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Muscle Physiology Q&A: Fiber Types, Contraction, and Sarcomere Function, Exams of Advanced Education

Princeton UniversityAdvanced Education

A comprehensive set of questions and answers related to muscle physiology, specifically focusing on the structure and function of skeletal muscles. It covers topics such as muscle fiber types, sarcomere components, and the sliding filament theory. The material is presented in a question-and-answer format, making it useful for students reviewing for exams or seeking a deeper understanding of muscle mechanics. It also explores the chemical composition of muscles, the role of various proteins, and the processes involved in muscle contraction and relaxation. A valuable resource for students studying kinesiology, exercise science, or related fields, offering a concise yet thorough overview of key concepts in muscle physiology.

Typology: Exams

2024/2025

Available from 07/10/2025

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EDKP 391 Chapter 18 Test With
Complete Solution
What are cylindrical cells? - Answer Fibers
What does fiber length vary from? - Answer A few mm to 30 cm
What surrounds the entire muscle and blends into intramuscular tissue sheaths to form
tendons? - Answer Epimysium
What surrounds a bundle of fibers called a fasciculus? - Answer Perimysium
What wraps each muscle fiber and separates it from neighboring fibers? - Answer
Endomysium
What surrounds each muscle fiber and encloses fiber's cellular contents? - Answer
Sarcolemma
What contains the nuclei that house genes, mitochondria and other specialized
organelles? - Answer Sarcoplasm
What provides structural integrity to the skeletal muscle? - Answer Sarcoplasmic
reticulum
What connects both ends of the muscle periosteum? - Answer Tendons
Where is the origin of a muscle? - Answer The location where the tendon joins a
relatively stable skeletal part
Where is the insertion of a muscle? - Answer Muscle attachment to moving bone?
Out of origins and insertions, which are generally proximal and which are generally
distal? - Answer Origins and generally proximal and insertions are generally distal
What is muscle's chemical composition? - Answer Water= 75%
Proteins=20%
Salts and other substances=5%
What are myosin, actin and tropomyosin? - Answer The most abundant muscle proteins
Arteries and veins lie parallel to what? - Answer Muscle fibers
Where do the arterioles, capillaries and venules form to network? - Answer In and
around the endomysium
What's different in trained muscles vs untrained muscle with regards to capillaries? -
pf3
pf4
pf5

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Download Muscle Physiology Q&A: Fiber Types, Contraction, and Sarcomere Function and more Exams Advanced Education in PDF only on Docsity!

EDKP 391 Chapter 18 Test With

Complete Solution

What are cylindrical cells? - Answer Fibers What does fiber length vary from? - Answer A few mm to 30 cm What surrounds the entire muscle and blends into intramuscular tissue sheaths to form tendons? - Answer Epimysium What surrounds a bundle of fibers called a fasciculus? - Answer Perimysium What wraps each muscle fiber and separates it from neighboring fibers? - Answer Endomysium What surrounds each muscle fiber and encloses fiber's cellular contents? - Answer Sarcolemma What contains the nuclei that house genes, mitochondria and other specialized organelles? - Answer Sarcoplasm What provides structural integrity to the skeletal muscle? - Answer Sarcoplasmic reticulum What connects both ends of the muscle periosteum? - Answer Tendons Where is the origin of a muscle? - Answer The location where the tendon joins a relatively stable skeletal part Where is the insertion of a muscle? - Answer Muscle attachment to moving bone? Out of origins and insertions, which are generally proximal and which are generally distal? - Answer Origins and generally proximal and insertions are generally distal What is muscle's chemical composition? - Answer Water= 75% Proteins=20% Salts and other substances=5% What are myosin, actin and tropomyosin? - Answer The most abundant muscle proteins Arteries and veins lie parallel to what? - Answer Muscle fibers Where do the arterioles, capillaries and venules form to network? - Answer In and around the endomysium What's different in trained muscles vs untrained muscle with regards to capillaries? -

