4/3 lab quiz

Question 1

What type of interaction is responsible for muscle cell contraction?

Answer 1

myofilament

Question 2

What protein are thin filaments primarily composed of?

Answer 2

actin
-F and G

Question 3

What protein are thick filaments primarily made of?

Answer 3

myosin II

Question 4

What is the cytoplasm of muscle cells called?

Answer 4

sarcoplasm

Question 5

what are the three types of striated muscle?

Answer 5

skeletal, visceral striated, and cardiac

Question 6

what are the two names given to skeletal muscle cells?

Answer 6

muscle fiber
multinucleated syncitium

Question 7

A muscle fiber is formed during development by the fusion of small, individual muscle cells called _____________________

Answer 7

myoblasts

Question 8

consists of the plasma membrane of the muscle cell, its external lamina, and the surrounding reticular lamina

Answer 8

sarcolemma

Question 9

the delicate layer of reticular fibers that immediately surrounds individual muscle fibers

Answer 9

endomysium

Question 10

the thicker connective tissue layer that surrounds a group of fibers to form a bundle or fascicle

Answer 10

perimysium

Question 11

functional units of muscle fibers that tend to work together to perform a specific function

Answer 11

fascicles

Question 12

the sheath of dense connective tissue that surrounds collection of fascicles that constitutes the muscle; also called?

Answer 12

epimysium
deep investing fascia

Question 13

functions primarily to store oxygen in muscle fibers and provides a ready source of oxygen for muscle metabolism

Answer 13

myoglobin

Question 14

-small fibers that appear red in fresh specimens and contain many mitochondria and large amounts of myoglobin and cytochrome complexes
-slow-twich
-resistant to fatigue

Answer 14

Type I fibers

Question 15

-intermediate fibers seen in fresh tissue
-contain large amounts of glycogen and are capable of anaerobic glycolysis
-fast-twitch

Answer 15

Type IIa fibers

Question 16

-large fibers that appear light pink in fresh specimens and contain less myoglobin and fewer mitochondria
-fast twitch
-fatigue prone

Answer 16

Type IIb fibers

Question 17

-longitudinally arrayed structural subunit that fill muscle fibers
-extend the entire length of the muscle

Answer 17

myobfibrils

Question 18

The bundles of myofilaments that make up the myofibril are surrounded by a well-developed, smooth-surfaced endoplasmic reticulum, also called the __________________

Answer 18

sarcoplasmic reticulum

Question 19

Which bands are dark?

Answer 19

A bands

Question 20

Which bands are light?

Answer 20

I bands

Question 21

a dense line bisecting the I band

Answer 21

Z line or Z disc

Question 22

less dense region that bisects the A band

Answer 22

H band

Question 23

narrow dense line bisecting the H band

Answer 23

M line

Question 24

small, polar molecule that polymerizes to form a double-stranded helix, the F-actin filament

Answer 24

G-actin

Question 25

densely staining cross-bands that cross the fibers in a way that resembles the risers of a stairway; present in cardiac muscle
-highly specialized attachment sites between adjacent cells

Answer 25

intercalated discs

Question 26

region of cardiac muscle cells where the organelles are concentrated

Answer 26

juxtanuclear region

Question 27

serves as the site at which the thin filaments in the terminal sarcomere anchor onto the plasma membrane
-holds the cardiac muscle cells at their ends to form the functional cardiac muscle fiber

Answer 27

fascia adherens

Question 28

-bind the individual muscle cells to one another
-help prevent the cells from pulling apart under the strain of regular repetitive contractions

Answer 28

maculae adherentes

Question 29

provide ionic continuity between adjacent cardiac muscle cells, allowing informational macromolecules to pass from cell to cell

Answer 29

gap junctions

Question 30

generate and rapidly transmit the contractile impulse to various parts of the myocardium in a precise sequence

Answer 30

purkinje fibers