Free Support and Movement MCQs with Answers
738 Support and Movement MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Support and movement covers the axial and appendicular skeleton, bone structure, joints and the arrangement of skeletal muscles. Muscle contraction is explained through actin, myosin, sliding filaments, calcium ions and ATP, while arthritis is distinguished as a disorder of joints rather than a normal part of movement.
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- A. Strength
- B. Nourishment
- C. Striped appearance
- D. Protection
Explanation: Option C is correct.The light and dark bands of muscle cells give the muscle cell as a whole its striated appearance.
Correct answer: Striped appearance502. Myofibrils contain:
- A. Tendons and ligaments
- B. Thick filaments
- C. Thin filaments
- D. Both B and C
Explanation: Option D is correct. Myofibrils are the contractile units of muscle fibers. They are made up of repeating units called sarcomeres.
Correct answer: Both B and C- A. Myofibril
- B. Muscle fibre
- C. Muscle bundle
- D. Myoglobin
Explanation: Option A is correct. Myofibrils are the contractile units of muscle fibers. They are made up of repeating units called sarcomeres.
Correct answer: Myofibril- A. 16 µm
- B. 7-8 nm
- C. 1-2 µm
- D. 16 nm
Explanation: Option D is correct.Yes, the diameter of a thick filament in a sarcomere is about 16 nanometers.
Correct answer: 16 nm- A. Two globular heads
- B. Two linear heads
- C. A globular head
- D. A linear head
Explanation: Option A is correct.Each myosin molecule has a long, rod-shaped tail that is made up of two myosin-heavy chains.
Correct answer: Two globular heads- A. Cross Fibres
- B. Cross bridges
- C. Cross connection
- D. Both B and C
Explanation: Option D is correct. The globular heads of myosin filaments link the thick and the thin myofilaments together during muscle contraction.
Correct answer: Both B and C- A. 1-2 µm
- B. 10-60 µm
- C. 7-8 nm
- D. 16 nm
Explanation: Option C is correct.The diameter of a thin filament in a sarcomere is about 7-8 nanometers.
Correct answer: 7-8 nm- A. Actin
- B. Troponin
- C. Tropomyosin
- D. Myosin
Explanation: Option A is correct.Thin filaments are composed chiefly of actin. Actin is a protein that makes up the thin filaments of muscle cells.
Correct answer: Actin- A. Myosin filament
- B. Binding sites of myosin filament
- C. Binding sites on actin filament
- D. Actin filament
Explanation: Myosin heads bind to the binding sites on actin filaments to make cross bridges.
Correct answer: Binding sites on actin filament- A. Extend
- B. Move slightly
- C. Contract
- D. Remain in the same position
Explanation: When the muscle is required to contract, calcium ions bind with troponin molecule and cause them to move slightly.This has the effect of…
Correct answer: Move slightly- A. ATP is synthesized and the bridge goes to its cycle
- B. ATP is hydrolyzed and the bridge goes to its cycle
- C. ATP is synthesized and the bridge becomes fixed
- D. ATP is hydrolyzed and the bridge becomes fixed
Explanation: Muscle contraction is a highly active process and ATPs are consumed at each step i.e.
Correct answer: ATP is hydrolyzed and the bridge goes to its cycle- A. One after other
- B. Simultaneously
- C. Separately
- D. Now or then simultaneously
Explanation: The contraction of each muscle fiber is based on the "All or none" principle i.e. all of its fibrils participate in contraction.
Correct answer: Simultaneously- A. Z-line
- B. A and I junction
- C. Z-line or A and I Junctions
- D. M-line or A and I Junctions
Explanation: It is to ensure the transmission of impulse.
Correct answer: Z-line or A and I Junctions- A. Accumulation of ATPs
- B. Aerobic breakdown of glucose
- C. Overactive metabolism
- D. Lactic acid accumulation
Explanation: It accumulates as a result of anaerobic respiration and accumulation of acid lowers the pH
Correct answer: Lactic acid accumulation- A. Cramp
- B. Muscle fatigue
- C. Tetany
- D. Tetanus
Explanation: Tetany has symptoms that involve involuntary muscle contractions and overly stimulated peripheral nerves.
Correct answer: Tetany- A. Two
- B. Four
- C. Three
- D. Six
Explanation: Vertebrates possess 3 kinds of muscles; Skeletal, smooth, and cardiac.
Correct answer: Three- A. Smooth muscles
- B. Skeletal muscles
- C. Voluntary muscles
- D. Involuntary muscles
Explanation: Skeletal muscles have regular striations or strips converting the surface into alternating light and dark bands.
Correct answer: Skeletal muscles- A. Smooth muscles
- B. Cardiac muscles
- C. Skeletal muscles
- D. Involuntary muscles
Explanation: Skeletal muscle cells are multinucleate.
Correct answer: Skeletal muscles- A. Spontaneous stimuli
- B. Nervous system & hormonal stimuli
- C. Stretch stimuli
- D. Spontaneous, stretch, nervous & hormones
Explanation: Causes of contraction of smooth muscles are diverse.
Correct answer: Spontaneous, stretch, nervous & hormones- A. Spontaneous stimuli
- B. Nervous stimuli
- C. Stretch stimuli
- D. Hormonal stimuli
Explanation: Cardiac muscles are myogenic and the stimulus is generated by the SA node spontaneously.
Correct answer: Spontaneous stimuli