Answer Trained muscle has increased capillary to muscle fiber ratio What does enhanced capillary microcirculation do? - Answer It expedites the removal of heat and metabolic byproducts and facilitates delivery of O2, nutrients and hormones What's the difference in total number of capillaries per area of muscle in endurance trained athletes? - Answer 40% more What stimulates capillary development? - Answer Vascular stretching and shearing on vessel walls from increased blood flow during exercise What do myofilaments consist of? - Answer Myosin and actin What kind of pattern does a myofibril have? - Answer Cross-striation pattern What represents the lighter area in the sarcomere? - Answer The I band (lIghter) What represents the darker area in the sarcomere? - Answer The A band (dArker) What does the center of the A band contain in the sarcomere? - Answer H zone (Home is in the center) What bisects the H zone in the sarcomere and consists of protein structures that support arrangement of myosin filaments? - Answer M band (Middle is like bisecting) What bisects the I band in the sarcomere and adheres to sarcolemma to provide structural stability? - Answer Z line (IZ like easy) What comprises the functional unit of a muscle fiber repeating itself between the Z lines and contains the contractile proteins actin and myosin? - Answer The sarcomere What determines' the muscle's functional properties? - Answer Sarcomere length What factors in the sarcomere affect a muscle's force and power-generating capacity? - Answer Length and alignment How do pennate muscles differ from fusiform muscles? - Answer 1. Shorter fibers

  1. More individual fibers
  2. Less ROM Where do fusiform fibers run? - Answer Parallel to muscle's long axis so fiber length equals muscle length What do fusiform fibers facilitate? - Answer Rapid muscle shortening Which type of fiber allows the packing of a large number fibers into a small cross-sectional area? - Answer Pennate fibers What is the visual difference for telling if a muscle is fusiform or pennate? - Answer

crossbridge interaction and diminshed active tension development When do myosin crossbridges detach from actin filaments? - Answer When ATP molecules join the actomyosin complex What happens after a myosin crossbridge detaches? - Answer It returns to its original state ready to bind to a new actin site How does myosin ATPase yield energy for muscle action? - Answer By splitting ATP What does the excitation-contraction coupling represent? - Answer The physiologic mechanisms by which muscle action is produced How does excitation-contraction coupling work? - Answer An electrical discharge triggers a chemical event to release intracellular CA2+ What does intracellular CA2+ regulate? - Answer Muscle fiber's contractile and metabolic activity How do crossbriges produce muscle tension? - Answer Crossbridges lead to ATP being split, which generates energy that allows myosin crossbridges to generate muscle tension When does relaxation of the muscle occur? - Answer When myosin and actin return to their original states How is CA2+ involved with muscle recovery? - Answer CA2+ is pumped into sarcoplasmic reticulum What are the two purposes of deactivation? - Answer 1. Prevents mechanical link between myosin crossbridges and actin filaments

  1. Prevent ATP splitting Which step in muscle action is the release of acetylcholine? - Answer Step 1 Which step in muscle action is the depolarization of the tubules? - Answer Step 2 Which step in muscle action is CA2+ released from the sarcoplasmic reticulum? - Answer Step 3 Which step in muscle action is CA2+ binding to troponin-tropomyosin filaments? - Answer Step 4 What is step 5 in the muscle action sequence? - Answer Actin combines with myosin-ATP which activates myosin ATPase which splits ATP Which step in muscle action is ATP binding to the crossbridge and allowing thick and thin filaments to slide past each other so that the muscle can shorten? - Answer Step 6 Which step in muscle action is the crossbridge activating due to elevated levels of CA2+

which inhibit the troponin-tropomyosin system? - Answer Step 7

What is step 8 in the muscle action sequence? - Answer 1. Muscle stimulation ceases

  1. CA2+ returns to sarcoplasmic reticulum

What is step 9 in the muscle action sequence? - Answer CA2+ removal restores inhibitory action of troponin-tropomyosin, which prevents actin combining with myosin and leaving both in a free state

What do fast twitch fibers rely on? - Answer A developed short-term glycolytic system for energy transfer

Which fiber type is this?

  1. High ability for electrochemical actin potential transmission
  2. High myosin ATPase activity
  3. Rapid CA2+ release and uptake by sarcoplasmic reticulum
  4. High rate of crossbridge turnover - Answer Fast-twitch

What are the three types of fast twitch fibers? - Answer 1. Type IIa: Fast Oxidative-Glycolytic fibers (FOG)

  1. Type IIx: Midway between a and b
  2. Type IIb

What is the type IIb fiber known for? - Answer Greatest anaerobic potential and most rapid shortening velocity; "true" fast fiber

How do slow-twitch fibers work? - Answer Generating energy for ATP resynthesis through aerobic system