muscular system

Question 0

sarcoplasm

Answer 0

liquid material that surrounds the internal structures of a muscle fiber

Question 1

origin

Answer 1

stationary end of a muscle attached to bone

Question 2

striations

Answer 2

alternating bands of light and dark within a skeletal or cardiac muscle

Question 3

neuromuscular junction

Answer 3

where an axon of a motor nerve and a muscle fiber meet

Question 4

troponin

Answer 4

trio complex of proteins on the thin filament that has an affinity for calcium

Question 5

sarcomeres

Answer 5

functional unit of contraction. ordered arrangement of thin and thin filaments

Question 6

power stroke

Answer 6

performed with the energy of a split ATP molecule. conformational change in the head of myosin molecule.

Question 7

myosin

Answer 7

protein composed of two polypeptides resembling two golf clubs entwined.

Question 8

muscle fiber

Answer 8

skeletal muscle cells

Question 9

insertion

Answer 9

mobile end of a muscle attached to a bone

Question 10

myoglobin

Answer 10

pigment molecule that holds oxygen to provide a ready supply with in a muscle cell

Question 11

sarcolemma

Answer 11

membrane that surrounds muscle fibers

Question 12

thin filaments

Answer 12

one of the two types that make up myofibrils. composed of 3 different proteins

Question 13

myofibril

Answer 13

rodlike structures with in a muscle cell that are bundles of filamentous proteins

Question 14

tropomyosin

Answer 14

filamentous protein of the thin filament that covers the binding sites

Question 15

myosin binding site

Answer 15

location on actin with a strong affinity for neighboring protein

Question 16

transverse tubules

Answer 16

penetrating channels in a muscle fiber that carry the action potential to the interior of the cell

Question 17

thick filaments

Answer 17

one of the two types that make up myofibrils. composed exclusively of the protein myosin

Question 18

sarcoplasmic reticulum

Answer 18

loose network of membrane bound compartments that store calcium

Question 19

actin

Answer 19

primary globular protein of the thin filament