserve in muscle tissue.

Front

The type of contraction where the tension is less than the load is called

Back

Isotonic eccentric contraction.

Front

The increase in muscle tension that is produced by increasing the number of active motor units is called

Back

Recruitment.

Front

At each end of the muscle, the collagen fibers of the epimysium, perimysium, and endomysium, come together to form a

Back

tendon.

Front

The repeating unit of a skeletal muscle fiber is the

Back

sarcomere.

Front

When a skeletal muscle fiber contracts, the

Back

zones of overlap get larger.

Front

Each thin filament consists of

Back

two actin protein strands coiled helically around each other.

Front

Skeletal muscle fibers are formed from embryonic cells called

Back

myoblasts.