muscle fiber- microscopic structure

Question 1

muscle fiber consists of

Answer 1

single, elongated cell surrounded by plasma membrane called sarcolemma

Question 2

sarcolemma

Answer 2

each fiber contains multiple nuclei which are found beneath sarcolemma

Question 3

myofibrils

Answer 3

threadlike structures that extend the length of muscle cell and fill cell interior and is composed to 2 protein myofilaments

Question 4

myofilaments

Answer 4

actin and myosin

Question 5

actin

Answer 5

thin myofilament

Question 6

myosin

Answer 6

thick myofilament

Question 7

actin and myosin are organized

Answer 7

in an orderly contractile until called sarcomere

Question 8

sliding of filaments shortens

Answer 8

sarcomere

Question 9

millions of sarcomere

Answer 9

shorten within muscle to cause contractions

Question 10

shape of muscle cells

Answer 10

cylindrical

Question 11

there are thousands of

Answer 11

muscles cells in 1 muscle

Question 12

each muscle fiber

Answer 12

has it s own motor nerve ending at the neuromuscular junction

Question 13

neuromuscular junction

Answer 13

where motor neuron terminates on muscle fiber

Question 14

axon terminal

Answer 14

is enlarged tip of motor neuron; it contains sacs of neurotransmitter acetylcholine

Question 15

the membrane of muscle fiber is the

Answer 15

sarcolemma which contains receptor sites for ACH and an inactivator called cholinesterase

Question 16

the synapse

Answer 16

the small space between axon terminal and sarcolemma

Question 17

within muscle fibers are thousands of individual contracting units called sarcomeres which

Answer 17

are arranged end to end in cylinders called myofibrils