MSS- microstructure and function of human muscle systems

Question 1

describe characteristics of skeletal muscle

Answer 1

striated
rapid control - voluntary
subject to fatigue

Question 2

describe characteristics of cardiac muscle

Answer 2

striated
quite rapid
resists fatigue
contracts regularly for 90 years +
involuntary control

Question 3

describe characteristics of smooth muscle

Answer 3

non-striated
slower contraction but very powerful
energy efficient
little fatigue 
usually involuntary control

Question 4

describe what you would see in a light micrograph of skeletal muscle

Answer 4

epimysium - thick , outermost connective tissue
fascicles - little bundles
perimysium- surrounding connective tissue

Question 5

describe what you would see in a light micrograph of fascicles

Answer 5

staining - red/brown - stains proteins inside muscle cells

purple - connective tissues (endomysium) and cell nuclei

Question 6

describe what you would see in a light micrograph of muscle cell fibre

Answer 6

long

multiple nuclei around the edge

Question 7

what is the size of a muscle

Answer 7

1-20 cm

Question 8

what is th3e size of a fascicle

Answer 8

1-5 mm

Question 9

what is the size of a muscle cell / fibre

Answer 9

30-100 um

Question 10

what are the size of myofibrils

Answer 10

1-2 um

Question 11

what are the size of thick and thin filaments

Answer 11

15 nm and 8 nm