Lab 5: Muscle

Question 1

name the 3 types of muscle

Answer 1

skeletal
cardiac
smooth

Question 2

what are all muscles made for

Answer 2

movement

Question 3

what is muscle tissue made of

Answer 3

muscle cells

Question 4

what is needed for movement

Answer 4

ontraction

Question 5

is skeletal muscle movement voluntary or involuntary

Answer 5

skeletal muscles provide voluntary motion

Question 6

describe skeletal muscle cells

Answer 6

multinucleated

Question 7

what are myoblasts

Answer 7

have single nucleus
fuse to form a muscle fiber

Question 8

what is muscle fiber aka

Answer 8

muscle cell

Question 9

describe location of nuclei of muscle cell/fiber of skeletal muscle

Answer 9

nuclei is peripherally located

Question 10

what are muscle cells (fibers) sounded by (skeletal muscle)

Answer 10

CT called endomysium

Question 11

what is sarcomere

Answer 11

smallest functional unit of muscle

Question 12

what is responsible for giving skeletal muscle the striated appearance

Answer 12

sarcomere

Question 13

what is sarcomere composed of

Answer 13

myosin - thick filaments
actin - thin filaments

Question 14

what is perimysium

Answer 14

around a bundle/fascicle

Question 15

what is epimysium

Answer 15

dense ct that surrounds an entire muscle

Question 16

is cardiac muscle striated

Answer 16

yes

Question 17

what is cardiac muscle composed of

Answer 17

myofibrils and sarcomeres for contractility

Question 18

describe cardiac muscle cells

Answer 18

short
branched

Question 19

describe nuclei of cardiac muscle cells

Answer 19

1-2 centrally located nuclei

Question 20

what are cardiac muscle cells connected by

Answer 20

intercalated disks

Question 21

is cardiac muscle contraction voluntary

Answer 21

NOOOO
INVOLUNTARY

Question 22

what do intercalated disks of cardiac muscle have

Answer 22

gap junctions

Question 23

describe gap junctions of intercalated disks of muscle cells

Answer 23

gap junctions allow ions to flow throughout cardiac tissue
muscle contraction is coordinated
heart can work as pump

Question 24

is smooth muscle striated

Answer 24

NOPEEEE

Question 25

is smooth muscle movement involuntary

Answer 25

uhh Yaaaaa

Question 26

describe nuclei of smooth muscle

Answer 26

1 centrally located nucleus

Question 27

T OR F: smooth muscle has intercalated disks

Answer 27

FALSE
NOOO INTERCALATED DISKS IN SMOOTH MUSCLE

Question 28

lets say you cut a section of smooth muscle longitudinally - what are you going to see

Answer 28

the nucleus appears as wide (same width) as the fiber

Question 29

where is smooth muscle found - 5 locations

Answer 29

blood vessel walls
airways
digestive wall
bladder
reproductive system

Question 30

is smooth muscle tissue branched

Answer 30

not really
limited branching

Question 31

what surrounds nucleus in cardiac muscle

Answer 31

glycogen halo

Question 32

describe composition of endomysium

Answer 32

reticular fibers and BM that surround individual muscle fibers

Question 33

describe composition of perimysium

Answer 33

CT around bundles of muscle fibers

Question 34

describe composition of epimysium

Answer 34

dense CT that surrounds an entire muscle

Question 35

what is Z to Z

Answer 35

one sarcomere

Question 36

what is Z

Answer 36

alpha actinin

Question 37

what is A

Answer 37

myosin + actin

Question 38

what is I

Answer 38

actin

Question 39

what is H

Answer 39

myosin

Question 40

what is M

Answer 40

site of creatine kinase

Question 41

what is T

Answer 41

triad
center of T tubule

Question 42

what happens during contraction (to bands of sarcomere)

Answer 42

H and I bands contract
A band remains same length