Physiology of Smooth Muscle Control

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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?

The mechanism of muscle contraction (B) Signup and view all the answers

What is a commonality between smooth muscle and skeletal muscle?

Both require calcium ions for contraction (A) Signup and view all the answers

What triggers the contraction of most smooth muscle?

An increase in intracellular calcium ions (A) Signup and view all the answers

What is the primary stimulus for skeletal muscle contraction?

An increase in intracellular calcium ions (A) Signup and view all the answers

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

It triggers muscle contraction (C) Signup and view all the answers

What is similar between skeletal muscle and smooth muscle contraction?

The initiating stimulus (D) Signup and view all the answers

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

To initiate muscle contraction (B) Signup and view all the answers

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

Unitary smooth muscle (C) Signup and view all the answers

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

Non-nervous stimuli (D) Signup and view all the answers

What is a characteristic of unitary smooth muscle control?

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

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

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

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

Control by non-nervous stimuli (C) Signup and view all the answers

What happens when the regulatory chain is phosphorylated?

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

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

Muscle contraction (C) Signup and view all the answers

What is the role of myosin phosphatase?

Cessation of muscle contraction (A) Signup and view all the answers

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

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

What happens to the actin filament during muscle contraction?

It is repetitively bound by the head (D) Signup and view all the answers

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

It remains large (D) Signup and view all the answers

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

It remains large (C) Signup and view all the answers

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

It is consistent (C) Signup and view all the answers

What can be inferred about the actin filament?

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

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

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