Muscle Cell and Muscle Fiber Anatomy

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What is the term used to describe the large mass of muscle that powers movement?

Sarcoplasm

Sarcomere

Myofibril

Muscle Belly (correct)

Which protein covers actin binding sites at rest in muscle fibers?

Troponin T

Myosin

Actin

Tropomyosin (correct)

What is the sarcolemma in a muscle fiber?

Membrane of the muscle fiber (correct)

Contractile unit

Energy stores and signaling mechanisms

Inner material surrounding fibers

Which component is considered the smallest complete contractile system in muscle cells?

Sarcomere Signup and view all the answers

Which protein filament is considered 'relaxing' and covers actin binding sites in muscle fibers?

Tropomyosin Signup and view all the answers

Which type of bands do the myofilaments overlap to form in a muscle fiber?

Dark and thick bands (A band) Signup and view all the answers

What is the primary cause of muscle cramps during exercise?

Lactic acid accumulation Signup and view all the answers

Which part of the muscle is considered the immovable end?

Origin Signup and view all the answers

What is the cause of rigor mortis after death?

Partial contraction of skeletal muscles Signup and view all the answers

In the condition of tetanus, what happens to the neurotransmitter acetylcholine?

It is not broken down by cholinesterase, leading to sustained muscle contraction Signup and view all the answers

Which type of muscle primarily relies on extracellular calcium for contraction?

Smooth muscle Signup and view all the answers

What is the main difference in the mechanism of contraction between skeletal and smooth muscles?

The role of calcium in initiating contraction Signup and view all the answers

What is the role of voltage-gated Ca2+ channels in the neuromuscular junction?

Activating vesicles containing Ach to release Ach Signup and view all the answers

What happens when Na+ channels open in response to Ach binding with NM Receptors at the Muscle End Plate?

Production of EPP leading to depolarization of the sarcolemma Signup and view all the answers

What is the function of Ryanodine Receptors in the process of muscle contraction?

Releasing Ca2+ from the sarcoplasmic reticulum to the ICF Signup and view all the answers

What is the immediate result of Trop C binding with Ca2+ during muscle contraction?

Displacement of Tropomyosin exposing myosin binding sites Signup and view all the answers

What occurs once myosin binds to the Second Binding Site in actin during muscle contraction?

Unbinding with the First Binding Site in actin Signup and view all the answers

What is the role of ATP binding to myosin head during muscle contraction?

"Recocking" of the myosin heads Signup and view all the answers

What is the function of creatine phosphate in muscle cells?

To increase regeneration of ATP Signup and view all the answers

Which molecule is responsible for the sustained contraction of individual fibers even when the muscle is at rest?

Tropomyosin Signup and view all the answers

What is the main source of energy for muscle contractions?

ATP from cellular respiration Signup and view all the answers

Which term refers to the minimal strength required to cause a muscle contraction?

Threshold Stimulus Signup and view all the answers

What happens to muscles during hypertrophy?

Muscles enlarge due to working out or certain disorders Signup and view all the answers

In muscle fibers, what does the all-or-none response principle imply?

Fibers either contract fully or not at all Signup and view all the answers

What is responsible for the brief period of repolarization in Phase 1 of the action potential?

K+ influx Signup and view all the answers

Muscle Cell and Muscle Fiber Anatomy

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Questions and Answers

What is the term used to describe the large mass of muscle that powers movement?

Which protein covers actin binding sites at rest in muscle fibers?

What is the sarcolemma in a muscle fiber?

Which component is considered the smallest complete contractile system in muscle cells?

Which protein filament is considered 'relaxing' and covers actin binding sites in muscle fibers?

Which type of bands do the myofilaments overlap to form in a muscle fiber?

What is the primary cause of muscle cramps during exercise?

Which part of the muscle is considered the immovable end?

What is the cause of rigor mortis after death?

In the condition of tetanus, what happens to the neurotransmitter acetylcholine?

Which type of muscle primarily relies on extracellular calcium for contraction?

What is the main difference in the mechanism of contraction between skeletal and smooth muscles?

What is the role of voltage-gated Ca2+ channels in the neuromuscular junction?

What happens when Na+ channels open in response to Ach binding with NM Receptors at the Muscle End Plate?

What is the function of Ryanodine Receptors in the process of muscle contraction?

What is the immediate result of Trop C binding with Ca2+ during muscle contraction?

What occurs once myosin binds to the Second Binding Site in actin during muscle contraction?

What is the role of ATP binding to myosin head during muscle contraction?

What is the function of creatine phosphate in muscle cells?

Which molecule is responsible for the sustained contraction of individual fibers even when the muscle is at rest?

What is the main source of energy for muscle contractions?

Which term refers to the minimal strength required to cause a muscle contraction?

What happens to muscles during hypertrophy?

In muscle fibers, what does the all-or-none response principle imply?

What is responsible for the brief period of repolarization in Phase 1 of the action potential?

Which phase is characterized by a plateau of action potential due to Ca2+ influx?

What inhibits muscle contraction in smooth muscles?

What is responsible for the slowly depolarizing prepotential in the SA Node?

Which component of smooth muscles phosphorylates and activates myosin heads?

What is the main function of Caveoli in smooth muscles?

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