Physiology of Smooth Muscle Control
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Questions and Answers

What is the primary difference between smooth muscle and skeletal muscle?

  • The physical organization of the muscle (correct)
  • The duration of muscle relaxation
  • The type of calcium ions used for contraction
  • The amount of energy required for contraction

What is involved in the control of the contractile process in muscles?

  • Magnesium ions
  • Sodium ions
  • Potassium ions
  • Calcium ions (correct)

What is a characteristic of smooth muscle compared to skeletal muscle?

  • Less energy required for contraction
  • Longer duration of contraction
  • More energy required for contraction
  • Shorter duration of contraction (correct)

What is a key difference between smooth muscle and skeletal muscle in terms of excitation-contraction coupling?

<p>The mechanism of muscle contraction (B)</p> Signup and view all the answers

What is a commonality between smooth muscle and skeletal muscle?

<p>Both require calcium ions for contraction (A)</p> Signup and view all the answers

What triggers the contraction of most smooth muscle?

<p>An increase in intracellular calcium ions (A)</p> Signup and view all the answers

What is the primary stimulus for skeletal muscle contraction?

<p>An increase in intracellular calcium ions (A)</p> Signup and view all the answers

What is the effect of an increase in intracellular calcium ions on smooth muscle?

<p>It triggers muscle contraction (C)</p> Signup and view all the answers

What is similar between skeletal muscle and smooth muscle contraction?

<p>The initiating stimulus (D)</p> Signup and view all the answers

What is the role of calcium ions in smooth muscle contraction?

<p>To initiate muscle contraction (B)</p> Signup and view all the answers

What kind of muscle is being referred to in the passage?

<p>Unitary smooth muscle (C)</p> Signup and view all the answers

What type of stimuli plays a significant role in controlling unitary smooth muscle?

<p>Non-nervous stimuli (D)</p> Signup and view all the answers

What is a characteristic of unitary smooth muscle control?

<p>Major control by non-nervous stimuli (B)</p> Signup and view all the answers

What can be said about the control of unitary smooth muscle?

<p>It is primarily controlled by non-nervous stimuli (B)</p> Signup and view all the answers

What is the primary characteristic of unitary smooth muscle control mentioned in the passage?

<p>Control by non-nervous stimuli (C)</p> Signup and view all the answers

What happens when the regulatory chain is phosphorylated?

<p>The head has the capability of binding repetitively with the actin filament (A)</p> Signup and view all the answers

What is the result of the repetitive binding of the head with actin filament?

<p>Muscle contraction (C)</p> Signup and view all the answers

What is the role of myosin phosphatase?

<p>Cessation of muscle contraction (A)</p> Signup and view all the answers

What is similar between the muscle contraction in phosphorylated regulatory chain and skeletal muscle?

<p>The entire cycling process of intermittent 'pulls' (B)</p> Signup and view all the answers

What happens to the actin filament during muscle contraction?

<p>It is repetitively bound by the head (D)</p> Signup and view all the answers

What can be said about the number of heads attached to the actin filament at any given time?

<p>It remains large (D)</p> Signup and view all the answers

What happens to the number of heads attached to the actin filament?

<p>It remains large (C)</p> Signup and view all the answers

What is the characteristic of the number of heads attached to the actin filament?

<p>It is consistent (C)</p> Signup and view all the answers

What can be inferred about the actin filament?

<p>It has a large number of heads attached at any given time (D)</p> Signup and view all the answers

What is true about the heads attached to the actin filament?

<p>They are numerous at any given time (A)</p> Signup and view all the answers

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