Muscels

Question 1

Somatic motor neurons consist of cell bodies located in :
their axons are :

Answer 1

CNS
Large myelinated

Question 2

Synapse between axon terminal of somatic neuron & muscle fiber is

Answer 2

Neuromuscular junction

Question 3

Action potential reaching axon terminal of motor neuron leads to opening of

Answer 3

Voltage-gated Ca++ channels

Question 4

Voltage-gated Ca++ channels causing exocytosis of which neurotransmitter : binds to :

Answer 4

acetylcholine
cholinergic nicotinic receptors

Question 5

Binding of acetylcholine to its receptors leads to

Answer 5

Na+ entry

Question 6

After receptors stimulation, acetylcholine is hydrolyzed by

Answer 6

acetylcholinesterase enzyme

Question 7

Skeletal muscle is made up of a group of

Answer 7

Muscle cells (muscle fibers)

Question 8

Muscle fiber is covered by a membrane called :

Answer 8

Sarcolemma

Question 9

Thick filaments :

Answer 9

Myosin

Question 10

Thin filaments made up of :

Answer 10

Actin, Tropomyosin, Troponin.

Question 11

Myosin consists of :

Answer 11

Two heads

Question 12

Two heads of myosin attached to :

Answer 12

Double helix tail

Question 13

Actin is arranged in the form of :
they have :

Answer 13

Double helix
Active sites

Question 14

Tropomyosin arranged in form of strands that :

Answer 14

Cover active sites

Question 15

Troponin is globular protein bound to

Answer 15

Tropomyosin

Question 16

Sarcomere is the area that extend between :

Answer 16

Two adjacent Z discs

Question 17

T tubules are invaginations in the sarcolemma that provide :

Answer 17

Path for rapid transmission of the action potential.

Question 18

Sarcoplasmic reticulum are the site of

Answer 18

Ca++ storage

Question 19

Excitation contraction coupling
Generation of :

Answer 19

Action potential

Question 20

Excitation contraction coupling
Inward spread of depolarization along the :

Answer 20

T tubules

Question 21

Excitation contraction coupling
Release of Ca++ from :

Answer 21

Sarcoplasmic reticulum

Question 22

Excitation contraction coupling
Binding of Ca++ to :
causes tropomysin to :
allowing binding of :

Answer 22

Troponin ,
Move away from active site ,
Myosin head to actin active sites forming Cross bridges.

Question 23

Excitation contraction coupling
Bending of myosin head causes sliding of actin over myosin, leading to :

Answer 23

Muscle shortening

Question 24

Excitation contraction coupling
Energy generated from :

Answer 24

ATP

Question 25

After action potential ends, Ca++ removed by :

Answer 25

Ca++ pump

Question 26

Ca++ pump needs energy which is generated from :

Answer 26

ATP

Question 27

When the intercellular Ca++ concentration decreases, troponin returns to its original state &

Answer 27

Tropomyosin moves back to cover active sites.

Question 28

Muscle fatigue leads to Consumption of : Depletion of : Decrease of : Accumulation of :

Answer 28

Acetyl chorine , ATP , Oxygen & Nutrients , Lactic acid.

Question 29

Name the oxygen-binding pigment that store oxygen in muscle & gives the muscle its red color :

Answer 29

Myoglobin

Question 30

Name the storage of glucose in muscle :

Answer 30

Glycogen

Question 31

Isometric contraction creates force :

Answer 31

Without muscle shortening

Question 32

Isotonic contraction creates force :

Answer 32

With muscle shortening