Exam 7

1.

1 point

Alex, preparing to explore Bronson's hairy ass, invented a gun-type device that interferes with the calcium ATPase pumps in the plasma membrane of the victim's muscle cells. Which is a correct consequence to the human-like victims of this gun-type device?

No impact on sarcomere size

Able to increase sarcomere size

No impact on cross bridge cycling

Able to stop crossbridge cycling

2.

1 point

Not to be outdone by Alex, Professor Farnsworth took a break from making doomsday devices to create his own gun-type device that would remove all the calcium from an individual. If he focused its discharge solely on your calf muscle, we would expect that muscle

Not to contract because there would be no ACh to bind to the myofiber

Not to contract because the crossbridge could not bind to the actin

To contract because there would be ACh to bind to the myofiber

To contract because the crossbridge bound to the actin

3.

1 point

The initial source of ATP of ATP for skeletal muscle is ___ then from ___, if prolonged activity continues

Creatine phosphate - oxidative phosphorylation

Glycolysis - oxidative phosphorylation

Creatine phosphate - glycolysis

Glycolysis - glycolysis

4.

1 point

The I-band and H-zone will ___ during an ___ contraction because the load is ___ than the tension.

Increase - eccentric - greater

Remain the same - isometric - greater

All three of these statements are correct.

Decrease - isotonic - less

5.

1 point

With increased aerobic exercise, we expect to see increased ___. With increased anaerobic exercise, we expect to see increased ___.

Glycolytic enzymes - myofiber diameter

Myofiber diameter - vascularization

Vascularization - mitochondria

Mitochondria - glycolytic enzymes

6.

1 point

At the RPAC, you watch another student unsuccessfully attempt to lift a 200-lb weight. You correctly tell her that

She was doing less fused than unfused tetanus during that lift

She was doing more fused than unfused tetanus during that lift

She experienced a larger response than when lifting the 100-lb weight earlier

She experienced a smaller response than when lifting the 100-lb weight earlier

7.

1 point

A decrease in the frequency and intensity of the stimuli will increase the ___ and lead to ___ tetanus.

Return of calcium - unfused

Latency - unfused

Latency - fused

Return of calcium - fused

8.

1 point

As a break from studying at Thompson library, you decide to try to lift the extremely large and heavy wooden table at which you have been seated. Considering this process physiologically, you correctly realize that

You were mainly going to be doing an isometric contraction

You were primarily going to be activating your fast-glycolytic myofibers

You were mainly going to be doing an isotonic contraction

You were primarily going to be activating your slow-oxidative myofibers

9.

1 point

The defeated Duck fan decided to eliminate his cycle of regrets by crossing the bridge over to thinking about next season and motivating his team for the next year. Because his team needs to improve their muscles, he focused his motivational talk on crossbridge cycling. Which is a correct statement from his speech about crossbridge cycling?

The addition of ATP to the myosin causes it to detach from the actin

The hydrolysis of ATP is not mainly driven by a conformation change

The addition of ATP from the actin causes it to detach from the myosin

The hydrolysis of ATP is mainly driven by a conformation change

10.

1 point

All ___ contractions are preceded by a period of ___ contraction.

Isotonic - eccentric

Isotonic - isometric

Eccentric - isometric

Isometric - isotonic

11.

1 point

After working out, Carmen recalled which correct statement about how her muscles function(s)?

With the myosin site on actin exposed, a cross bridge can only form if ATP is bound to myosin

While cross bridge cycling is occurring, the muscle is generating tension and is always shortening

Tropomyosin resuming its blocking position does not cause calcium to unbind from troponin

While cross bridge cycling is occurring, the muscle is generating tension but not always shortening

Tropomyosin resuming its blocking position causes calcium to unbind from troponin

With the myosin site on actin exposed, a cross bridge can only form if ADP and Pi are bound to myosin

Energy is required for the secondary active transport that removes calcium from the cytosol

Energy is required for the primary active transport that removes calcium from the cytosol

12.

1 point

Buckeye Chuck will spend Spring Break in Africa literally running around with wildebeest (long distance migrating mammals) and springboks (fast sprinters). He correctly expects that, compared to the springbok, the wildebeest will have more ___ components and more typically the ___ working form of the hydrolyzing enzyme in its leg muscles.

Oxidative - slow

Oxidative - fast

Glycolytic - fast

Glycolytic - slow

13.

1 point

While walking around at last weekend's Arnold Fitness EXPO, you overheard numerous erroneous comments about the benefits of using creatine. You correctly tell people that

It will provide power for the entire workout

While on creatine phosphate, your muscles will appear larger due to an increased osmotic gradient

While on creatine phosphate, your muscles will appear larger due to more sarcomeres

It will provide the power at the start of a workout but not at the end

14.

1 point

Before entering his latest patient's room in the ER, Dr. Brutus Buckeye held out his hand for his assistant to give him (add to his hand) the patient's chart. As soon as the chart was placed in his hand, his hand started moving toward the floor. He immediately and correctly remarked to his assistant that he was doing an ___ contraction because he was generating too ___ tension.

Eccentric - much

Isometric - little

Eccentric - little

Isometric - much

15.

1 point

Recently at Hang Over Easy, Jake yelled for the waitress to turn on SportCenter's Top 10. While watching, the TAs made which correct statement about the muscles of various athletes?

Injured athletes will experience muscle atrophy that results from a decrease in sarcomere numbers

Injured athletes will experience muscle hypertrophy that results from an increase in sarcomere numbers

Baseball players (typically run in sprints) will tend to use up their ATP at a quick rate

Baseball players (typically run in sprints) will tend to use up their ATP at a slow rate

16.

1 point

Which of these acts causes the flexing or power stroke of the crossbridge?

The release of the actin from the crossbridge

The binding of ATP to the crossbridge

The release of Pi from the crossbridge

The release of ATP from the crossbridge

17.

1 point

Which of the following is a correct pairing(s) of an ATP source in muscles and a trait of that source?

Glycolysis - possible when anaerobic

Creatine phosphate - converts proteins to ATP

Creatine phosphate - creates 1 ATP per creatine

Glycolysis - only possible in aerobic conditions

Krebs cycle - allows for conversion of proteins

Krebs cycle - creates 1 ATP per glucose

18.

1 point

Womp rats (on Bronson's hairy ass) are about 2 meters long and follow their prey over long distances before romping their now exhausted prey. Since they have similar muscles to Earth animals, which is a correct feature that should exist in womb rat's leg muscles?

A low density of blood vessels

Low activity ATPase for the crossbridge

High activity ATPase for the crossbridge

A high density of blood vessels