chapter 9 part 1

Question 1

smooth muscle

Answer 1

-involuntary
-pushes fluid through the digestive tract and the urinary tract (from kidney to bladder)

Question 2

properties of muscle tissue

Answer 2

-excitablility
-contractibility
-extensibility
-elasticity

Question 3

excitability

Answer 3

response to stimuli

Question 4

extensibility

Answer 4

contract with resting

Question 5

skeletal muscle

Answer 5

-voluntary
-causes movement by pulling tendons
-posture
-support
-regulation (pee and vomit)
-BODY TEMP

Question 6

microscopic muscle anatomy

Answer 6

microfibrils, myofilaments, sacromeres

Question 7

epimysium

Answer 7

tissue around entire muscle
-it is a connective tissue

Question 8

perimysium

Answer 8

tissue dividing muscle into fascicles (fiber bundles)

Question 9

fascicle

Answer 9

fiber bundle

Question 10

endomyseum

Answer 10

tissue surrounding individual fiber
-has blood vessels that make coiled networks that are used for flexion and extension

Question 11

tendons

Answer 11

connect muscle and bone

Question 12

aponeuroses

Answer 12

connect muscle to muscle

Question 13

motor end plate

Answer 13

neuromuscular junction
-where the nerve and muscle meet

Question 14

sarcolemma

Answer 14

plasma membrane of muscle fiber (has nucleus!!!)

Question 15

sarcoplasm

Answer 15

cytosol of muscle cell (where the myofibrils are!!!!!!)

Question 16

myoblasts

Answer 16

they fuse and become immature fiber that will later become a myosatellite cell

Question 17

myosatellite

Answer 17

repairs damaged muscle

Question 18

myofibrils cause?

Answer 18

muscle contractions

Question 19

myofibrils are located on?

Answer 19

the ends of muscle on sarcolemma

Question 20

myofibrils are surrounded by?

Answer 20

sarcoplasmic reticulum

Question 21

sarcoplasmic reticulum

Answer 21

-filled w calcium
-part of excitation/ contraction

Question 22

what are myofibrils made of?

Answer 22

myofilaments

Question 23

what are myofilaments made of?

Answer 23

actin (thin) and myosin (thick)

Question 24

myofilaments

Answer 24

runs parallel to long axis of the cell

Question 25

myosin and actin

Answer 25

are arranged in sacromeres

Question 26

sacromere

Answer 26

functioning unit of muscle cell -their A bands overlapping is what causes striations

Question 27

actin

Answer 27

-filaments do not touch -made of g actin molecules -bind with myosin cross bridges -binding sites are covered by tropomyosin when RELAXED -tropomyosin is held in place by troponin

Question 28

troponin

Answer 28

needs to bind with calcium to move and expose tropomyosin/ active site

Question 29

organizational order

Answer 29

fascicle -> fiber -> myofibril -> myofilament -> actin and myosin

Question 30

myosin

Answer 30

-made of elongated tail and globular head -STATIONARY molecule -protein forms M line -core of tinin connects z line both hold it in place as stationary -the head binds to the active site of actin and pulls so the head will bend -need calcium ions and ATP for contraction

Question 31

contraction

Answer 31

-muscles get shorter -H and L bands get smaller -sliding filament theory