A & P Chapter 10.2 - 10.3 notes

Identify the structure where ATP is produced.

1 (mitochondria)

Where are the myosin molecules located?

5

The region of the sarcomere containing the thick filaments is the

A band

The skeletal muscle complex known as the triad consists of

A transverse tubule and two terminal cisternae.

The protein that is found in the Z line of a sarcomere is called

Actinin

What physiological process occurs in the structure labeled "7" (T Tubules)?

Conduction of the action potential into the cell interior

Muscle fibers are directly surrounded by which thin layer of connective tissue?

Endomysium

The capillaries that wrap around each muscle fiber are located within the __________.

Endomysium

The delicate connective tissue that surrounds the skeletal muscle fibers and ties adjacent muscle fibers together is the

Endomysium

The dense layer of connective tissue that surrounds an entire skeletal muscle is the

Epimysium

The area in the center of the A band that contains no thin filaments is the

H band

Muscle fibers differ from "typical cells" in that muscle fibers

Have many nuclei

Each skeletal muscle fiber contains ________ myofibrils.

Hundreds to thousands

The region of the sarcomere that always contains thin filaments is the

I band

Interactions between actin and myosin filaments of the sarcomere are responsible for

Muscle contraction

Which of the following best describes the term titin?

Protein that accounts for elasticity of resting muscle

The plasma membrane of a skeletal muscle fiber is called the

Sarcolemma

The repeating unit of a skeletal muscle fiber is the

Sarcomere

Stem cells located between the endomysium and sarcolemma that function in the repair of damaged muscle tissue are called

Satellite cells

Since each myofibril is attached at either end of the muscle fiber, when sarcomeres shorten, the muscle fiber

Shortens

The structural theory that explains how a muscle fiber contracts is called the ________ theory.

Sliding filament

Which of the following best describes the term sarcoplasmic reticulum?

Storage and release site for calcium ions

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

Tendon

Which region of the sarcomere gives rise to the structure (band or line) indicated by the arrow (Z Line)?

The boundary between adjacent sarcomeres

Which region of the sarcomere gives rise to the structure (band or line) indicated by the arrow (M Line)?

The point of connection for adjacent tails of the thick filaments

Which region of the sarcomere gives rise to the structure (band or line) indicated by the arrow (H Band)?

The region of the resting sarcomere that only contains thick filaments

Which region of the sarcomere gives rise to the structure (band or line) indicated by the arrow (I Band)?

The region of the sarcomere that contains only thin filaments

Which of the following best describes the term Z line?

Thin filaments are anchored here

When a skeletal muscle fiber contracts, the

Zones of overlap get larger