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Which type of muscle tissue is found in the walls of the stomach and intestine and is involuntary in nature?
Striated muscle
Cardiac muscle
Smooth muscle
Skeletal muscle
Smooth muscle
Smooth muscles (also known as non-striated or involuntary muscles) are specialized tissues located in the walls of hollow internal organs such as the stomach, intestines, blood vessels, and bladder. They are characterized by a lack of visible striations under a microscope and function independently of conscious control.
Smooth muscles (also known as non-striated or involuntary muscles) are specialized tissues located in the walls of hollow internal organs such as the stomach, intestines, blood vessels, and bladder. They are characterized by a lack of visible striations under a microscope and function independently of conscious control.
Think of smooth muscle as an 'autopilot' system; just as you don't need to manually tell your car's engine to keep pumping fuel, you don't need to consciously remind your stomach to churn your lunch.
SM-I: Smooth Muscles are Involuntary.
F=ma тАФ relates force to mass and acceleration of organ contents
╬ФP=P1тАЛтИТP2тАЛ тАФ represents pressure gradients generated by smooth muscle contraction in tubular organs
The contraction of smooth muscle is triggered by the sliding filament mechanism involving actin and myosin proteins, similar to striated muscle, but arranged differently in a non-linear network. These cells are activated by the autonomic nervous system, hormones, or local chemical signals, leading to sustained, slow, and rhythmic contractions known as peristalsis.
Smooth muscles are spindle-shaped (fusiform) cells with a single central nucleus.
They do not show alternating light and dark bands (striations) under a microscope.
They are capable of slow, sustained contractions and are fatigue-resistant.
Regulation is via the Autonomic Nervous System (ANS) and endocrine factors.
Energy-efficient (can maintain tension for long periods without consuming excessive ATP).
Provides rhythmic propulsion (peristalsis) essential for digestion and circulation.
Incapable of the rapid, powerful bursts of contraction found in skeletal muscles.
Regulation of blood flow through vasoconstriction and vasodilation.
Movement of food bolus through the gastrointestinal tract.
The process of wave-like contraction moving material through the digestive tract is called peristalsis.
Option A (Striated muscle) refers to skeletal muscle which is voluntary.
Option B (Cardiac muscle) is involuntary but uniquely striated and found only in the heart.
Option D (Skeletal muscle) is voluntary and attached to bones for locomotion.
C is correct тАФ Smooth muscle tissue is involuntary and forms the walls of hollow organs like the stomach and intestine.
Always link muscle types to their specific location: Striated=Bones, Cardiac=Heart, Smooth=Visceral/Hollow organs.