Cells & Tissues Lect 4: Muscle Tissue Features
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Questions and Answers

What is the primary component of thin filaments in myofibrils?

  • Titan
  • Actin (correct)
  • Myosin
  • Troponin

Which part of the myofibril contains all the thick filaments made of myosin?

  • Z Disc
  • I Band
  • Sarcomere
  • A Band (correct)

What is the primary component of thick filaments in myofibrils?

  • Myosin (correct)
  • Tropomyosin
  • Actin
  • Nebulin

Which compartment of myofilaments is bounded by Z discs?

<p>Sarcomere (D)</p> Signup and view all the answers

What is the function of sarcomeres in a myofibril?

<p>To organize thin and thick filaments (C)</p> Signup and view all the answers

Which region of the myofibril contains only thin filaments primarily composed of actin?

<p>I Band (D)</p> Signup and view all the answers

What is the primary purpose of muscle tissue?

<p>Producing body movements (A)</p> Signup and view all the answers

Which type of muscle tissue is considered voluntary?

<p>Skeletal muscle (A)</p> Signup and view all the answers

Why are skeletal muscle fibres striated?

<p>Due to the highly organized arrangements of myofibrils (A)</p> Signup and view all the answers

Which muscle is responsible for allowing us to look at the bottom of our foot?

<p>Sartorius (A)</p> Signup and view all the answers

What type of muscle tissue is found attached to bones by tendons?

<p>Skeletal muscle (B)</p> Signup and view all the answers

What is the type of contraction generated by muscle tissue when using energy from ATP?

<p>'Contraction' (D)</p> Signup and view all the answers

What is the function of gap junctions within intercalated discs in cardiac muscle tissue?

<p>Facilitate rapid electrical communication between neighboring cells (C)</p> Signup and view all the answers

Where are Purkinje fibers primarily located in the heart?

<p>Ventricles (lower chambers of the heart) (C)</p> Signup and view all the answers

What is the main role of desmosomes in intercalated discs?

<p>Provide adhesion between adjacent cells during contraction (A)</p> Signup and view all the answers

How are Purkinje fibers described in terms of their function?

<p>Electrical conductors (C)</p> Signup and view all the answers

Which type of tissue makes up Purkinje fibers?

<p>Specialized muscle cells (A)</p> Signup and view all the answers

What is the primary function of Purkinje fibers in cardiac muscle?

<p>Conduct electrical signals (C)</p> Signup and view all the answers

What is the core of sarcomere shortening?

<p>Interaction between actin and myosin proteins (A)</p> Signup and view all the answers

What happens to the I band and H zone during muscle contraction?

<p>They narrow and eventually disappear (D)</p> Signup and view all the answers

Where are the myosin heads attached during filament sliding?

<p>To the thin filaments (A)</p> Signup and view all the answers

What remains relatively constant in length during muscle contraction?

<p>A band (A)</p> Signup and view all the answers

What leads to the shortening of the entire muscle fibre?

<p>Sliding of sarcomeres (C)</p> Signup and view all the answers

How do Z discs change position during muscle contraction?

<p>They come closer together (D)</p> Signup and view all the answers

Where are bipolar neurons commonly found?

<p>Retina of the eyes (B)</p> Signup and view all the answers

What is the main function of bipolar neurons?

<p>Relaying sensory information (B)</p> Signup and view all the answers

What is a key characteristic of unipolar neurons?

<p>They act as sensory specialists (C)</p> Signup and view all the answers

How do unipolar neurons differ from bipolar neurons in terms of structure?

<p>Unipolar neurons have a continuous dendritic and axon cable (A)</p> Signup and view all the answers

Which part of a neuron coordinates its activities?

<p>Cell body (soma) (D)</p> Signup and view all the answers

What differentiates unipolar neurons from bipolar neurons in terms of their length?

<p>Bipolar neurons are long-distance runners (A)</p> Signup and view all the answers

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