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 13 of 37
- A. Intestinal muscles
- B. Triceps
- C. Biceps
- D. Triceps and biceps
Explanation: The striated appearance of skeletal muscle tissue is a result of repeating bands of the proteins actin and myosin that are present along…
Correct answer: Triceps and biceps- A. Myosin only
- B. Actin only
- C. Both actin and myosin
- D. Actin, myosin and tropomyosin
Explanation: Actin, Myosin and tropomyosin are the major structural and regulatory proteins present in the skeletal muscles.
Correct answer: Actin, myosin and tropomyosin- A. They are multinucleated.
- B. They are 1-1 nm in diameter and surrounded by sarcolemma.
- C. They contain O2 storing molecules called myoglobin.
- D. Their cytoplasm contains the high concentration of carbohydrates .
Explanation: Skeletal muscle fibres are not 1-1 nm in diameter. They are 10-100 micrometer in diameter and are surrounded by sarcolemma.
Correct answer: They are 1-1 nm in diameter and surrounded by sarcolemma.- A. They are linked together via intercalated discs.
- B. There are gap junctions between cells.
- C. They form branching chains.
- D. They are non-striated.
Explanation: Cardiac muscle (also called heart muscle or myocardium) is one of three types of vertebrate muscle tissue, with the other two being…
Correct answer: They are non-striated.- A. I band
- B. H zone
- C. A band
- D. Z disc
Explanation: Z-discs are the dividing points between sarcomeres. Actin filaments extend from this region and are joined together by several complex…
Correct answer: Z disc- A. Skeletal muscle
- B. Cardiac muscle
- C. Smooth muscle
- D. Both B and C
Explanation: Smooth muscles are uni-nucleated and non-striated. It is composed of small spindle-shaped cells with a single, central nucleus.
Correct answer: Both B and C- A. ATP does all of these things during muscle contraction.
- B. It allows the myosin head to detach from the actin filament.
- C. It moves tropomyosin off of actin binding sites.
- D. Both A and B
Explanation: Energy from ATP is required for the myosin head to release from the actin filament-otherwise the myosin heads would remain in the same…
Correct answer: It allows the myosin head to detach from the actin filament.- A. Striated muscle
- B. Smooth muscle
- C. Cardiac muscle
- D. Skeletal muscle
Explanation: Smooth muscle fibers are nonstriated, spindle-shaped and have 1 nucleus per cell.
Correct answer: Smooth muscle- A. Skeletal: striated, voluntary
- B. Cardiac: striated, involuntary
- C. Cardiac: striated, voluntary
- D. Both B and C
Explanation: Correct Option is C as cardiac muscles are involuntary.
Correct answer: Cardiac: striated, voluntary- A. Actin
- B. Myosin
- C. Troponin
- D. Tropomyosin
Explanation: At high magnification, small bridge-like structures can be seen on the thick filaments (myosin) extending toward the thin filaments…
Correct answer: Myosin- A. Striated and branched
- B. Multinucleated
- C. Self excitatory
- D. None of these
Explanation: Each cardiac myocyte contains a single, centrally located nucleus and is surrounded by a cell membrane known as the sarcolemma.
Correct answer: Multinucleated- A. Regulation of ion concentration
- B. Muscular contraction
- C. Organ and nerve protection
- D. Regulation of pH through hydration
Explanation: Muscular contraction is not a direct function of bones. Muscular contraction is a function of the muscles themselves.
Correct answer: Muscular contraction- A. Two
- B. One
- C. Three
- D. Four
Explanation: The actin molecules contain active sites, to which myosin heads will bind, during contraction.
Correct answer: Two- A. Bind to troponin molecule and cause them to move
- B. Polarize visible light
- C. Aid in the transmission of nerve impulse
- D. Bind to tropomyosin molecule and cause them to form cross bridges
Explanation: Calcium ions play a critical role in muscle contraction by binding to the troponin molecules present on the thin filaments.
Correct answer: Bind to troponin molecule and cause them to move- A. I band
- B. H zone
- C. A band
- D. None of these
Explanation: Even though the 'I band' and the 'H zone' change in length, the 'A band' remains the same in length.
Correct answer: A band256. Which cells secrete flexible, elastic, non-living matrix collagen that surrounds the cartilage?
- A. Osteocytes
- B. Osteoclasts
- C. Chondrocytes
- D. Osteoblasts
Explanation: 'Chondrocytes' are the first chondroblast cells that produce the collagen extracellular matrix (ECM) and then get caught in the matrix.
Correct answer: Chondrocytes- A. Microtubules
- B. Myofibril
- C. Myosin filament
- D. M-line
Explanation: The subunits of a 'myofibril' are sarcomeres.
Correct answer: Myofibril258. Which of the following is the name of the modified endoplasmic reticulum found in muscle cells?
- A. T-tubule
- B. Sarcomere
- C. Myoplasmic reticulum
- D. Sarcoplasmic reticulum
Explanation: The sarcoplasmic reticulum (SR) is a membrane-bound structure found within muscle cells that is similar to the smooth endoplasmic…
Correct answer: Sarcoplasmic reticulum- A. Actin filament
- B. Sarcomere
- C. Both Options A and B are correct
- D. Myosin
Explanation: Option A: Actin filament alone does not shorten during muscle contraction.
Correct answer: Sarcomere- A. Synostosis
- B. Symphysis
- C. Syndesmosis
- D. Interosseous membrane
Explanation: Option A: Synostosis is the union or fusion of adjacent bones by the growth of a bony substance, either as a normal process during growth…
Correct answer: Syndesmosis