unit 8

Question 1

molecule in muscle that stores energy

Answer 1

creatine phosphate

Question 2

enzyme that breaks down acetylcholine

Answer 2

acetylcolinesterase

Question 3

type of neurotransmitter, which is a chemical secreted into the synaptic clefts at the axon ends of neurons

Answer 3

acetylcholine

Question 4

enzyme that transfers the energy stored in terminal phosphate bonds of ATP molecules so it can be used by a cell

Answer 4

ATPase

Question 5

thick and thin filaments do not change lenghts but they slide past each other

Answer 5

sliding filament model

Question 6

part of the thin filament that in the twisted double strand made up of actin

Answer 6

troponin and tropomyosin

Question 7

a narrow extracellular space between two cells at a synapse

Answer 7

synaptic cleft

Question 8

specialized part of a muslce fiber membrane at a neuromuscular junction

Answer 8

motor end plate

Question 9

synapse between motor neuron and muscle fiber

Answer 9

neuromuscular junction

Question 10

chemical that an axon secretes at a synapse that stimulates or inhibits an effector (muscle or gland) or other neuron

Answer 10

neurotransmitters

Question 11

functional connection between the axon terminal of a neuron and the dendrite or cell body of another neuron or the membrane of another cell type

Answer 11

synapse

Question 12

neuron that conducts impulses from the central nervous system to an effector

Answer 12

motor neurons

Question 13

enlarged portion of sarcoplasmic reticulum near the actin and myosin filaments of a striated muscle fiber

Answer 13

cisterna

Question 14

any of several membranous channels that extend deep into the cell from a muscle fiber membrane

Answer 14

transverse tubules

Question 15

membranous network of channels and tubules within a muscle fiber, corresponding to the endoplasmic reticulum of other cells

Answer 15

sarcoplasmic reticulum

Question 16

structural unit of a myofibril and the functional unit of muscle contraction

Answer 16

sarcomeres

Question 17

contractile fibers in striated muscle cells

Answer 17

myofibrils

Question 18

broad, fibrous sheets of connective tissue that may attach to bone, skin, or to the connective tissue of adjacent muscles

Answer 18

aponeurosis

Question 19

connective tissue surrounding muscle fiber

Answer 19

endomysium

Question 20

bundles of skeletal muscle fibers

Answer 20

fascicle

Question 21

connective tissue surrounding a fascicle

Answer 21

perimysium

Question 22

a layer of connective tissue that closely surrounds each skeletal muscle

Answer 22

epimysium

Question 23

dense connective tissue that seperates an individual skeletal muscle from adjacent muscles and holds it in position

Answer 23

fascia

Question 24

protein in a muscle fiber that forms the thin filaments that slide between thick filaments of the protein myosin, contracting muscle fibers

Answer 24

actin

Question 25

protein in a muscle fiber that forms the thick filaments that pull on the thin filaments of the protein actin, contracting muscle fibers

Answer 25

myosin