Test 4

Question 1

Cori Cycle

Answer 1

Removal and recycling of lactic acid by liver, liver converts lactate to pyruvate, glucose is released to recharge muscle glycogen reserves

Question 2

Parts of triad

Answer 2

1 T tubule, 2 terminal cisternae

Question 3

Sarcolemma

Answer 3

Membrane surrounding a fascicle

Question 4

Facial muscle not associated with facial expression

Answer 4

Masseter

Question 5

What muscle originates on iliac crest

Answer 5

Quadratus lumborum

Question 6

Muscle that forms floor of mandible

Answer 6

Mylohyoid

Question 7

Muscle building cells

Answer 7

Myoblasts

Question 8

What has the fewest fibers

Answer 8

Muscles moving the eye

Question 9

Bulbsponginosis origin

Answer 9

Penis or clitoris

Question 10

Upper Arm muscle that doesn’t move the shoulder

Answer 10

Brachialis

Question 11

Cross bridge formation is caused by

Answer 11

Myosin

Question 12

This filaments

Answer 12

Made up of protein actin

Question 13

Thick filaments

Answer 13

Made up of protein myosin

Question 14

Tendon

Answer 14

Attaches muscle to bone

Question 15

Aponeurosis

Answer 15

Flat sheath that attaches muscle to muscle

Question 16

Z line of sarcomere

Answer 16

Center of the I band, 2 ends of sarcomere

Question 17

Sarcoplasm

Answer 17

Cytoplasm

Question 18

Large diameter, dense fibers, few mitochondria

Answer 18

Slow twitch muscles

Question 19

Tetanus

Answer 19

Muscle is highly stimulated

Question 20

Endomysium

Answer 20

Surrounds individual muscle cells

Question 21

Perimysium

Answer 21

Surrounds group of fibers/a fascicle

Question 22

Epimysium

Answer 22

Surrounds group of fascicles

Question 23

When an action potential arrives at terminal, what opens

Answer 23

Voltage gated calcium channels

Question 24

Step 1 of NMJ

Answer 24

An actions potential travels the length of the axon of a motor neuron to an axon terminal

Question 25

Step 2 of NMJ

Answer 25

Voltage gated calcium channels open and Ca ions diffuse into the terminal

Question 26

Step 3 of NMJ

Answer 26

Ca entry causes synaptic vesicles to release ACh via expcytosis

Question 27

Step 4 of NMJ

Answer 27

ACh diffuses across the synaptic cleft and binds to ACh receptors which contain ligand-gated action channels

Question 28

Step 5 of NMJ

Answer 28

Ligand-gated channels open

Question 29

Step 6 of NMJ

Answer 29

Na ions enter the muscle fiber and K ions exit the muscle fiber. The greater inward flux of Na ions relative to the outward flux of K ions causes the membrane potential to become less negative

Question 30

Step 7 of NMJ

Answer 30

Once the membrane potential reaches a threshold value, an action potential propagates along the sarcolemma