muscles and histo features

Question 1

functional unit of muscle

Answer 1

myofiber/myocyte

Question 2

types of myofiber

Answer 2

smooth
striated (skeletal, cardiac)

Question 3

skeletal muscle features

Answer 3

voluntary, striated somatic

Question 4

smooth muscle features

Answer 4

involuntary, nonstriated, visceral

Question 5

multiple muscle fibers are a

Answer 5

fascicle

Question 6

multiple fascicles are

Answer 6

single muscle

Question 7

what holds the fascicles together

Answer 7

collagenous CT

Question 8

what CT surrounds a muscle fiber

Answer 8

endomysium

Question 9

what CT surrounds fascicle

Answer 9

perimysium

Question 10

what CT surrounds whole muscle

Answer 10

epimysium

Question 11

each muscle fiber cell/myocyte is comprised of

Answer 11

myofibril

Question 12

myofibril contains

Answer 12

myofilaments

Question 13

what do myofilaments do

Answer 13

generate contractile force

Question 14

what is a sarcomere

Answer 14

areas along a myofibril where contractile proteins overlap

Question 15

what are the contractile proteins/myofilaments

Answer 15

actin (thin)
myosin (thick)

Question 16

muscles contracting is what:

Answer 16

contraction of sarcomeres

Question 17

I band

Answer 17

light, only actin

Question 18

H band

Answer 18

myosin only

Question 19

A band

Answer 19

dark, actin and myosin

Question 20

bands are

Answer 20

myofilaments , either light areas or dark (overlap)

Question 21

discs or lines are

Answer 21

regions where they are anchored in a myofibril

Question 22

Z line

Answer 22

actin anchor

Question 23

M line

Answer 23

myosin anchor

Question 24

sarcomere is what line to what

Answer 24

Z line to Z line

Question 25

as a sarcomere shortens, what happens to the bands

Answer 25

I band shrinks A band remains constant

Question 26

during contraction, what happens to myofilaments

Answer 26

myofilaments dont shorten, just pull Z lines closer by sliding actin over myosin

Question 27

where does smooth muscle reside

Answer 27

walls of tubular organs, ciliary muscles of eye, glands, hair follicles

Question 28

smooth muscle contraction is specialized for

Answer 28

continuous contraction at low force

Question 29

smooth muscle histologically looks:

Answer 29

elongated, spindle shaped cells with no striations and single central nucleus surrounding network of collagen fusiform shape

Question 30

do smooth muscle fibers have CT wrapping

Answer 30

no

Question 31

what is smooth muscle fiber and fasciculi surrounded by

Answer 31

network of collagenous tissue

Question 32

what is the functional contractile unit of smooth muscles

Answer 32

fascicles

Question 33

what is the functional contractile unit of skeletal muscle

Answer 33

myocyte / muscle fiber

Question 34

how are myofilaments arranged in smooth muscle

Answer 34

criss cross pattern throughout cell and inserts on dense bodies

Question 35

during contraction of smooth muscle, what happens to the cell shape

Answer 35

elongated slender resting state into globular conformation

Question 36

how do smooth muscle cells coordinate contraction with adjacent muscle fibers

Answer 36

gap junction

Question 37

histological appearance of skeletal muscle

Answer 37

large, elongated multinucleated cells multiple peripherally situated nuclei arranged in fascicles cross striations

Question 38

cardiac muscle histological appearance

Answer 38

elongated branching cells joined by intercalated discs usually single central nucleus branching interconnected cells cross striations dur to myofibrils