Chapter 9: Locomotion and Movement — Online MCQ Test
ZOOLOGY · CLASS 11th · Tamil Nadu State Board
Practice Chapter 9: Locomotion and Movement with a free chapter-wise online MCQ test.
This chapter covers: This chapter covers muscle types skeletal muscle structure sliding filament theory and skeletal system architecture. Students study joints bone articulations and muscular-skeletal....
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Chapter 9: Locomotion and Movement — Important Questions & Answers
Which type of muscle is found in the walls of internal organs like the stomach and intestine?
- A. Skeletal muscle
- B. Smooth muscle
- C. Cardiac muscle
- D. Striated muscle
Answer: B. Smooth muscle
Smooth muscles are non-striated, involuntary muscles located in the walls of hollow visceral organs.
Smooth muscles are non-striated, involuntary muscles located in the walls of hollow visceral organs.
The functional unit of contraction in a skeletal muscle is called a:
- A. Sarcomere
- B. Myofibril
- C. Sarcolemma
- D. Sarcoplasm
Answer: A. Sarcomere
A sarcomere is the segment between two Z-lines and is the basic contractile unit of a muscle fiber.
A sarcomere is the segment between two Z-lines and is the basic contractile unit of a muscle fiber.
During muscle contraction, which of the following bands remains unchanged in length?
- A. I-band
- B. H-zone
- C. A-band
- D. Sarcomere
Answer: C. A-band
The A-band contains thick filaments (myosin) and does not change in length during contraction.
The A-band contains thick filaments (myosin) and does not change in length during contraction.
Compare the skeletal structure of an arm and a leg; which bone is analogous to the humerus?
- A. Fibula
- B. Tibia
- C. Femur
- D. Radius
Answer: C. Femur
The femur is the single bone in the thigh, analogous to the humerus in the upper arm.
The femur is the single bone in the thigh, analogous to the humerus in the upper arm.
During strenuous exercise, why do muscles experience fatigue?
- A. Depletion of ATP and accumulation of lactic acid
- B. Excessive intake of calcium ions
- C. Destruction of myosin filaments
- D. Increased glycogen storage in muscles
Answer: A. Depletion of ATP and accumulation of lactic acid
Anaerobic respiration produces lactic acid, which lowers pH and interferes with enzyme activity, causing fatigue.
Anaerobic respiration produces lactic acid, which lowers pH and interferes with enzyme activity, causing fatigue.