Muscle

Question 1

What muscle types have a sliding filaments?

Answer 1

all 3

Question 2

What muscle types have aligned filaments?

Answer 2

striated (cardiac and skeletal)

Question 3

What muscle types have regulation by Ca2+?

Answer 3

all 3

Question 4

What muscle types are multinucleated?

Answer 4

skeletal (cardiac MAY have 2)

Question 5

What muscle types have gap junctions?

Answer 5

all cardiac and some smooth

Question 6

What are the lengths of different muscle types?

Answer 6

• skeletal = 2-3 cm
• cardiac = 50-100 micrometers
• smooth = hundreds of micrometers

Question 7

What are the diameters of different muscle types?

Answer 7

• skeletal = up to 100 microm
• cardiac = 5-15 micrometers
• smooth = 2-5 microm

Question 8

What muscle types have an SR?

Answer 8

all skeletal and cardiac, some smooth

Question 9

What muscle types have a T-system?

Answer 9

striated (card and skel)

Question 10

What muscle types have troponin?

Answer 10

striated (card and skel)

Question 11

What NTs do the different muscle types use?

Answer 11

• skel = ACh
• card = ACh and NE
• smooth = ACh, NE, NO, many peptides

Question 12

What muscle types have motor units?

Answer 12

skel and some smooth

Question 13

What ion are the APs dependent on?

Answer 13

skel = NaCh

• card = NaCh
• smooth = some Ca

Question 14

What muscle types have pacemakers?

Answer 14

card and smooth

Question 15

What are the different muscle types’ rate of tension development?

Answer 15

fast for skel and card and slow for smooth

Question 16

what happens when muscle fibers get bigger?

Answer 16

new myofibrils are formed - the cross-sectional area of each cell is increased