Muscle Physiology 1 - Organization of Skeletal Muscle

Front

What is the sarcolemma?

Back

The sarcolemma is the plasma membrane of a skeletal muscle cell, which surrounds the muscle fiber and plays a crucial role in muscle contraction.

Front

What is the epimysium?

Back

The epimysium is the connective tissue that covers the entire muscle organ, providing structure and support.

Front

What are sarcomeres?

Back

Sarcomeres are the contractile units of muscle fibers, repeated along the myofibrils, responsible for muscle contraction.

Front

What proteins primarily make up myofibrils?

Back

Myofibrils are primarily made up of two types of proteins: Actin and Myosin.

Front

What is the function of T-Tubules?

Back

T-Tubules (transverse tubules) are extensions of the sarcolemma that penetrate into the muscle cell, facilitating the transmission of electrical signals.

Front

What is the role of terminal cisternae?

Back

Terminal cisternae are enlarged areas of the sarcoplasmic reticulum that store calcium ions, which are essential for muscle contraction.

Front

What is the perimysium?

Back

The perimysium is the connective tissue that surrounds individual fascicles (bundles of muscle fibers) within a muscle.

Front

What is the function of myofibrils?

Back

Myofibrils are responsible for muscle contraction and are composed of repeating units called sarcomeres.

Front

What is the difference between endomysium and epimysium?

Back

Endomysium is the connective tissue that surrounds individual muscle fibers, while epimysium surrounds the entire muscle organ.

Front

What is the significance of actin and myosin in muscle contraction?

Back

Actin and myosin are the primary proteins involved in muscle contraction; they interact to produce the sliding filament mechanism.