Ch 12 part 1 Muscle Contraction and Sarcomere Shortening Quiz

During muscle contraction, the I band and H zone __________

According to the sliding-filament model of muscle contraction, the thick and thin filaments do not change ________ when the sarcomere shortens

The region occupied only by the actin is known as the _______ bands

The broad region that corresponds to the length of the thick filaments is known as the ______ band

The mechanism that produces the motion by which actin and myosin slide over one another is called the ________ cycle

The ______ helps anchor the thick myosin filament to the Z-line at the end of the sarcomere.

______ is highly elastic and helps give the muscle the ability to stretch and recoil.

The sarcoplasmic reticulum functions primarily in the storage of ______ ions, which are released upon stimulation by electrical signals.

Calcium triggers a muscle contraction by binding to ______, which causes a conformational change in tropomyosin.

______: Distinguishing among terms like sarcomere, myofibril, myofilament, and myofiber is important.

Myofibrils are made up of three different classes of proteins: Contractile proteins, _______ proteins, and regulatory proteins.

According to the EXAM TIP, don't confuse myofibrils (which are ________) with myofibers (which are entire muscle cells).

The mechanism that produces the motion by which actin and myosin slide over one another is called the ________ cycle.

During muscle contraction, the I band and H zone __________.

The broad region that corresponds to the length of the thick filaments is known as the ______ band.

The ______ is a deep invagination of the sarcolemma into the cell's interior, weaving around and between the myofibrils.

______ are enlarged areas of the sarcoplasmic reticulum that lie adjacent to the T-tubule, storing and releasing calcium in response to an action potential.

A ______ is formed by a T-tubule plus the two adjacent terminal cisternae, typically found at the A-I junction.

The ______ model of muscle contraction explains the process of skeletal muscle contraction.

[Exam tip]: The triads dispersed throughout the entire length of the muscle fiber ensure even distribution of ______ in response to an action potential.

Skeletal muscles are unique in the body because they are long, with multiple ________

Tendons are bands of connective tissue responsible for transmitting the force produced by the muscle to the ________

Muscles consist of many fascicles (bundles) of individual muscle cells, also referred to as muscle fibers or ________

Muscles are organs because they consist of multiple tissue types, including skeletal muscle tissue, connective tissue, blood vessels, and ________

The broad region that corresponds to the length of the thick filaments in a sarcomere is known as the ________ band