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Standard IX
Biology
Unstraited/Smooth Muscles
Multi-unit sm...
Question
Multi-unit smooth muscles are present in:
A
Heart
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B
Blood vessel
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C
Urinary bladder
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D
GI tract
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Solution
The correct option is
B
Blood vessel
.
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Multi unit muscle fibres are found in the:
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Read the following statements regarding different types of animals tissues and select the incorrect ones.
(i) Each fasciculus (or bundle of muscle fibres) is surrounded by an epithelial tissue covering called perimysium
(ii) Multi unit smooth muscles are present in ciliary and iris muscles in the eyes and muscles of the walls of large blood vessels.
(iii) Columnar epithelium present in gastric glands, intestinal glands and pancreatic lobules, has a secretory role and is called as glandular epithelium.
(iv) Epithelial tissue arises only from the ectoderm of embryo and is usually supplied with blood vessels
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Study the following and identify the incorrect statements.
(I) Muscles of the iris and ciliary body are the smooth muscles of mesodermal origin
(II) Slow and sustained involuntary contractions of smooth muscles are called spasms.
(III) Quiescent mononucleate myogenic cells of skeletal muscles are called pericytes.
(IV) The skeletal muscle fibre is multi nucleate and is a syncitium.
Q.
Which type of muscles are present in the abdominal wall?
(1)smooth muscle
(2)striated muscle
(3)both of these
(4)none of these
Q.
Largest smooth muscle is present in _____________.
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