lect 16 signaling pathway and muscles pt 1

Question 1

Which neuron would have TRP channels on it that would
be activated in response to the hot stove?
a. Sensory neuron
b. Interneuron
c. Motor neuron

Answer 1

a. Sensory neuron

Question 2

what is the first step to muscle contraction

Answer 2

motor neuron releases ACH at nueromuscular junction

Question 3

2nd step of muscle contraction?

Answer 3

ach binds to its receptors*(ligan gated ion channel) on the muscle cell
they under go a change that open the channel and allow na+ to enter and initial action potential

Question 4

what does action potential do to muscle contraction?

Answer 4

it occurs due to influx of na and spreads across cell membrane down in T-tubule

Question 5

third step in muscle contraction.

Answer 5

action potential goes own t-tubule and reached voltage gates DHP receptors and it changes

Question 6

fourth step of muscle contraction

Answer 6

DHP receptor pulls the molecular rope that is attached to ryanodine receptor on sarcoplasmic reticulum releases CALCIUM

Question 7

what also occurs during muscle contraction?

Answer 7

1)ATP binds to myosin and releasing actin
2) Myosin hydrolyzes ATP and that energy rotates the myosin head to the cocked position making myosin binds weakly to actin

Question 8

5th step to muscle contraction

Answer 8

calcium binds to troponin and moves the tropomyosin away from the binding site on actin so myosin can bind

Question 9

6 step of muscle contraction

Answer 9

myosin head execute power stroke

Question 10

what core concept is muscle contraction an example of

Answer 10

transformation of energy and matter

Question 11

7 step of muscle contraction

Answer 11

actin filaments slide towards center of sarcomere

Question 12

Which of the following steps of muscle
contraction/relaxation do NOT require ATP?
a. Restoring the Na+ electrochemical gradient
b. Pumping Ca2+ back into the sarcoplasmic
reticulum
c. Power stroke of myosin
d. Rotation of myosin head to attach to actin

Answer 12

c. Power stroke of myosin

Question 13

Which of the following is a reason why dead
people are stiff?
a. Don’t have ATP to shuttle Na+ up its
electrochemical gradient
b. Don’t have ATP to shuttle Ca2+ up its
electrochemical gradient
c. Stay contracted because don’t have ATP for the
myosin to detach from actin
d. Don’t have ATP to lengthen actin

Answer 13

c. Stay contracted because don’t have ATP for the
myosin to detach from actin