Muscular Cell Quiz

Play an AI-generated podcast conversation about this lesson

Which term refers to the cytoplasm of muscular cells?

Sarcoplasmic reticulum
Sarcoplasm (correct)
Myofibril
Sarcolemma

Which type of muscle is characterized by being striated and voluntary?

Skeletal (correct)
Cardiac
Smooth
None of the above

Which connective tissue layer surrounds each bundle of muscle fibers?

Epimysium
Perimysium (correct)
Endomysium
None of the above

Which type of muscle fiber is characterized by being slow but repetitive and not easily fatigued?

Type 1 (D) Signup and view all the answers

What is the major site of oxidative phosphorylation in the body?

Muscles of the back (D) Signup and view all the answers

Which type of muscle fiber is characterized by being fast and easily fatigued?

Type 2B (C) Signup and view all the answers

Which type of muscle fiber is characterized by being fast but not easily fatigued?

Type 2A (D) Signup and view all the answers

Which statement best describes the structure of myosin?

It is a large complex with two identical heavy chains and two pairs of light chains (A) Signup and view all the answers

What is the function of the T-tubules in skeletal muscle?

To conduct the impulse from outer to deeper parts of the muscle (B) Signup and view all the answers

What happens during muscle contraction?

The H zone disappears as it contains both actin and myosin (C) Signup and view all the answers

Which term refers to the plasma membrane of muscular cells?

Sarcolemma (C) Signup and view all the answers

What is the function of the Sarcoplasmic reticulum in muscle cells?

To release calcium ions for muscle contraction (C) Signup and view all the answers

Which type of muscle fiber is characterized by being non-striated and involuntary?

Smooth (B) Signup and view all the answers

Which type of muscle fiber is characterized by being slow but repetitive and not easily fatigued?

Type 1 (Red) muscle fibers (B) Signup and view all the answers

What is the major site of oxidative phosphorylation in the body?

Red (slow; type 1) muscle fibers (D) Signup and view all the answers

Which statement best describes the structure of myosin?

It is a protein that forms thick filaments in muscle fibers (C) Signup and view all the answers

What is the function of the T-tubules in skeletal muscle?

They transport action potentials deep into the muscle fiber (C) Signup and view all the answers

Which protein attaches to the free end of actin to regulate its length?

Trobomodulin (C) Signup and view all the answers

Which statement accurately describes the structure of myosin?

Myosin heavy chains are thin, rodlike motor proteins twisted together as myosin tails. (B) Signup and view all the answers

What is the function of the sarcoplasmic reticulum in muscle contraction?

To regulate the calcium concentration within the myofibril. (B) Signup and view all the answers

What are the special names of muscular cells?

<ol> <li>Muscle cell = muscle fiber = myofiber.</li> </ol> Signup and view all the answers

What are the three types of muscle fibers?

<ol> <li>Skeletal (striated and voluntary), 2) Cardiac (striated and involuntary), 3) Smooth (non-striated and involuntary).</li> </ol> Signup and view all the answers

What are myofibrils and what are they composed of?

Myofibrils are the contractile elements of skeletal muscle cells. They are composed of overlapping thick (myosin) and thin (actin) myofilaments. Signup and view all the answers

What is the structure of sarcomere?

Sarcomere is the functional contractile unit of striated muscles. It consists of one dark band (A band) in the middle and two halves of light band (I band) on either side. Signup and view all the answers

What are the components of the thin filament (actin)?

The thin filament (actin) is formed of F-actin, which is a double helical polymer of G-actin protein. It also includes tropomyosin and troponin. Signup and view all the answers

Describe the structure of thick filament (myosin).

The thick filament (myosin) is 15nm in diameter and consists of 300 myosin molecules. Each myosin molecule resembles two golf clubs and has two identical heavy chains and two pairs of light chains. Signup and view all the answers

What are the three types of muscle fibers and their characteristics?

The three types of muscle fibers are: 1) Red (slow; type 1) - slow but repetitive, not easily fatigued, high in oxidative enzymes, and low in ATPase; 2) Intermediate (type 2A) - fast but not easily fatigued, intermediate in oxidative enzymes and ATPase; 3) White (fast; type 2B) - fast and easily fatigued, low in oxidative enzymes, high in ATPase and phosphorylases. Signup and view all the answers

What is myotonia and what causes it?

Myotonia is a neuromuscular condition characterized by slow or delayed relaxation of a muscle after voluntary contraction. It is caused by mutations in the gene that controls voltage-gated chloride ion (Cl-) in the sarcolemma of skeletal muscle fibers. Signup and view all the answers

What is delayed onset muscle soreness (DOMS) and what are its underlying mechanisms?

Delayed onset muscle soreness (DOMS) is the sensation of skeletal muscle soreness, stiffness, and pain that occurs after a single, unaccustomed, intensive exercise event. The underlying mechanisms include loss of muscle fiber integrity (sarcolemmal tearing, myofilament disruption, cytoskeletal disarray, Z-band streaming) accompanied by acute inflammation in the endomysium, which sensitizes surrounding nociceptors (pain receptors). Signup and view all the answers

What is the function of the sarcoplasmic reticulum in muscle contraction?

The sarcoplasmic reticulum is responsible for storing and releasing calcium ions during muscle contraction. When a muscle is stimulated to contract, calcium ions are released from the sarcoplasmic reticulum, which triggers the interactions between actin and myosin filaments, leading to muscle contraction. Signup and view all the answers

Muscular Cell Quiz

Choose a study mode

Podcast

Questions and Answers

Which term refers to the cytoplasm of muscular cells?

Which type of muscle is characterized by being striated and voluntary?

Which connective tissue layer surrounds each bundle of muscle fibers?

Which type of muscle fiber is characterized by being slow but repetitive and not easily fatigued?

What is the major site of oxidative phosphorylation in the body?

Which type of muscle fiber is characterized by being fast and easily fatigued?

Which type of muscle fiber is characterized by being fast but not easily fatigued?

Which statement best describes the structure of myosin?

What is the function of the T-tubules in skeletal muscle?

What happens during muscle contraction?

Which term refers to the plasma membrane of muscular cells?

What is the function of the Sarcoplasmic reticulum in muscle cells?

Which type of muscle fiber is characterized by being non-striated and involuntary?

Which type of muscle fiber is characterized by being slow but repetitive and not easily fatigued?

What is the major site of oxidative phosphorylation in the body?

Which statement best describes the structure of myosin?

What is the function of the T-tubules in skeletal muscle?

Which protein attaches to the free end of actin to regulate its length?

Which statement accurately describes the structure of myosin?

What is the function of the sarcoplasmic reticulum in muscle contraction?

What are the special names of muscular cells?

What are the three types of muscle fibers?

What are myofibrils and what are they composed of?

What is the structure of sarcomere?

What are the components of the thin filament (actin)?

Describe the structure of thick filament (myosin).

What are the three types of muscle fibers and their characteristics?

What is myotonia and what causes it?

What is delayed onset muscle soreness (DOMS) and what are its underlying mechanisms?

What is the function of the sarcoplasmic reticulum in muscle contraction?

More Like This

Muscular System Quiz: Test Your Knowledge with Flashcards

Human Anatomy and Muscular System Quiz

Muscular System: Types of Muscle Tissues

Anaphy