Sarcomeres Quiz

Question 1

Muscle Function

Answer 1

Movement of bones or fluids (e.g., blood)
Maintaining posture and body position
Stabilizing joints
Heat generation (especially skeletal muscle)

Question 2

3 types of connective tissue wrap around different parts of the muscle to support it:

Answer 2

Epimysium: wraps around the entire outside of the muscle
Perimysium: surrounds each fascicle
Endomysium: surrounds each muscle fiber

Question 3

Muscle

Answer 3

Consists of hundreds to thousands of muscle cells plus connective tissue wrappings, blood vessels, and nerve fibers

Question 4

Fascicle

Answer 4

A fascicle is a discrete bundle of muscle cells, segregated from the rest of the muscle by a connective tissue sheath.

Question 5

Muscle Fiber

Answer 5

A muscle fiber is an elongated multinucleated cell; it has a banded(striated) appearance.

Question 6

Sarcomeres

Answer 6

The contractile unit of the muscle

Question 7

Myofibril

Answer 7

Chain of sarcomeres

Question 8

What is each sarcomere separated by

Answer 8

Z Disc

Question 9

The contractile protein thick filaments contain

Answer 9

Myosin

Question 10

The contractile protein thin filaments contain

Answer 10

Actin

Question 11

T Tubules

Answer 11

Continuous with the sarcolemma

Penetrate the cell’s interior at each A band–I band junction

Associate with the paired terminal cisternae to form triads that encircle each sarcomere

Question 12

Triad relationships

Answer 12

T tubules conduct impulses deep into muscle fiber

Integral proteins protrude into the intermembrane space from T tubule and SR cisternae membranes

T tubule proteins: voltage sensors…SR foot proteins: gated channels that regulate Ca2+ release from the SR cisternae