Skeletal Muscle Anatomy

Question 1

What is a muscle cell called?

Answer 1

Muscle fiber

Question 2

3 connective tissue coverings

Answer 2

Epimysium, perimysium, endomysium

Question 3

Forms connective tissue sheath that surrounds each skeletal muscle

Answer 3

Epimysium

Question 4

Loose connective tissue that serves as passageways for blood vessels and nerves that supply each fascicle. A sheath of connective tissue that surrounds a bundle of muscle fibers.

Answer 4

Perimysium

Question 5

Bundle of muscle fibers is called

Answer 5

Fascicles

Question 6

Delicate layer of connective tissue that separates individual muscle fibers within each fascicles. Serves as passageways for nerve fiber and blood vessels that supply each muscle fiber

Answer 6

Endomysium

Question 7

2 main aspects to muscle contraction

Answer 7

Mechanical and electrical component

Question 8

3 muscle fiber components (electrical)

Answer 8

Sarcolemma, transverse tubules. Sarcoplasmic reticulum

Question 9

Cell membrane of muscle fibers

Answer 9

Sarcolemma (flesh+husk)

Question 10

Tubelike inward folds of sarcolemma. Carries electrical impulses into the center of the muscle fiber so that the
muscle fiber contracts as a whole.

Answer 10

Transverse tubules/ T tubules

Question 11

Specialized endoplasmic reticulum in skeletal muscle fiber that store high lvl of Ca²+

Answer 11

Sarcoplasmic reticulum

Question 12

Enlarged portion of sarcoplasmic reticulum

Answer 12

Terminal cisternae

Question 13

A critical structure for muscle contraction. Formed by 2 terminal cisternae and T tubules.

Answer 13

Triad

Question 14

2 main structures in muscle fiber (mechanical)

Answer 14

Myofibrils, myofilaments

Question 15

Bundles of protein filaments. They are long threadlike structure that extend entire length of muscle fiber.

Answer 15

Myofibrils

Question 16

2 types of myofilaments

Answer 16

Actin myofilament (thin filament), myosin myofilament (thick filament)

Question 17

Smallest portion of muscle that can contract

Answer 17

Sacromeres

Question 18

long, fibrous protein that lies in the groove
along the fibrous actin strand.

Answer 18

Tropomyosin

Question 19

consists of three subunits: (a) a subunit that anchors the
_____ to the actin, (b) a subunit that prevents the tropomyosin from uncovering
the actin attachment sites in a relaxed muscle, and (c) a subunit that binds Ca2+.

Answer 19

Troponin

Question 20

consists of (1) the axon terminals and
(2) the area of the muscle fiber sarcolemma they innervate.

Answer 20

neuromuscular junction, or synapse

Question 21

a molecule that allows
a neuron to communicate with its target.

Answer 21

Neurotransmitter