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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Read the Support and Movement notesFree MDCAT chapter notes with key terms738 questions · page 25 of 37
- A. Haemoglobin
- B. Actin
- C. Myoglobin
- D. Myosin
Explanation: Myosin is the protein that constitutes the thick filaments in a myofibril.
Correct answer: Myosin- A. Sarcolemma
- B. Sarcoplasm
- C. Plasma membrane
- D. Myofibrils
Explanation: The sarcolemma is the specialized cell membrane of a muscle fiber (muscle cell).
Correct answer: Sarcolemma- A. Actin
- B. Myosin
- C. Troponin
- D. Tropomyosin
Explanation: Actin is a protein that makes up the thin filaments in muscle fibers. Actin is composed of globular monomers known as G-actin (globular…
Correct answer: Actin- A. Actin
- B. Myosin
- C. Troponin
- D. Tropomyosin
Explanation: Actin has 2 polypeptide chains. Myosin has 6 polypetides. Tropomyosin has 2 polypeptides. Troponin has 3 chains.
Correct answer: Troponin- A. Troponin and tropomyosin
- B. Actin filaments and myosin heads
- C. Calcium and sodium
- D. Sarcolemma and sarcoplasmic reticulum
Explanation: Cross bridges form between actin filaments and myosin heads. During muscle contraction, myosin heads attach to binding sites on actin…
Correct answer: Actin filaments and myosin heads- A. Tropomyosin
- B. Tubulin
- C. Troponin
- D. Sarcomere
Explanation: When a muscle is at rest, tropomyosin is a regulatory protein that covers the myosin-binding sites on the actin filament.
Correct answer: Tropomyosin- A. I band shortens
- B. A band remains unchanged
- C. Z-lines get closer
- D. M-line disappears
Explanation: During muscle contraction, I-Band shortens, Z-lines get closer to each other and H-zone disappears. A-Band and M-line remain unchanged.
Correct answer: M-line disappears- A. Actin
- B. Myosin
- C. Troponin
- D. Tropomyosin
Explanation: Myosin is a contractile protein found in muscle cells, and it contains ATPase activity.
Correct answer: Myosin- A. Formation of actin-myosin cross bridges
- B. An action potential
- C. Sarcomere contraction
- D. An increase in calcium ion concentration
Explanation: An action potential, which is an electrical signal generated by nerve cells, triggers the release of calcium ions from the sarcoplasmic…
Correct answer: An action potential- A. I-bands shorten
- B. Z-lines move further apart
- C. H-zone becomes more visible
- D. A-bands shorten
Explanation: According to sliding filament model of muscle contraction, the following changes can occur Z-lines come brought closer together.I-band…
Correct answer: I-bands shorten- A. All the muscle fibers within a given muscle
- B. A motor neuron and the muscle fibers it innervates
- C. All the neurons going into an individual section of a body
- D. A fascicle and a nerve
Explanation: A motor unit is indeed composed of a motor neuron and all the muscle fibers it innervates (connects to).
Correct answer: A motor neuron and the muscle fibers it innervates- A. ATP
- B. Phosphocreatine
- C. Fatty acids
- D. Glycogen
Explanation: ATP is the immediate source of energy for muscle contraction. Adenosine triphosphate (ATP) is a molecule found in cells that serves as a…
Correct answer: ATP- A. Overlapping
- B. Shortening
- C. Lengthening
- D. Contraction
Explanation: During muscle contraction, the thick (myosin) and thin (actin) filaments undergo overlapping.
Correct answer: Overlapping- A. Smooth muscles
- B. Skeletal muscles
- C. Cardiac muscles
- D. Involuntary muscles
Explanation: Skeletal muscles are the muscles that are attached to the skeleton through tendons.
Correct answer: Skeletal muscles- A. Ligament
- B. Belly
- C. Tendon
- D. Smooth muscle
Explanation: Option C is correct. A tendon is a bundle of collagen fibers that attach muscle to bone.
Correct answer: Tendon- A. Muscle fibre
- B. Cardiac fibre
- C. Muscle bundles
- D. Myofilament
Explanation: Option A is correct.A muscle fiber is a long, cylindrical cell that is the basic unit of skeletal muscle tissue.
Correct answer: Muscle fibre- A. Large amount of stored starch
- B. A unique oxygen binding protein, myoglobin
- C. Hemoglobin that stores oxygen
- D. Large amount of stored lipids
Explanation: Option B is correct.Myoglobin is an oxygen-binding protein that is found in the sarcoplasm of muscle fibers.
Correct answer: A unique oxygen binding protein, myoglobin- A. Muscle bundle
- B. Tendon
- C. Muscle fibre or muscle cell
- D. Myofilament
Explanation: Option B is correct.Myofibrils are long, cylindrical structures that run parallel to each other in the muscle fiber.
Correct answer: Muscle fibre or muscle cell- A. Neurolemma
- B. Nuclear membrane
- C. Sarcoplasmic reticulum
- D. Muscle cell membrane or sarcolemma
Explanation: Option D is correct.The muscle cell membrane is also known as the sarcolemma. It is the plasma membrane that surrounds a muscle fiber.
Correct answer: Muscle cell membrane or sarcolemma- A. H band
- B. A band
- C. I band
- D. M band
Explanation: Option C is correct.The light band of a sarcomere is called the I band.
Correct answer: I band