BSC 2085L Anatomy and Physiology I Laboratory - Quick Definitions

Flashcards covering key definitions and components related to connective tissues and skeletal muscle fibers.

The connective tissue that surrounds an individual muscle fiber is called __.

endomysium

The connective tissue that surrounds an individual fasciculus is known as __.

perimysium

A bundle of muscle fibers collectively wrapped by perimysium is referred to as __.

fasciculus (or fascicle)

The connective tissue that surrounds a large number of fasciculi, thus enveloping a single muscle, is called __.

epimysium

The sheath of connective tissue that encloses and separates individual muscles or groups of related muscles is known as __.

fascia

The plasma membrane of a muscle fiber is termed __.

sarcolemma

Inward invaginations of sarcolemma through which an action potential can travel deep into the muscle fiber are called __.

transverse (T) tubules

The cytoplasm of a muscle fiber is known as __.

sarcoplasm

The structure located very superficially within a multinucleate fiber is the __.

nucleus

Organelles located in between neighboring myofibrils that generate energy are called __.

mitochondria

The modified endoplasmic reticulum that stores and releases calcium ions is known as __.

sarcoplasmic reticulum (SR)

The extended sides of the sarcoplasmic reticulum that travel parallel to transverse tubules are referred to as __.

cisternae (or terminal cisternae)

The unit that serves as a functional contractile unit of muscle tissue and comprises a myofibril end-to-end is known as __.

sarcomere

The thin myofilament in a muscle fiber is called __.

actin

The thick myofilament in a muscle fiber is called __.

myosin

The proteins positioned perpendicular to myofilaments that form the boundary between individual sarcomeres are called __.

Z disc (line)

The alternating light and dark bands that denote overlapping patterns of parallel actin and myosin myofilaments are referred to as __.

striation