100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Previously searched by you
Previously searched by you
logo
BIO 253 MIDTERM QUESTIONS AND ANSWERS 100% CORRECT $18.49
Add to cart
Quickly navigate to
Preview
  2.  
  3. BIO 253
  4.  
  5. BIO 253

Exam (elaborations)

BIO 253 MIDTERM QUESTIONS AND ANSWERS 100% CORRECT
 0 purchase
  • Course
  • BIO 253
  • Institution
  • BIO 253

BIO 253 MIDTERM QUESTIONS AND ANSWERS 100% CORRECTBIO 253 MIDTERM QUESTIONS AND ANSWERS 100% CORRECTBIO 253 MIDTERM QUESTIONS AND ANSWERS 100% CORRECTBIO 253 MIDTERM QUESTIONS AND ANSWERS 100% CORRECT What are the main causes of fatigue addressed for each of the variables tested? - ANSWER-Encourag...

[Show more]

Preview 2 out of 5  pages

Document information

  • January 21, 2025
  • 5
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

Subjects

  • bio 253 midterm questions and answers 100 correct
  • bio 253 midterm questions and answers stuvia
  • what are the main causes of fatigue addressed for

Written for

  • BIO 253
  • BIO 253

Seller

avatar-seller
NursingTutor1

Reviews received

Content preview

BIO 253 MIDTERM QUESTIONS AND
ANSWERS 100% CORRECT
What are the main causes of fatigue addressed for each of the variables tested? -
ANSWER-Encouragement: Change in motivation or central drive
Visual Feedback: Sense of effort
Rest: Build-up of lactic acid and a reduction in blood flow

What would you expect from a person's EMG who has Muscular Dystrophy who is
asked to lift a weight? How would that differ from a person with Myasthenia Gravis? -
ANSWER-Muscular Dystrophy: EMG would look the same as normal individual despite
the muscle cells dying, the nerve signal is unaffected.
Myasthenia Gravis: EMG would look weaker and fatigue faster than a normal individual

The muscle cell doesnt stockpile large quantities of ATP. How does the muscle ensure
enough ATP for intense exercise? - ANSWER-At rest, some ATP transfers a phosphate
to creatine and creates phosphocreatine. This can be used to resynthesizes ATP during
intense exercise for the contraction to continue.

During repeated skeletal muscle contraction, what happens to calcium within a single
motor unit that may lead to fatigue? What is it's overall effect? - ANSWER-A reduction in
calcium ion release due to depletion of Ca2+ ions from intracellular stores: The SR
inhibits excitation-contraction coupling.

If EMG electrodes were placed on the flexor digitorum superficialis (one of the muscles
involved in maintaining grip) while applying sustained max force, what would the EMG
trace look like as you encounter fatigue for both the raw data and the RMS data? -
ANSWER-Raw data would be spikey, and then get smaller.
RMS data would be a nice curve that starts as a plateau and then slopes down

Why is high intensity anaerobic exercise limited in duration? - ANSWER-Lactic acid
breaks down and contributes to fatigue by interfering with contractile processes and by
changing the pH of the muscle cell. The tolerance for decreasing pH in muscle cells is
limited. As pH decreases, enzymes denature and anaerobic respiration becomes
inefficient.

What could be some sources of error (that do not include improper use of the
equipment or not following procedure correctly) in this whole lab that could have
affected your data? (LAB one) - ANSWER-Interference due to movement or sounds
Placement error (human error)

, Define isometric contraction and describe an example - ANSWER-An isometric
contraction is a muscle contraction that sees the muscle remain at the same length in
which there is no movement of the joint.
Holding a wallsit is an example

When the current reached the following stages, what proportion of fibers in the muscle
were contracting?
- At threshold
- At max
- Above the maz - ANSWER-- At threshold only a few of the fibers are being recruited.
- 100% of the fibers are being recruited and contracting
- still 100% because all of the fibers are being used


How did the blood pressure in the leg while standing compare with that of laying down?
Explain your observations. From these findings, what is the correct posture to measure
blood pressure in an artery in the lower limb? - ANSWER-With the volunteer standing,
blood pressure is greater in the leg than blood pressure in the arm. This results from the
hydrostatic pressure on the column of blood. When the volunteer is lying down, the arm
and leg blood pressures should be similar since both are at heart level. Therefore, lower
limb blood pressures must always be measured with the volunteer lying flat; otherwise
the blood pressures will need to be corrected for the hydrostatic pressure.

Some sports people take erythropoietin to increase the number of O2- carrying red
blood cells in blood. What effect is this going to have on blood? As the body works to
maintain an equal flow rate, what happens to blood pressure? - ANSWER-
Erythropoietin increases the viscosity of blood, which increases the resistance of blood
flow. If flow rate is to stay the same, there is going to have to be a proportional increase
in blood pressure generated by the ventricles.

Why do we need to keep in mind the auscultation gap when using the auscultation
method to determine blood pressure? How could it affect measurements if it is not taken
into account? - ANSWER-When inflating the cuff, if you stop inflating at the auscultation
gap you will get a low systolic measurement. If you are deflating the cuff, if you take a
reading at the auscultation gap you will get a higher measurement for diastolic.

A short period of rapid electrical stimuli is used to observe muscle fibers contracting
continuously (tetanus). Chemical agents can cause tetanus by interfering with the motor
neurons. These agents include a toxin produced by the soil bacterium Clostridium tetani
which produces a toxin that blocks inhibitory signals to motor neurons. One of the
symptoms of these agents is called "spastic paralysis". Explain how the nervous system
effects of clostridium tetani toxin would result in tetanus in a muscle. How might this
lead to a life threatening condition? - ANSWER-If the muscles required for breathing
were involved death could follow

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

Guaranteed quality through customer reviews

Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.

Quick and easy check-out

Quick and easy check-out

You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.

Focus on what matters

Focus on what matters

Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!

Frequently asked questions

What do I get when I buy this document?

You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.

Satisfaction guarantee: how does it work?

Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.

Who am I buying these notes from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller NursingTutor1. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for $18.49. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

69484 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 15 years now

Start selling

Recently viewed by you

Package deal ·

(0)

Alle modules voor PLP2 /PLP3 Hanze Verpleegkunde

Exam (elaborations) ·

(0)

ECS1500-24-Y Assessment 6. PASS WITH DISTINCTION.

Exam (elaborations) ·

(0)

QMB 3200 Exam 1 Questions and Answers 100% Correct
$18.49
  • (0)
Add to cart
Added