Muscle revision

Question 1

skeletal muscle fibre

Answer 1

single cell - long and thin

surrounded by surface membrane - sarcolemma

Question 2

filament

Answer 2

assembly of proteins with a long rod like shape

Question 3

can sarcomeres actively lengthen

Answer 3

no
cross bridges can only create a force generated to the centre of the sarcomere
therefore antagonistic pairs are needed

Question 4

desmin

Answer 4

protein associated with the Z line in skeletal muscle

Question 5

relationship of myosin cross bridges with other cross bridges

Answer 5

act independently

Question 6

what is C protein

Answer 6

the thick filament

Question 7

why does increased stimulation cause an increase in force

Answer 7

increased stimulation =increased Ca2+ release = Ca2+ binding = increased cross bridge attachments = increased force

Question 8

intercalated disks in cardiac muscle

Answer 8

form mechanical links between individual cells

Question 9

gap junctions

Answer 9

structures that allow AP to follow cardiac muscle cells

Question 10

protein in the Z line

Answer 10

alpha actinin

Question 11

phosphatase from in relaxation of sm

Answer 11

group of enzymes - catalyst for hydrolysis of organic phosphates
remove phosphate group form their substrate