25 Questions
What is the primary difference between smooth muscle and skeletal muscle?
The physical organization of the muscle
What is involved in the control of the contractile process in muscles?
Calcium ions
What is a characteristic of smooth muscle compared to skeletal muscle?
Shorter duration of contraction
What is a key difference between smooth muscle and skeletal muscle in terms of excitation-contraction coupling?
The mechanism of muscle contraction
What is a commonality between smooth muscle and skeletal muscle?
Both require calcium ions for contraction
What triggers the contraction of most smooth muscle?
An increase in intracellular calcium ions
What is the primary stimulus for skeletal muscle contraction?
An increase in intracellular calcium ions
What is the effect of an increase in intracellular calcium ions on smooth muscle?
It triggers muscle contraction
What is similar between skeletal muscle and smooth muscle contraction?
The initiating stimulus
What is the role of calcium ions in smooth muscle contraction?
To initiate muscle contraction
What kind of muscle is being referred to in the passage?
Unitary smooth muscle
What type of stimuli plays a significant role in controlling unitary smooth muscle?
Non-nervous stimuli
What is a characteristic of unitary smooth muscle control?
Major control by non-nervous stimuli
What can be said about the control of unitary smooth muscle?
It is primarily controlled by non-nervous stimuli
What is the primary characteristic of unitary smooth muscle control mentioned in the passage?
Control by non-nervous stimuli
What happens when the regulatory chain is phosphorylated?
The head has the capability of binding repetitively with the actin filament
What is the result of the repetitive binding of the head with actin filament?
Muscle contraction
What is the role of myosin phosphatase?
Cessation of muscle contraction
What is similar between the muscle contraction in phosphorylated regulatory chain and skeletal muscle?
The entire cycling process of intermittent 'pulls'
What happens to the actin filament during muscle contraction?
It is repetitively bound by the head
What can be said about the number of heads attached to the actin filament at any given time?
It remains large
What happens to the number of heads attached to the actin filament?
It remains large
What is the characteristic of the number of heads attached to the actin filament?
It is consistent
What can be inferred about the actin filament?
It has a large number of heads attached at any given time
What is true about the heads attached to the actin filament?
They are numerous at any given time
This quiz covers the non-nervous stimuli that control unitary smooth muscle, an essential aspect of physiology. Test your understanding of the mechanisms involved. Compare your knowledge with others!
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