Old Exam I

Question 1

Dendrotoxin

Answer 1

Blocks VR K channels

Question 2

Dystrophin

Answer 2

DMD - muscular dystrophy

Question 3

Phospolipase A2 aactivation

Answer 3

Ultimately leads to leukotriene production

Question 4

DHP receptors are

Answer 4

Present in the sarcolemma

Question 5

When relaxed, a sarcomere’s band

Answer 5

Gets wider

Question 6

Neostigmine

Answer 6

Inhibits ACHase, Counteracts effects of curare (and anesthesia!)

Question 7

Hyperpolarization is due to

Answer 7

Efflux of K

Question 8

APs involve ____ channels, GPs involve ____ channels

Answer 8

Voltage gated, chemical gated

Question 9

T/F, skeletal muscles have gap junctions?

Answer 9

False! This is smooth muscle.

Question 10

Neural temporal summation is when

Answer 10

neuron releases lots of neural transmitters at a time (frequency increases!)

Question 11

IP3 does what?

Answer 11

Causes Ca to be released from ER

Question 12

Threshold potential is determined by

Answer 12

The voltage that VR Na channels open

Question 13

Absolute refractory period is when what are inactivated?

Answer 13

VR Na channels

Question 14

A sub threshold stimulus delivered to a neuron

Answer 14

Results in a graded potential, causes chemically regulated channels to open, but not voltage regulated

Question 15

Muscle fibers are a collection of

Answer 15

myofibrils

Question 16

Myofibrils are a collection of

Answer 16

Actin and myosin

Question 17

Muscle fascicles are a collection of

Answer 17

Muscle cells

Question 18

Oxygen debt refers to

Answer 18

Reclaiming ATP from excess lactic acid

Question 19

Oxygen debt refers to

Answer 19

Reclaiming ATP from excess lactic acid

Question 20

Smooth muscle cells contract by

Answer 20

Having Ca - calmodulin complex activated by MYOSIN KINASE cascade

Question 21

Myoglobin

Answer 21

Allows muscle fibers to remain aerobic even when blood cannot bring O2

Question 22

Latency in a twitch is due to the time it takes

Answer 22

An AP to be generated and travel along sarcolemma, VR Ca channels located in T-tubule to open

Question 23

(Graph in which stimulus increases with frequency)

Answer 23

Recruitment

Question 24

Curare

Answer 24

CR Channel blocker

Question 25

Flexeril

Answer 25

CNS

Question 26

Tetrodotoxin

Answer 26

VR Na channel blocker