The type of muscle found in the walls of the digestive tract is: MCQ with Answer and Explanation

The type of muscle found in the walls of the digestive tract is:
A. Cardiac
B. Skeletal
C. Voluntary
D. Smooth
Answer: Option D
Solution (By JKSSB Mock Tests)
Smooth muscle is non-striated, involuntary, and forms the muscular layer of the digestive tract (esophagus, stomach, intestines), responsible for peristalsis. Skeletal muscle is voluntary and striated, cardiac is heart-specific.

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Practice More Biology Questions

Question #1
Which of the following scientists is credited with the discovery of the 'Krebs cycle' (Citric Acid Cycle)?
A. Arthur Kornberg
B. Melvin Calvin
C. Hans Adolf Krebs
D. Otto Warburg

Correct Answer: Option C


Explanation:
The Krebs cycle, also known as the citric acid cycle or TCA cycle, is the central metabolic pathway for the oxidation of acetyl-CoA to produce energy (ATP, NADH, FADH2). It was discovered by the British-German biochemist Sir Hans Adolf Krebs in 1937. He was awarded the Nobel Prize in Physiology or Medicine in 1953 for this discovery. Melvin Calvin elucidated the carbon pathway in photosynthesis.

This question belongs to: Science Biology
Question #2
The hormone insulin is produced by which cells of the pancreas?
A. Delta cells
B. Alpha cells
C. Acinar cells
D. Beta cells

Correct Answer: Option D


Explanation:
Beta cells of the islets of Langerhans secrete insulin, which lowers blood glucose. Alpha cells secrete glucagon (raises glucose), delta cells somatostatin, and acinar cells produce digestive enzymes.

This question belongs to: Science Biology
Question #3
The enzyme that catalyzes the breakdown of hydrogen peroxide into water and oxygen is:
A. Amylase
B. Catalase
C. Lipase
D. Pepsin

Correct Answer: Option B


Explanation:
Catalase is an antioxidant enzyme found in peroxisomes that efficiently decomposes hydrogen peroxide (a toxic byproduct) into water and oxygen. Lipase digests fats, amylase starch, pepsin proteins.

This question belongs to: Science Biology