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. Gliding joint
- B. Ball and socket joint
- C. Pivot joint
- D. Hinge joint
Explanation: The hip joint allows movement in all directions, including rotation. This wide range of motion is characteristic of a ball and socket…
Correct answer: Ball and socket joint- A. Disappear
- B. Reduce in size
- C. Lengthen in size
- D. Not change in size
Explanation: The A-band in a sarcomere corresponds to the length of the thick myosin filaments.
Correct answer: Not change in size- A. Unblock the binding sites of actin
- B. Conduct nerve impulse into the cell
- C. Synthesise glycogen in the sarcoplasm
- D. Store calcium ions in the sarcoplasmic reticulum
Explanation: The correct answer is that T-tubules conduct nerve impulses into the muscle cell.
Correct answer: Conduct nerve impulse into the cell- A. Myosin, actin and ATP
- B. Actin, tropomyosin and ATP
- C. Actin, tropomyosin and calcium ions
- D. Myosin, tropomyosin and calcium ions
Explanation: The correct answer is that troponin has binding sites for actin, tropomyosin, and calcium ions.
Correct answer: Actin, tropomyosin and calcium ions- A. Provide ATP
- B. Release calcium ions
- C. Allow acetylcholine to bind with myofibril
- D. Conduct impulses from the neuron down into the myofibril
Explanation: The correct answer is that structure X conducts impulses from the neuron down into the myofibril.
Correct answer: Conduct impulses from the neuron down into the myofibril- A. I band is short
- B. A band is short
- C. H zone is visible
- D. Z lines are visible
Explanation: The H zone is visible when the muscle is relaxed and becomes less visible or disappears during contraction.
Correct answer: H zone is visible- A. Glucose
- B. GTP
- C. ATP
- D. Creatine phosphate
Explanation: ATP is the immediate source of energy for muscle contraction. When ATP is hydrolyzed to ADP (adenosine diphosphate) and inorganic…
Correct answer: ATP- A. Actin
- B. Myosin
- C. Troponin
- D. Tropomyosin
- E. ATP
Explanation: Troponin is a complex of three proteins that are involved in muscle contraction.
Correct answer: Troponin- A. H-band
- B. A-band
- C. Z-line
- D. I-band
Explanation: The light band, which is also called the 'I' band, is isotropic. 'I' stands for isotropic because, in a polarising microscope, these bands…
Correct answer: I-band- A. Actin filaments are only found in the I band
- B. The sarcomeres contribute to the striated appearance of smooth muscle cells
- C. Sarcomeres are functional units of skeletal and smooth muscle cells
- D. The A band contains both actin and myosin filaments
Explanation: Parts of the A band contain both thick and thin filaments, so both myosin and actin filaments are present.
Correct answer: The A band contains both actin and myosin filaments- A. Myosin
- B. Collagen
- C. Sodium ions
- D. Calcium ions
Explanation: The correct answer is option D. The troponin complex consists of three subunits: one binds to actin, another to tropomyosin, and the third…
Correct answer: Calcium ions172. The smallest contractile unit of muscle contraction, called a sarcomere, is the area between two?
- A. H zone
- B. M line
- C. Z line
- D. Z zone
Explanation: The correct answer is the Z line. The sarcomere is the basic contractile unit of muscle fibers and is defined by the area between two Z…
Correct answer: Z line- A. I band
- B. A band
- C. M band
- D. Z band
Explanation: The myosin and actin filaments overlap in peripheral regions of the A band, whereas a middle region (called the H zone) contains only…
Correct answer: A band- A. No action potential will be produced in the affected muscle fibres.
- B. The endoplasmic reticulum releases calcium ions (Ca2++) into the cytoplasm.
- C. Myosin will bind to actin in the affected muscle fibre.
- D. The affected muscle fibre will contract.
Explanation: Acetylcholine is a vital neurotransmitter at the neuromuscular junction, responsible for starting the cascade of events leading to muscle…
Correct answer: No action potential will be produced in the affected muscle fibres.- A. Motor neurons send electrical signals to muscles
- B. Troponin binds calcium
- C. Calcium is released from intracellular storage sites
- D. None of these
Explanation: Option A: Motor neurons are covered with ion channels, which open in response to electrical signals from the brain.
Correct answer: None of these- A. Exposed binding sites on actin
- B. Broad H-zone in sarcomere
- C. Formation of cross bridges
- D. Ca²⁺ released in cytosol
Explanation: In the relaxed state of a muscle:Exposed binding sites on actin: This is incorrect.
Correct answer: Broad H-zone in sarcomere- A. Tropomyosin
- B. Sarcolemma
- C. Cytosol's ions
- D. Troponin
Explanation: Calcium ions, which are released, bind to troponin, which in turn allows the tropomyosin to give way, thus allowing the muscle to stay…
Correct answer: Troponin- A. Glucose
- B. Phosphocreatine
- C. Fructose
- D. Lactic acid
Explanation: After glucose, Phosphocreatine serves as a secondary source of energy.
Correct answer: Phosphocreatine- A. Striations and branched fibres
- B. Striations and unbranched fibres
- C. Multiple nuclei and unbranched fibres
- D. Multiple nuclei and branched fibres
Explanation: The correct answer is Option A: 'striations and branched fibres.' Cardiac muscle tissue is distinct for its striated appearance and…
Correct answer: Striations and branched fibres- A. Skin
- B. Heart
- C. Forelimb
- D. Urinary bladder
Explanation: The correct answer is the urinary bladder. Smooth muscle is found in the walls of hollow organs such as the urinary bladder, where it…
Correct answer: Urinary bladder