Upper oesophageal sphincter is made up of_ and lower oesophageal sphincter of _.

skeletal muscles and smooth muscles

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Smooth muscle and cardiac muscles

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Structural muscles and skeletal muscles

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Cardiac muscles and smooth muscles

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Solution

The correct option is A
skeletal muscles and smooth muscles

Skeletal muscleis a form of striatedmuscle tissue which is under the voluntary control of the somatic nervous system. Upper oesophageal sphincter basically acts under voluntary action whereas smooth muscle is responsible for the contractility of hollow organs, such as blood vessels, the gastrointestinal tract, thebladder, or theuterus.

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Question 20
The muscular tissue which functions throughout the life continuously without fatigue is

(a) Skeletal muscle
(b) Cardiac muscle
(c) Smooth muscle
(d) Voluntary muscle

Q. Read the following statements carefully and select the correct ones.
(i) Cardiac fibres are branched with multiple nuclei
(ii) Smooth muscles are unbranched and cylindrical
(iii) Skeletal muscles can be branched or unbranched
(iv) Smooth muscles are non-striated

Q. Differentiate between skeletal and smooth muscles.

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Upper oesophageal sphincter is made up of___ and lower oesophageal sphincter of ___.

Upper oesophageal sphincter is made up of_ and lower oesophageal sphincter of _.