Muscular system study

Question 1

Muscle fiber

Answer 1

Usually has a single motor end plate. Muscle fibers and their associated connective tissues are flexible but can tear if overstretched.

Question 2

Myosin

Answer 2

A protein that, with actin, forms the filaments that contract muscle fibers

Question 3

Actin

Answer 3

A protein that forms filaments of the protein myosin, contracting muscle fibers

Question 4

Sarcomeres

Answer 4

The structural and functional units of a myofibril

Question 5

Sliding Filament Model

Answer 5

Includes all the events involving muscle contraction, and it gets its name from the way sarcomeres shorten. Thick and thin filaments do not change length. Rather, they slide past one another, with the thin filaments sliding toward the center of the sarcomere from both ends.

Question 6

Fast Twitch

Answer 6

fatigable

Question 7

Slow Twitch

Answer 7

fatigue-resistant

Question 8

Peristalsis

Answer 8

Rhythmic waves of muscular contraction in the walls of certain tubular organs.

Question 9

Origin

Answer 9

The end of a muscle that attaches to a relatively immovable part

Question 10

Insertion

Answer 10

The end of a muscle attachment to a movable part

Question 11

Describe the sliding filament model

Answer 11

The sliding filament model is a model of a muscle cell and it includes the following structures: Sarcoplasmic Reticulum, Transverse tubules, and Myofibril (contains thick and thin myofilaments, actin and myosin). It also shows a Z-line disk, a Sarcolemma, a Sarcomere, and a nucleus. A myofibril is divided into sarcomeres. Each sarcomere is an individual contractile unit.