Question

Characteristics of smooth muscle fibres are
(a) spindle-shaped, unbranched, unstriated,
uninucleate and involuntary
(b) spindle shaped, unbranched, unstriped,
multinucleate and involuntary
(c) cylindrical, unbranched, unstriped, multinu-
cleate and involuntary
(d) cylindrical, unbranched, striated, multinu-
cleate and voluntary

Answer 1

Answer:

a) spindle shaped, unbranched, unstraight, uninucleated and involuntary

Answer 2

Option (d) is the right answer

Characteristics of smooth muscle fibres are spindle-shaped, unbranched, nonstriated, uninucleate and involuntary.

The specific reasons are mentioned below :

- These kind of muscles don't show any kind of striations when viewed under the microscope.

- These muscles have a single and elongated nucleus.

- They also contain actin contractile filaments (thin) and myosin contractile filaments ( thick).

- These muscles are found in the areas or the walls of organs like stomach , bladder , uterus and gastrointestinal tracts.

- They work involuntarily ,i.e, without our involvement.