Exam 8 DEC

Question 1 of 15

1

Which is a correct statement about ATP in skeletal muscle?

Select one of the following:

  • its binding to actin during crossbridge cycling prevents rigor mortis.

  • it is required to decrease the calcium level within the SR

  • the speed at which it is broken down within cross bridge cycling is the same in all myofibers

  • there are four sources for its production

Explanation

Question 2 of 15

1

the muscle types of ____ and ____ are able to impact the volume of an organ and the muscle type of ___ is under conscious control.

Select one of the following:

  • cardiac - smooth - skeletal

  • cardiac - skeletal - smooth

  • skeletal - smooth - cardiac

  • smooth - skeletal - cardiac

Explanation

Question 3 of 15

1

which of these acts causes the tension increase in cross bridge cycling?

Select one of the following:

  • the release of ATP from the cross bridge

  • the binding of ATP to the cross bridge

  • the release of Pi from the cross bridge

  • the release of the actin from the cross bridge

Explanation

Question 4 of 15

1

At one dorm, the favorite pastime is for one student to jump in a large garbage can while another student uses the rope tied to the can to pull the can and the first student around the courtyard. Unfortunately, when it is your turn, the student in the bucket is a 310-lb offensive lineman for the football team. Needless to say, try as you might, the can never moves. But all is not lost, because from your post of view, you correctly describe what occurs with your skeletal muscle as

Select one of the following:

  • tension was not generated so your muscles did not shorten

  • Eccentric contractions were not occurring because the load was independent

  • the latent period prior to isotonic contraction was not present

  • sarcomeres were not being shortened during the attempt

Explanation

Question 5 of 15

1

the H zone contains the ___ and then ___ contains the Z-line/disk.

Select one of the following:

  • M-line - A band

  • Z-line - Aband

  • M-line - I band

  • Z-line - I band

Explanation

Question 6 of 15

1

We are a Coca-Cola Campus. You decide to switch from drinking Coke to sugar-free Diet Coke. You are not surprised when the Diet Coke tastes similar to Coke. You correctly realize that the Diet Coke ___ contain compounds that can bind to the sweet receptors on your tongue and act as ___.

Select one of the following:

  • Does not - antagonists

  • Does - antagonists

  • Does not - agonists

  • Does - agonist

Explanation

Question 7 of 15

1

In the Party Room, a group of students decide to learn this exam's material by physically acting everything out. After a couple of hours hard at work, they have a question for the Phys Phab. When Melanie walks over to the group, she quickly realizes that several of them are now badly in need of showers. The correct order for processing this information is ___ first and ___ last.

Select one of the following:

  • primary olfactory - olfactory bulb

  • primary olfactory - orbitofrontal cortex

  • olfactory bulb - primary olfactory cortex

  • olfactory bulb - orbitofrontal cortex

Explanation

Question 8 of 15

1

Mrs. Flarplord Baggins has re-designed Crabix to paralyze humans. Scientists determine that this Crabix does not impact any calcium channels and that the myofibers still depolarize. Consequently, Crabix might be preventing skeletal muscle contraction by

Select one of the following:

  • preventing the tropomyosin from moving relative to the thin myofilament

  • binding to the sodium channels on the myofber with a higher affinity than the acetylcholine

  • blocking the calcium channels in the transverse tubules

  • hyperpolarizing the motor neuron and thereby preventing the movement of calcium ions

Explanation

Question 9 of 15

1

When the cytosolic calcium level of a myofiber is increasing, the length of the A band will ___ and the length of the _____ will decrease.

Select one of the following:

  • decrease - M zone

  • remain the same - M zone

  • decrease - H zone

  • remain the same - H zone

Explanation

Question 10 of 15

1

Which of the following actions must occur for a myofiber to relax?

Select one of the following:

  • calcium must be pumped back into the interstitial fluid

  • ADP must be present to detach the myosin from the actin

  • the interstitial acetylcholine at the junction must be eliminated

  • all three statements are correct about relaxing a myofiber

Explanation

Question 11 of 15

1

Isaacs Syndrome (aka neuromyotonia) causes continuous myofiber stimulation due to motor neurons repeatedly having action potentials generated on their axons. Based on this information and our correct knowledge of properly functioning, skeletal muscles, we can correctly determine that patients with this syndrome will have _____ within their myofibers when compared to normal individuals

Select one of the following:

  • a consistently higher level of sodium

  • the same amount of calcium

  • Both statements are correct

  • neither statement is correct

Explanation

Question 12 of 15

1

which pair are both taste receptors that detect compounds that are directly involved in ATP production within the mitochondria?

Select one of the following:

  • sweet and umami

  • fat and sour

  • fat and umami

  • all three pairs are correct

Explanation

Question 13 of 15

1

which is a correct statement about the comparison between lifting a light and a heavy weight?

Select one of the following:

  • the heavy weight will require the activation of fewer motor units

  • the velocity will be slower when lifting the heavy weight

  • the response will be greater with the heavy weight

  • all three statements are correct

Explanation

Question 14 of 15

1

an unfortunate accident causes a patient to have no fluid present within his vestibular system. Consequently, you correctly realize that this patient will

Select one of the following:

  • be able to correct determine if he is falling towards his right but not his left side

  • have images appear normal within his vision when he walks

  • both statements are correct

  • neither statement is correct

Explanation

Question 15 of 15

1

Which is a correct statement about calcium in skeletal muscles?

Select one of the following:

  • the structure in which it is stored surrounds the myofibrils

  • there are two locations of voltage-gated calcium channels in the muscle fibers

  • both statements are correct

  • neither statement is correct

Explanation

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